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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Hg8Br3O4 by Materials Project

HgHgBrHg4O3BrHg2OBr crystallizes in the monoclinic P2_1/c space group. The structure is two-dimensional and consists of four mercury molecules; four Hg2OBr clusters; two HgBr ribbons oriented in the (0, 1, 0) direction; and two Hg4O3Br sheets oriented in the (0, 0, 1) direction. In each Hg2OBr cluster, there are two inequivalent Hg+1.38+ sites. In the first Hg+1.38+ site, Hg+1.38+ is bonded in a 1-coordinate geometry to one Br1- atom. The Hg–Br bond length is 3.10 Å. In the second Hg+1.38+ site, Hg+1.38+ is bonded in a single-bond geometry to one O2- atom. The Hg–O bond length is 2.29 Å. O2- is bonded in a bent 120 degrees geometry to one Hg+1.38+ and one Br1- atom. The O–Br bond length is 1.79 Å. Br1- is bonded in a distorted L-shaped geometry to one Hg+1.38+ and one O2- atom. In each HgBr ribbon, Hg+1.38+ is bonded in a 2-coordinate geometry to one Hg+1.38+ and two equivalent Br1- atoms. The Hg–Hg bond length is 2.63 Å. There are one shorter (2.55 Å) and one longer (3.14 Å) Hg–Br bond lengths. Br1- is bonded in an L-shaped geometry to two equivalent Hg+1.38+ atoms. In each Hg4O3Br sheet, there are four inequivalent Hg+1.38+ sites. In the first Hg+1.38+ site, Hg+1.38+ is bonded in a distorted linear geometry to two O2- and three equivalent Br1- atoms. Both Hg–O bond lengths are 2.11 Å. There are a spread of Hg–Br bond distances ranging from 3.21–3.27 Å. In the second Hg+1.38+ site, Hg+1.38+ is bonded in a 2-coordinate geometry to two O2- and one Br1- atom. Both Hg–O bond lengths are 2.47 Å. The Hg–Br bond length is 3.02 Å. In the third Hg+1.38+ site, Hg+1.38+ is bonded in a distorted single-bond geometry to one O2- atom. The Hg–O bond length is 2.90 Å. In the fourth Hg+1.38+ site, Hg+1.38+ is bonded to three O2- and one Br1- atom to form distorted corner-sharing HgBrO3 trigonal pyramids. There are a spread of Hg–O bond distances ranging from 2.29–2.34 Å. The Hg–Br bond length is 2.92 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to four Hg+1.38+ atoms to form corner-sharing OHg4 tetrahedra. In the second O2- site, O2- is bonded in a distorted water-like geometry to one Hg+1.38+ and one O2- atom. The O–O bond length is 1.40 Å. In the third O2- site, O2- is bonded in a 4-coordinate geometry to three Hg+1.38+ and one O2- atom. Br1- is bonded in a 5-coordinate geometry to five Hg+1.38+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaHg11 by Materials Project

CaHg11 crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Ca is bonded to twelve Hg atoms to form CaHg12 cuboctahedra that share corners with four equivalent HgHg12 cuboctahedra and corners with eight equivalent CaHg12 cuboctahedra. There are four shorter (3.72 Å) and eight longer (3.77 Å) Ca–Hg bond lengths. There are six inequivalent Hg sites. In the first Hg site, Hg is bonded to twelve Hg atoms to form HgHg12 cuboctahedra that share corners with twelve equivalent CaHg12 cuboctahedra. All Hg–Hg bond lengths are 3.35 Å. In the second Hg site, Hg is bonded in a 6-coordinate geometry to six Hg atoms. There are three shorter (3.05 Å) and three longer (3.09 Å) Hg–Hg bond lengths. In the third Hg site, Hg is bonded in a 10-coordinate geometry to two equivalent Ca and eight Hg atoms. There are two shorter (3.14 Å) and four longer (3.17 Å) Hg–Hg bond lengths. In the fourth Hg site, Hg is bonded in a 10-coordinate geometry to one Ca and nine Hg atoms. All Hg–Hg bond lengths are 3.35 Å. In the fifth Hg site, Hg is bonded in a 10-coordinate geometry to one Ca and nine Hg atoms. All Hg–Hg bond lengths are 3.35 Å. In the sixth Hg site, Hg is bonded in a 10-coordinate geometry to one Ca and nine Hg atoms. The Hg–Ca bond length is 3.72 Å. There are four shorter (3.17 Å) and two longer (3.35 Å) Hg–Hg bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2023

Use of Stable Mercury Isotopes to Assess Mercury and Methylmercury Transformation and Transport across Critical Interfaces from the Molecular to the Watershed Scale (Final Report)

This project titled “Use of Stable Mercury Isotopes to Assess Mercury and Methylmercury Transformation and Transport across Critical Interfaces from the Molecular to the Watershed Scale” represents a collaborative effort between the University of Michigan (Jason Demers, PI) and Oak Ridge National Laboratory (Scott Brooks, co-I). Much has been learned about mercury (Hg) cycling in stream ecosystems, and East Fork Poplar Creek (EFPC) in particular, through decades of previous research. Nevertheless, some of the most fundamental questions regarding the sources of bioavailable Hg and its transformation to toxic methylmercury (MeHg) have remained unanswered. These fundamental questions include: (1) what are the sources and biogeochemical processes that lead to the input of dissolved Hg to stream water across critical subsurface interfaces within stream ecosystems, and EFPC in particular? and (2) what are the sources and biogeochemical processes that control the production and fate of bioaccumulative MeHg within stream ecosystems, and in EFPC in particular? To address these fundamental questions, our project aimed to couple laboratory experiments and field observations, both utilizing natural abundance Hg stable isotope techniques, to identify the processes responsible for generating mobile, bioavailable dissolved Hg from recalcitrant legacy sources within critical subsurface zones (e.g., streambed hyporheic zone, riparian floodplain subsurface). We used the isotopic signature of this bioavailable dissolved Hg to track its mobilization across these critical interfaces in order to link diffuse subsurface sources of dissolved Hg with increases in surface water dissolved Hg flux measured at the watershed scale. Additionally, our research aimed to determine the isotopic composition of MeHg within these same critical subsurface zones. We directly assessed the isotopic composition of MeHg within biota in order to gain insight into which subsurface sources of inorganic Hg and toxic MeHg are available for bioaccumulation within the EFPC ecosystem. Net fluxes of dissolved Hg along the flow path of EFPC were shown to vary spatially and temporally. In the Upper EFPC, within the Y12 boundary, stream water flux of dissolved Hg consistently decreased between the outfall and the downstream boundary of Y12 (57% ± 29%, 1SD). Within the Upper EFPC, an assessment of Hg isotopic composition suggested that losses were strongly reaction-driven, although isotopic diagnostics did not conform to any known processes. Downstream of Y12, in the upper reach of the Lower EFPC, dissolved Hg fluxes tended to increase during the dormant season (net gain of 11-120%), and decrease during the growing season (net loss of 23% +/- 18%, 1SD). In the downstream-most reach of Lower EFPC, dissolved Hg fluxes increased by 12-108% in 9 out of 10 monthly assessments. Overall, diffuse fluxes from the non-Y12 watershed accounted for 34% (+/- 17%, 1SD) of all dissolved Hg exported during base flow. Within Lower EFPC, an assessment of Hg isotopic composition was consistent with the contribution of diffuse Hg inputs from high-concentration hotspots within riparian floodplains and streambed hyporheic pore water. To investigate remobilization of recalcitrant Hg from legacy sediment sources, we developed procedures that coupled isotopic analysis with sequential extractions of streambed sediment. We found that the proportion of weakly-bound Hg within EFPC streambed sediment was relatively small, but could still account for a large proportion of the annual flux of dissolved Hg from EFPC. These sequential extractions also showed that this weakly-bound Hg fraction could be replenished from the much larger fraction of recalcitrant Hg in sediment. The isotopic composition of these weakly-bound and remobilized recalcitrant Hg fractions within the sediment was consistent with high-concentration dissolved Hg hotspots within hyporheic pore water. Thus, this research provided novel evidence that legacy mercury sources within streambed sediment could provide an ongoing contribution of dissolved Hg to surface waters. Finally, we developed new methods for the direct determination of the MeHg isotopic composition of organisms, which allowed a more direct evaluation of inorganic Hg and MeHg sources accumulating in the food web. We found that fish and aquatic invertebrates in both EFPC and a regional background site obtained inorganic Hg and MeHg from multiple isotopically distinct sources, including sediment, suspended particulates, and periphyton. Photodemethylation was found to be an important reaction influencing MeHg dynamics at both sites. However, the balance of microbial methylation and demethylation processes differed between the two streams, with fractionation resulting from methylation and demethylation processes being relatively in balance within the regional background site, whereas microbial methylation appeared to be dominant over microbial demethylation within the EFPC ecosystem. Broadly, the application of Hg isotopic analysis in this study led to numerous novel insights regarding the biogeochemical cycling of Hg in stream ecosystems. This research project promoted the development of two new approaches, including the coupling of sequential extractions with Hg isotopic analysis to assess remobilization of recalcitrant Hg within sediments, and a new method for the isotopic analysis of MeHg isolated from environmental samples. Both of these efforts represent advances in capacity for the field of mercury isotopic analysis and environmental assessment. Overall, this study demonstrates that the application of Hg stable isotope techniques continues to provide new insights into the biogeochemical cycling of Hg in complex aquatic environments, both within the EFPC and beyond.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
DOE OSTI2020

Materials Data on K5Hg7 by Materials Project

K5Hg7 crystallizes in the orthorhombic Pbcm space group. The structure is three-dimensional. there are five inequivalent K sites. In the first K site, K is bonded in a 8-coordinate geometry to eight Hg atoms. There are a spread of K–Hg bond distances ranging from 3.56–3.85 Å. In the second K site, K is bonded in a 8-coordinate geometry to eight Hg atoms. There are a spread of K–Hg bond distances ranging from 3.70–3.78 Å. In the third K site, K is bonded in a 2-coordinate geometry to eight Hg atoms. There are a spread of K–Hg bond distances ranging from 3.56–3.93 Å. In the fourth K site, K is bonded in a 8-coordinate geometry to twelve Hg atoms. There are a spread of K–Hg bond distances ranging from 3.70–4.06 Å. In the fifth K site, K is bonded in a 10-coordinate geometry to ten Hg atoms. There are a spread of K–Hg bond distances ranging from 3.58–3.81 Å. There are four inequivalent Hg sites. In the first Hg site, Hg is bonded in a 10-coordinate geometry to seven K and three Hg atoms. There are a spread of Hg–Hg bond distances ranging from 3.10–3.19 Å. In the second Hg site, Hg is bonded in a 10-coordinate geometry to eight K and two equivalent Hg atoms. Both Hg–Hg bond lengths are 3.33 Å. In the third Hg site, Hg is bonded in a 1-coordinate geometry to six K and three Hg atoms. There are one shorter (3.12 Å) and one longer (3.23 Å) Hg–Hg bond lengths. In the fourth Hg site, Hg is bonded in a 10-coordinate geometry to six K and four Hg atoms. The Hg–Hg bond length is 3.09 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cs2Hg27 by Materials Project

(Cs3Hg40)2Hg crystallizes in the cubic Im-3 space group. The structure is three-dimensional and consists of two mercury molecules and one Cs3Hg40 framework. In the Cs3Hg40 framework, Cs is bonded in a 4-coordinate geometry to twenty Hg atoms. There are a spread of Cs–Hg bond distances ranging from 4.02–4.37 Å. There are six inequivalent Hg sites. In the first Hg site, Hg is bonded in a 9-coordinate geometry to three equivalent Cs and six Hg atoms. There are a spread of Hg–Hg bond distances ranging from 3.10–3.33 Å. In the second Hg site, Hg is bonded in a 4-coordinate geometry to two equivalent Cs and six Hg atoms. There are a spread of Hg–Hg bond distances ranging from 3.10–3.42 Å. In the third Hg site, Hg is bonded in a 6-coordinate geometry to six Hg atoms. There are a spread of Hg–Hg bond distances ranging from 3.30–3.39 Å. In the fourth Hg site, Hg is bonded in a 9-coordinate geometry to one Cs and eight Hg atoms. Both Hg–Hg bond lengths are 3.42 Å. In the fifth Hg site, Hg is bonded in a 9-coordinate geometry to two equivalent Cs and seven Hg atoms. There are one shorter (3.18 Å) and two longer (3.23 Å) Hg–Hg bond lengths. In the sixth Hg site, Hg is bonded in a 6-coordinate geometry to six Hg atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BaHg6 by Materials Project

BaHg6 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Ba is bonded in a 8-coordinate geometry to sixteen Hg atoms. There are a spread of Ba–Hg bond distances ranging from 3.63–3.96 Å. There are six inequivalent Hg sites. In the first Hg site, Hg is bonded in a 6-coordinate geometry to three equivalent Ba and three Hg atoms. There are a spread of Hg–Hg bond distances ranging from 2.97–2.99 Å. In the second Hg site, Hg is bonded in a 8-coordinate geometry to three equivalent Ba and five Hg atoms. There are a spread of Hg–Hg bond distances ranging from 3.00–3.14 Å. In the third Hg site, Hg is bonded in a 8-coordinate geometry to three equivalent Ba and five Hg atoms. There are a spread of Hg–Hg bond distances ranging from 3.11–3.26 Å. In the fourth Hg site, Hg is bonded in a 8-coordinate geometry to three equivalent Ba and five Hg atoms. The Hg–Hg bond length is 3.02 Å. In the fifth Hg site, Hg is bonded in a 7-coordinate geometry to two equivalent Ba and five Hg atoms. The Hg–Hg bond length is 3.05 Å. In the sixth Hg site, Hg is bonded in a distorted pentagonal planar geometry to two equivalent Ba and three Hg atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg(Hg11N3)2 by Materials Project

Mg(Hg11N3)2 crystallizes in the tetragonal I4/m space group. The structure is three-dimensional. Mg is bonded in a square co-planar geometry to four equivalent N atoms. All Mg–N bond lengths are 2.25 Å. There are five inequivalent Hg sites. In the first Hg site, Hg is bonded in a single-bond geometry to one Hg and one N atom. The Hg–Hg bond length is 2.79 Å. The Hg–N bond length is 2.22 Å. In the second Hg site, Hg is bonded in a single-bond geometry to one Hg and one N atom. The Hg–Hg bond length is 2.94 Å. The Hg–N bond length is 2.23 Å. In the third Hg site, Hg is bonded in a single-bond geometry to one Hg and one N atom. The Hg–Hg bond length is 3.11 Å. The Hg–N bond length is 2.48 Å. In the fourth Hg site, Hg is bonded to six Hg atoms to form HgHg6 octahedra that share a cornercorner with one NHg5 square pyramid. The Hg–Hg bond length is 2.90 Å. In the fifth Hg site, Hg is bonded to four equivalent Hg atoms to form distorted HgHg4 tetrahedra that share corners with four equivalent NHg5 square pyramids. There are two inequivalent N sites. In the first N site, N is bonded to five Hg atoms to form distorted NHg5 square pyramids that share a cornercorner with one HgHg6 octahedra and corners with four equivalent HgHg4 tetrahedra. The corner-sharing octahedral tilt angles are 0°. In the second N site, N is bonded in a distorted T-shaped geometry to one Mg and two equivalent Hg atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KHg6 by Materials Project

KHg6 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. K is bonded in a 12-coordinate geometry to sixteen Hg atoms. There are a spread of K–Hg bond distances ranging from 3.71–4.10 Å. There are six inequivalent Hg sites. In the first Hg site, Hg is bonded in a distorted pentagonal planar geometry to two equivalent K and three Hg atoms. There are two shorter (3.10 Å) and one longer (3.19 Å) Hg–Hg bond lengths. In the second Hg site, Hg is bonded in a 7-coordinate geometry to two equivalent K and five Hg atoms. There are a spread of Hg–Hg bond distances ranging from 2.99–3.30 Å. In the third Hg site, Hg is bonded in a 8-coordinate geometry to three equivalent K and five Hg atoms. There are a spread of Hg–Hg bond distances ranging from 3.02–3.28 Å. In the fourth Hg site, Hg is bonded in a 8-coordinate geometry to three equivalent K and five Hg atoms. There are one shorter (3.05 Å) and one longer (3.06 Å) Hg–Hg bond lengths. In the fifth Hg site, Hg is bonded in a 8-coordinate geometry to three equivalent K and five Hg atoms. In the sixth Hg site, Hg is bonded in a 6-coordinate geometry to three equivalent K and three Hg atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hg7Cl2O3 by Materials Project

Hg7O3Cl2 crystallizes in the orthorhombic Pbcm space group. The structure is three-dimensional. there are five inequivalent Hg+1.14+ sites. In the first Hg+1.14+ site, Hg+1.14+ is bonded in a 1-coordinate geometry to one Hg+1.14+, two equivalent O2-, and two Cl1- atoms. The Hg–Hg bond length is 2.63 Å. There are one shorter (2.18 Å) and one longer (2.76 Å) Hg–O bond lengths. There are one shorter (3.28 Å) and one longer (3.53 Å) Hg–Cl bond lengths. In the second Hg+1.14+ site, Hg+1.14+ is bonded in a distorted L-shaped geometry to one Hg+1.14+, two O2-, and one Cl1- atom. There are one shorter (2.28 Å) and one longer (2.45 Å) Hg–O bond lengths. The Hg–Cl bond length is 3.29 Å. In the third Hg+1.14+ site, Hg+1.14+ is bonded in a single-bond geometry to one O2- atom. The Hg–O bond length is 2.13 Å. In the fourth Hg+1.14+ site, Hg+1.14+ is bonded in a distorted L-shaped geometry to one O2- and one Cl1- atom. The Hg–O bond length is 2.38 Å. The Hg–Cl bond length is 2.52 Å. In the fifth Hg+1.14+ site, Hg+1.14+ is bonded in a distorted square co-planar geometry to two equivalent O2- and two equivalent Cl1- atoms. Both Hg–O bond lengths are 2.07 Å. Both Hg–Cl bond lengths are 3.03 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a tetrahedral geometry to four Hg+1.14+ atoms. In the second O2- site, O2- is bonded in a 4-coordinate geometry to four Hg+1.14+ atoms. There are two inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a distorted single-bond geometry to three Hg+1.14+ atoms. In the second Cl1- site, Cl1- is bonded in a 6-coordinate geometry to six Hg+1.14+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca4Hg9 by Materials Project

Ca4Hg9 crystallizes in the cubic P-43m space group. The structure is three-dimensional. there are two inequivalent Ca sites. In the first Ca site, Ca is bonded in a 11-coordinate geometry to eleven Hg atoms. There are a spread of Ca–Hg bond distances ranging from 3.14–3.58 Å. In the second Ca site, Ca is bonded in a 10-coordinate geometry to ten Hg atoms. There are a spread of Ca–Hg bond distances ranging from 3.22–3.50 Å. There are six inequivalent Hg sites. In the first Hg site, Hg is bonded in a 6-coordinate geometry to six Ca atoms. In the second Hg site, Hg is bonded in a 7-coordinate geometry to six Ca and one Hg atom. The Hg–Hg bond length is 3.08 Å. In the third Hg site, Hg is bonded in a 5-coordinate geometry to five Ca and one Hg atom. The Hg–Hg bond length is 3.09 Å. In the fourth Hg site, Hg is bonded in a 3-coordinate geometry to three equivalent Ca and three equivalent Hg atoms. All Hg–Hg bond lengths are 3.21 Å. In the fifth Hg site, Hg is bonded in a 11-coordinate geometry to four equivalent Ca and four Hg atoms. In the sixth Hg site, Hg is bonded in a 4-coordinate geometry to four Ca atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb15Hg16 by Materials Project

Rb15Hg16 crystallizes in the tetragonal I4_1/a space group. The structure is three-dimensional. there are five inequivalent Rb sites. In the first Rb site, Rb is bonded in a 5-coordinate geometry to six Hg atoms. There are a spread of Rb–Hg bond distances ranging from 3.87–4.25 Å. In the second Rb site, Rb is bonded in a 7-coordinate geometry to seven Hg atoms. There are a spread of Rb–Hg bond distances ranging from 3.76–3.99 Å. In the third Rb site, Rb is bonded in a 5-coordinate geometry to six Hg atoms. There are a spread of Rb–Hg bond distances ranging from 3.68–4.25 Å. In the fourth Rb site, Rb is bonded in a 8-coordinate geometry to eight Hg atoms. There are a spread of Rb–Hg bond distances ranging from 3.74–3.96 Å. In the fifth Rb site, Rb is bonded in a 8-coordinate geometry to eight Hg atoms. There are four shorter (3.97 Å) and four longer (3.98 Å) Rb–Hg bond lengths. There are four inequivalent Hg sites. In the first Hg site, Hg is bonded in a 8-coordinate geometry to five Rb and three equivalent Hg atoms. There are a spread of Hg–Hg bond distances ranging from 3.09–3.13 Å. In the second Hg site, Hg is bonded in a 8-coordinate geometry to six Rb and two equivalent Hg atoms. There are one shorter (3.09 Å) and one longer (3.18 Å) Hg–Hg bond lengths. In the third Hg site, Hg is bonded in a 9-coordinate geometry to six Rb and three equivalent Hg atoms. In the fourth Hg site, Hg is bonded in a 10-coordinate geometry to eight Rb and two equivalent Hg atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg(Hg11N3)2 by Materials Project

Mg(Hg11N3)2 crystallizes in the tetragonal I4/m space group. The structure is three-dimensional. Mg is bonded in a square co-planar geometry to four equivalent N atoms. All Mg–N bond lengths are 2.13 Å. There are five inequivalent Hg sites. In the first Hg site, Hg is bonded in a single-bond geometry to one Hg and one N atom. The Hg–Hg bond length is 2.71 Å. The Hg–N bond length is 2.20 Å. In the second Hg site, Hg is bonded in a single-bond geometry to one Hg and one N atom. The Hg–Hg bond length is 2.98 Å. The Hg–N bond length is 2.14 Å. In the third Hg site, Hg is bonded in a single-bond geometry to two Hg and one N atom. There are one shorter (3.10 Å) and one longer (3.27 Å) Hg–Hg bond lengths. The Hg–N bond length is 2.46 Å. In the fourth Hg site, Hg is bonded in a 9-coordinate geometry to nine Hg atoms. In the fifth Hg site, Hg is bonded in a 4-coordinate geometry to four equivalent Hg atoms. There are two inequivalent N sites. In the first N site, N is bonded in a distorted trigonal bipyramidal geometry to five Hg atoms. In the second N site, N is bonded in a trigonal planar geometry to one Mg and two equivalent Hg atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ga4Hg11(AsBr4)4 by Materials Project

Hg11Ga2(AsBr2)4(GaBr4)2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional and consists of four GaBr4 clusters and one Hg11Ga2(AsBr2)4 framework. In each GaBr4 cluster, Ga3+ is bonded in a tetrahedral geometry to four Br1- atoms. There are one shorter (2.32 Å) and three longer (2.38 Å) Ga–Br bond lengths. There are three inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a single-bond geometry to one Ga3+ atom. In the second Br1- site, Br1- is bonded in a single-bond geometry to one Ga3+ atom. In the third Br1- site, Br1- is bonded in a single-bond geometry to one Ga3+ atom. In the Hg11Ga2(AsBr2)4 framework, there are five inequivalent Hg+1.45+ sites. In the first Hg+1.45+ site, Hg+1.45+ is bonded in a linear geometry to one Hg+1.45+ and one As3- atom. The Hg–Hg bond length is 2.68 Å. The Hg–As bond length is 2.65 Å. In the second Hg+1.45+ site, Hg+1.45+ is bonded in a linear geometry to two As3- atoms. There are one shorter (2.55 Å) and one longer (2.56 Å) Hg–As bond lengths. In the third Hg+1.45+ site, Hg+1.45+ is bonded in a distorted rectangular see-saw-like geometry to one Hg+1.45+, one As3-, and two equivalent Br1- atoms. The Hg–Hg bond length is 2.67 Å. The Hg–As bond length is 2.63 Å. Both Hg–Br bond lengths are 3.64 Å. In the fourth Hg+1.45+ site, Hg+1.45+ is bonded in a distorted linear geometry to two As3- atoms. Both Hg–As bond lengths are 2.55 Å. In the fifth Hg+1.45+ site, Hg+1.45+ is bonded in a linear geometry to two equivalent Hg+1.45+ atoms. Ga3+ is bonded in a tetrahedral geometry to four Br1- atoms. There are one shorter (2.35 Å) and three longer (2.37 Å) Ga–Br bond lengths. There are two inequivalent As3- sites. In the first As3- site, As3- is bonded to four Hg+1.45+ atoms to form corner-sharing AsHg4 tetrahedra. In the second As3- site, As3- is bonded to four Hg+1.45+ atoms to form corner-sharing AsHg4 tetrahedra. There are three inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a single-bond geometry to one Ga3+ atom. In the second Br1- site, Br1- is bonded in a distorted single-bond geometry to one Hg+1.45+ and one Ga3+ atom. In the third Br1- site, Br1- is bonded in a single-bond geometry to one Ga3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2021

Data for "Relative Reactivity and Bioavailability of Mercury Sorbed to or Coprecipitated with Aged Iron Sulfides"

The potential for inorganic mercury (Hg) to be converted to methylmercury depends, in part, on the chemical form of Hg and its bioavailability to anaerobic microorganisms that can methylate Hg. In anaerobic settings, Hg can be associated with sulfide phases, including ferrous iron sulfide (FeS), which can sorb or coprecipitated with Hg. The objective of this study was to determine if the aging state of FeS alters the Hg coordination environment as well as the reactivity and bioavailability of sorbed and coprecipitated Hg species. FeS particles were synthesized with and without Hg2+ and aged in anaerobic conditions for multiple time frames spanning from 1 hour to 1 month. For FeS particles synthesized without Hg, Hg2+ was subsequently sorbed to the FeS for 1 day. Analysis of Hg speciation of these materials by X-ray absorption near edge spectroscopy revealed a predominance of 4-coodinate Hg-S species in the sorbed Hg-FeS solids and a mixture of 2- and 4-coordinate Hg-S in the coprecipitated Hg-FeS. The leaching potential of the Hg was assessed by exposing the particles to a solution of dissolved glutathione (a thiolate-based Hg chelator). As expected, the sorbed Hg-FeS released more soluble Hg compared to the co-precipitated Hg-FeS. However, when these particles were exposed to Desulfovibrio desulfuricans ND132 (a known Hg methylator), more Hg was methylated from the co-precipitated Hg-FeS than the sorbed Hg-FeS, consistent with expectations from the Hg-S coordination state and inconsistent with the selective leaching results. Overall, these results suggest that the bioavailability of particulate Hg cannot be easily discerned by leaching potential into bulk solution. Rather, bioavailability entails more subtle interactions at particle-cell interfaces and perhaps correlates with the local Hg-S coordination state in the particles. This data package contains data shown in the referenced publication, including all figures. Each figure is available in the respective *.csv file and a summary of all files are also included in the the xlsx file. Additional formatted data include X-ray diffraction data of the FeS solids are also available in a HPF format (Panalytical software), X-ray absorption spectroscopy data as *.prj files (Athena), and X-ray fluorescence data in its raw data form.

54 ENVIRONMENTAL SCIENCES↗
DOE OSTI2020

Materials Data on Ga4Hg11(PCl4)4 by Materials Project

Hg11P4(GaCl4)4 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional and consists of eight GaCl4 clusters and one Hg11P4 framework. In each GaCl4 cluster, Ga3+ is bonded in a tetrahedral geometry to four Cl1- atoms. There are one shorter (2.17 Å) and three longer (2.22 Å) Ga–Cl bond lengths. There are three inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a single-bond geometry to one Ga3+ atom. In the second Cl1- site, Cl1- is bonded in a single-bond geometry to one Ga3+ atom. In the third Cl1- site, Cl1- is bonded in a single-bond geometry to one Ga3+ atom. In the Hg11P4 framework, there are five inequivalent Hg+1.45+ sites. In the first Hg+1.45+ site, Hg+1.45+ is bonded in a distorted linear geometry to one Hg+1.45+ and one P3- atom. The Hg–Hg bond length is 2.67 Å. The Hg–P bond length is 2.52 Å. In the second Hg+1.45+ site, Hg+1.45+ is bonded in a linear geometry to one Hg+1.45+ and one P3- atom. The Hg–Hg bond length is 2.67 Å. The Hg–P bond length is 2.54 Å. In the third Hg+1.45+ site, Hg+1.45+ is bonded in a linear geometry to two equivalent Hg+1.45+ atoms. In the fourth Hg+1.45+ site, Hg+1.45+ is bonded in a distorted linear geometry to two P3- atoms. There are one shorter (2.43 Å) and one longer (2.44 Å) Hg–P bond lengths. In the fifth Hg+1.45+ site, Hg+1.45+ is bonded in a distorted linear geometry to two P3- atoms. There are one shorter (2.43 Å) and one longer (2.44 Å) Hg–P bond lengths. There are two inequivalent P3- sites. In the first P3- site, P3- is bonded to four Hg+1.45+ atoms to form corner-sharing PHg4 tetrahedra. In the second P3- site, P3- is bonded to four Hg+1.45+ atoms to form corner-sharing PHg4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on RbHg11 by Materials Project

RbHg11 crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Rb is bonded to twelve Hg atoms to form RbHg12 cuboctahedra that share corners with four equivalent HgHg12 cuboctahedra and corners with eight equivalent RbHg12 cuboctahedra. There are eight shorter (3.96 Å) and four longer (3.97 Å) Rb–Hg bond lengths. There are four inequivalent Hg sites. In the first Hg site, Hg is bonded to twelve equivalent Hg atoms to form distorted HgHg12 cuboctahedra that share corners with twelve equivalent RbHg12 cuboctahedra. All Hg–Hg bond lengths are 3.42 Å. In the second Hg site, Hg is bonded in a 6-coordinate geometry to six Hg atoms. There are three shorter (3.20 Å) and three longer (3.26 Å) Hg–Hg bond lengths. In the third Hg site, Hg is bonded in a distorted single-bond geometry to one Rb and five Hg atoms. All Hg–Hg bond lengths are 3.34 Å. In the fourth Hg site, Hg is bonded in a 10-coordinate geometry to two equivalent Rb and eight Hg atoms. Both Hg–Hg bond lengths are 3.23 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hg2Sb7H2Xe3F59 by Materials Project

(XeF5)3Hg2Sb7H2F44 crystallizes in the triclinic P-1 space group. The structure is two-dimensional and consists of six XeF5 clusters and one Hg2Sb7H2F44 sheet oriented in the (0, 1, 1) direction. In each XeF5 cluster, Xe is bonded in a distorted square pyramidal geometry to five F atoms. There is one shorter (1.96 Å) and four longer (1.97 Å) Xe–F bond length. There are five inequivalent F sites. In the first F site, F is bonded in a single-bond geometry to one Xe atom. In the second F site, F is bonded in a single-bond geometry to one Xe atom. In the third F site, F is bonded in a single-bond geometry to one Xe atom. In the fourth F site, F is bonded in a single-bond geometry to one Xe atom. In the fifth F site, F is bonded in a single-bond geometry to one Xe atom. In the Hg2Sb7H2F44 sheet, there are two inequivalent Hg sites. In the first Hg site, Hg is bonded in a 8-coordinate geometry to eight F atoms. There are a spread of Hg–F bond distances ranging from 2.32–2.51 Å. In the second Hg site, Hg is bonded in a 8-coordinate geometry to eight F atoms. There are a spread of Hg–F bond distances ranging from 2.32–2.61 Å. There are seven inequivalent Sb sites. In the first Sb site, Sb is bonded in an octahedral geometry to six F atoms. There are a spread of Sb–F bond distances ranging from 1.89–1.97 Å. In the second Sb site, Sb is bonded in an octahedral geometry to six F atoms. There are a spread of Sb–F bond distances ranging from 1.89–1.96 Å. In the third Sb site, Sb is bonded in an octahedral geometry to six F atoms. There are a spread of Sb–F bond distances ranging from 1.89–1.97 Å. In the fourth Sb site, Sb is bonded in an octahedral geometry to six F atoms. There are a spread of Sb–F bond distances ranging from 1.89–1.94 Å. In the fifth Sb site, Sb is bonded in an octahedral geometry to six F atoms. There are a spread of Sb–F bond distances ranging from 1.88–1.96 Å. In the sixth Sb site, Sb is bonded in an octahedral geometry to six F atoms. There are a spread of Sb–F bond distances ranging from 1.89–1.95 Å. In the seventh Sb site, Sb is bonded in an octahedral geometry to six F atoms. There are a spread of Sb–F bond distances ranging from 1.89–1.99 Å. There are two inequivalent H sites. In the first H site, H is bonded in a distorted linear geometry to two F atoms. There is one shorter (0.97 Å) and one longer (1.55 Å) H–F bond length. In the second H site, H is bonded in a distorted linear geometry to two F atoms. There is one shorter (0.97 Å) and one longer (1.54 Å) H–F bond length. There are forty-four inequivalent F sites. In the first F site, F is bonded in a single-bond geometry to one Sb atom. In the second F site, F is bonded in a bent 150 degrees geometry to one Sb and one H atom. In the third F site, F is bonded in a bent 150 degrees geometry to one Hg and one Sb atom. In the fourth F site, F is bonded in a single-bond geometry to one Sb atom. In the fifth F site, F is bonded in a single-bond geometry to one Sb atom. In the sixth F site, F is bonded in a single-bond geometry to one Sb atom. In the seventh F site, F is bonded in a distorted linear geometry to one Hg and one Sb atom. In the eighth F site, F is bonded in a distorted single-bond geometry to one Hg and one Sb atom. In the ninth F site, F is bonded in a water-like geometry to one Hg and one Sb atom. In the tenth F site, F is bonded in a distorted single-bond geometry to one Hg and one H atom. In the eleventh F site, F is bonded in a distorted single-bond geometry to one Hg and one H atom. In the twelfth F site, F is bonded in a single-bond geometry to one Sb atom. In the thirteenth F site, F is bonded in a single-bond geometry to one Sb atom. In the fourteenth F site, F is bonded in a single-bond geometry to one Sb atom. In the fifteenth F site, F is bonded in a distorted linear geometry to one Hg and one Sb atom. In the sixteenth F site, F is bonded in a distorted water-like geometry to one Hg and one Sb atom. In the seventeenth F site, F is bonded in a water-like geometry to one Hg and one Sb atom. In the eighteenth F site, F is bonded in a single-bond geometry to one Sb atom. In the nineteenth F site, F is bonded in a single-bond geometry to one Sb atom. In the twentieth F site, F is bonded in a single-bond geometry to one Sb atom. In the twenty-first F site, F is bonded in a bent 150 degrees geometry to one Sb and one H atom. In the twenty-second F site, F is bonded in a single-bond geometry to one Sb atom. In the twenty-third F site, F is bonded in a bent 150 degrees geometry to one Hg and one Sb atom. In the twenty-fourth F site, F is bonded in a single-bond geometry to one Sb atom. In the twenty-fifth F site, F is bonded in a single-bond geometry to one Sb atom. In the twenty-sixth F site, F is bonded in a single-bond geometry to one Sb atom. In the twenty-seventh F site, F is bonded in a single-bond geometry to one Sb atom. In the twenty-eighth F site, F is bonded in a distorted linear geometry to one Hg and one Sb atom. In the twenty-ninth F site, F is bonded in a bent 150 degrees geometry to one Hg and one Sb atom. In the thirtieth F site, F is bonded in a single-bond geometry to one Sb atom. In the thirty-first F site, F is bonded in a single-bond geometry to one Sb atom. In the thirty-second F site, F is bonded in a single-bond geometry to one Sb atom. In the thirty-third F site, F is bonded in a single-bond geometry to one Sb atom. In the thirty-fourth F site, F is bonded in a single-bond geometry to one Hg and one Sb atom. In the thirty-fifth F site, F is bonded in a distorted linear geometry to one Hg and one Sb atom. In the thirty-sixth F site, F is bonded in a single-bond geometry to one Sb atom. In the thirty-seventh F site, F is bonded in a single-bond geometry to one Sb atom. In the thirty-eighth F site, F is bonded in a single-bond geometry to one Sb atom. In the thirty-ninth F site, F is bonded in a linear geometry to one Hg and one Sb atom. In the fortieth F site, F is bonded in a single-bond geometry to one Sb atom. In the forty-first F site, F is bonded in a distorted linear geometry to one Hg and one Sb atom. In the forty-second F site, F is bonded in a single-bond geometry to one Sb atom. In the forty-third F site, F is bonded in a single-bond geometry to one Sb atom. In the forty-fourth F site, F is bonded in a single-bond geometry to one Sb atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hg7(P2Br3)2 by Materials Project

Hg7(P2Br3)2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are four inequivalent Hg+1.43+ sites. In the first Hg+1.43+ site, Hg+1.43+ is bonded in a distorted square co-planar geometry to two equivalent P1- and two equivalent Br1- atoms. Both Hg–P bond lengths are 2.49 Å. Both Hg–Br bond lengths are 3.36 Å. In the second Hg+1.43+ site, Hg+1.43+ is bonded to two P1- and four Br1- atoms to form distorted HgP2Br4 pentagonal pyramids that share corners with two equivalent HgP2Br4 pentagonal pyramids, corners with two PHg3P tetrahedra, and an edgeedge with one HgP2Br4 pentagonal pyramid. There are one shorter (2.50 Å) and one longer (2.51 Å) Hg–P bond lengths. There are a spread of Hg–Br bond distances ranging from 3.18–3.40 Å. In the third Hg+1.43+ site, Hg+1.43+ is bonded in a 5-coordinate geometry to two equivalent P1- and three Br1- atoms. There are one shorter (2.47 Å) and one longer (2.48 Å) Hg–P bond lengths. There are a spread of Hg–Br bond distances ranging from 2.99–3.32 Å. In the fourth Hg+1.43+ site, Hg+1.43+ is bonded in a 4-coordinate geometry to one P1- and four Br1- atoms. The Hg–P bond length is 2.48 Å. There are a spread of Hg–Br bond distances ranging from 2.63–3.63 Å. There are two inequivalent P1- sites. In the first P1- site, P1- is bonded to three Hg+1.43+ and one P1- atom to form PHg3P tetrahedra that share a cornercorner with one HgP2Br4 pentagonal pyramid and corners with two PHg3P tetrahedra. The P–P bond length is 2.21 Å. In the second P1- site, P1- is bonded to three Hg+1.43+ and one P1- atom to form PHg3P tetrahedra that share a cornercorner with one HgP2Br4 pentagonal pyramid and corners with three PHg3P tetrahedra. There are three inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a 1-coordinate geometry to four Hg+1.43+ atoms. In the second Br1- site, Br1- is bonded in a 5-coordinate geometry to five Hg+1.43+ atoms. In the third Br1- site, Br1- is bonded in a distorted water-like geometry to three Hg+1.43+ atoms.

36 MATERIALS SCIENCE↗