Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “cluster structure”

Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 1,261 records · Page 70
All sourcesNASA NTRSDOE OSTI
DOE OSTI2026

Trafficking of a nitrogenase FeMo-cofactor assembly intermediate

The maturation of the unique FeMo-cofactor of molybdenum nitrogenase is a multistep process requiring the sequential action of a series of maturase complexes. As a final step, the NifEN complex forms FeMo-cofactor from the precursor NifB-co, also called L-cluster, through replacement of an apical iron ion by molybdenum and the attachment of an organic homocitrate ligand. NifB-co is delivered by a small cofactor chaperone, NifX, and initially bound near the surface of the maturase NifEN. Here, we report high-resolution cryo-electron microscopy structures of NifEN in complex with NifX, showing NifB-co binding to NifEN in full detail, capturing both interacting partners in the act of cluster transfer. In a dynamic transfer complex, the large metal cluster is coordinated by single residues from both NifEN and NifX. In silico studies concur with these structures but suggest a third, internal conversion site where cluster maturation likely takes place.

metalloproteins↗
DOE OSTI2020

Materials Data on Hf3(Bi5Cl9)2 by Materials Project

Hf3BiCl18(Bi)9 crystallizes in the hexagonal P6_3 space group. The structure is zero-dimensional and consists of two Bi clusters and two Hf3BiCl18 clusters. In each Bi cluster, there are three inequivalent Bi sites. In the first Bi site, Bi is bonded in a 4-coordinate geometry to four Bi atoms. There are a spread of Bi–Bi bond distances ranging from 3.12–3.24 Å. In the second Bi site, Bi is bonded in a 4-coordinate geometry to four Bi atoms. There are one shorter (3.13 Å) and one longer (3.18 Å) Bi–Bi bond lengths. In the third Bi site, Bi is bonded in a 6-coordinate geometry to two equivalent Bi atoms. In each Hf3BiCl18 cluster, Hf is bonded in an octahedral geometry to six Cl atoms. There are a spread of Hf–Cl bond distances ranging from 2.38–2.56 Å. Bi is bonded in a trigonal planar geometry to three equivalent Cl atoms. All Bi–Cl bond lengths are 2.75 Å. There are six inequivalent Cl sites. In the first Cl site, Cl is bonded in a single-bond geometry to one Hf atom. In the second Cl site, Cl is bonded in a single-bond geometry to one Hf atom. In the third Cl site, Cl is bonded in a bent 120 degrees geometry to one Hf and one Bi atom. In the fourth Cl site, Cl is bonded in a single-bond geometry to one Hf atom. In the fifth Cl site, Cl is bonded in a single-bond geometry to one Hf atom. In the sixth Cl site, Cl is bonded in a single-bond geometry to one Hf atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on RhC2ClO2 by Materials Project

RhC2O2Cl is Theoretical Carbon Structure structured and crystallizes in the tetragonal I-42d space group. The structure is zero-dimensional and consists of eight RhC2O2Cl clusters. Rh3+ is bonded in a rectangular see-saw-like geometry to two C1+ and two equivalent Cl1- atoms. Both Rh–C bond lengths are 1.85 Å. There are one shorter (2.40 Å) and one longer (2.41 Å) Rh–Cl bond lengths. There are two inequivalent C1+ sites. In the first C1+ site, C1+ is bonded in a single-bond geometry to one Rh3+ and one O2- atom. The C–O bond length is 1.16 Å. In the second C1+ site, C1+ is bonded in a single-bond geometry to one Rh3+ and one O2- atom. The C–O bond length is 1.16 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one C1+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to one C1+ atom. Cl1- is bonded in an L-shaped geometry to two equivalent Rh3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TcC5IO5 by Materials Project

TcC5O5I is alpha U structured and crystallizes in the orthorhombic Cmcm space group. The structure is zero-dimensional and consists of four TcC5O5I clusters. Tc1- is bonded in a distorted square pyramidal geometry to five C+2.40+ and one I1- atom. There is one shorter (1.94 Å) and four longer (2.01 Å) Tc–C bond length. The Tc–I bond length is 2.86 Å. There are two inequivalent C+2.40+ sites. In the first C+2.40+ site, C+2.40+ is bonded in a linear geometry to one Tc1- and one O2- atom. The C–O bond length is 1.16 Å. In the second C+2.40+ site, C+2.40+ is bonded in a linear geometry to one Tc1- and one O2- atom. The C–O bond length is 1.15 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. I1- is bonded in a single-bond geometry to one Tc1- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on B5F6 by Materials Project

B5F6 crystallizes in the tetragonal I4_1/a space group. The structure is zero-dimensional and consists of four B5F6 clusters. there are three inequivalent B sites. In the first B site, B is bonded in a 5-coordinate geometry to five B atoms. There are a spread of B–B bond distances ranging from 1.60–1.79 Å. In the second B site, B is bonded in a bent 120 degrees geometry to two equivalent B and two equivalent F atoms. Both B–F bond lengths are 1.35 Å. In the third B site, B is bonded in a bent 120 degrees geometry to one B and two F atoms. There is one shorter (1.33 Å) and one longer (1.34 Å) B–F bond length. There are three inequivalent F sites. In the first F site, F is bonded in a single-bond geometry to one B atom. In the second F site, F is bonded in a single-bond geometry to one B atom. In the third F site, F is bonded in a single-bond geometry to one B atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on As4S5 by Materials Project

As4S5 crystallizes in the monoclinic P2_1/m space group. The structure is zero-dimensional and consists of two As4S5 clusters. there are three inequivalent As+2.50+ sites. In the first As+2.50+ site, As+2.50+ is bonded in a trigonal non-coplanar geometry to three S2- atoms. There are a spread of As–S bond distances ranging from 2.27–2.29 Å. In the second As+2.50+ site, As+2.50+ is bonded in a water-like geometry to two equivalent S2- atoms. Both As–S bond lengths are 2.28 Å. In the third As+2.50+ site, As+2.50+ is bonded in a water-like geometry to two equivalent S2- atoms. Both As–S bond lengths are 2.26 Å. There are three inequivalent S2- sites. In the first S2- site, S2- is bonded in a bent 120 degrees geometry to two equivalent As+2.50+ atoms. In the second S2- site, S2- is bonded in a water-like geometry to two As+2.50+ atoms. In the third S2- site, S2- is bonded in a water-like geometry to two As+2.50+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TeSe by Materials Project

TeSe crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of one TeSe cluster. there are three inequivalent Te sites. In the first Te site, Te is bonded in a distorted single-bond geometry to one Se atom. The Te–Se bond length is 2.67 Å. In the second Te site, Te is bonded in a distorted single-bond geometry to one Se atom. The Te–Se bond length is 2.65 Å. In the third Te site, Te is bonded in a water-like geometry to two Se atoms. There are one shorter (2.62 Å) and one longer (2.64 Å) Te–Se bond lengths. There are three inequivalent Se sites. In the first Se site, Se is bonded in a distorted water-like geometry to one Te and one Se atom. The Se–Se bond length is 2.45 Å. In the second Se site, Se is bonded in a water-like geometry to two Te atoms. In the third Se site, Se is bonded in a distorted water-like geometry to one Te and one Se atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AuS5N5Cl4 by Materials Project

AuCl4(NS)5 crystallizes in the monoclinic P2_1/m space group. The structure is zero-dimensional and consists of two AuCl4 clusters and two NS clusters. In each AuCl4 cluster, Au5+ is bonded in a rectangular see-saw-like geometry to four Cl1- atoms. All Au–Cl bond lengths are 2.32 Å. There are two inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a distorted single-bond geometry to one Au5+ atom. In the second Cl1- site, Cl1- is bonded in a distorted single-bond geometry to one Au5+ atom. In each NS cluster, there are three inequivalent N+1.80+ sites. In the first N+1.80+ site, N+1.80+ is bonded in a bent 150 degrees geometry to two S2- atoms. Both N–S bond lengths are 1.58 Å. In the second N+1.80+ site, N+1.80+ is bonded in a bent 150 degrees geometry to two S2- atoms. There is one shorter (1.56 Å) and one longer (1.57 Å) N–S bond length. In the third N+1.80+ site, N+1.80+ is bonded in a distorted bent 150 degrees geometry to two equivalent S2- atoms. Both N–S bond lengths are 1.59 Å. There are three inequivalent S2- sites. In the first S2- site, S2- is bonded in a bent 120 degrees geometry to two equivalent N+1.80+ atoms. In the second S2- site, S2- is bonded in a water-like geometry to two N+1.80+ atoms. In the third S2- site, S2- is bonded in a water-like geometry to two N+1.80+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ta4S9Br8 by Materials Project

Ta4S9Br8 crystallizes in the tetragonal I4mm space group. The structure is zero-dimensional and consists of two Ta4S9Br8 clusters. Ta5+ is bonded to five S2- and two Br+0.25- atoms to form a mixture of face and corner-sharing TaS5Br2 pentagonal bipyramids. There are a spread of Ta–S bond distances ranging from 2.48–2.54 Å. Both Ta–Br bond lengths are 2.50 Å. There are three inequivalent S2- sites. In the first S2- site, S2- is bonded in a 2-coordinate geometry to two equivalent Ta5+ and one S2- atom. The S–S bond length is 2.06 Å. In the second S2- site, S2- is bonded in a 2-coordinate geometry to two equivalent Ta5+ and one S2- atom. In the third S2- site, S2- is bonded in a 4-coordinate geometry to four equivalent Ta5+ atoms. There are two inequivalent Br+0.25- sites. In the first Br+0.25- site, Br+0.25- is bonded in a single-bond geometry to one Ta5+ atom. In the second Br+0.25- site, Br+0.25- is bonded in a single-bond geometry to one Ta5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on H6CNF by Materials Project

CNH6F is gamma nitrogen structured and crystallizes in the orthorhombic Pbcm space group. The structure is zero-dimensional and consists of four CNH6F clusters. C2- is bonded in a tetrahedral geometry to one N3- and three H1+ atoms. The C–N bond length is 1.48 Å. There is two shorter (1.09 Å) and one longer (1.10 Å) C–H bond length. N3- is bonded in a tetrahedral geometry to one C2- and three H1+ atoms. There is two shorter (1.04 Å) and one longer (1.08 Å) N–H bond length. There are four inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a linear geometry to one N3- and one F1- atom. The H–F bond length is 1.53 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the third H1+ site, H1+ is bonded in a single-bond geometry to one C2- atom. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one C2- atom. F1- is bonded in a single-bond geometry to one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BH6N by Materials Project

NH3BH3 is Silicon tetrafluoride-derived structured and crystallizes in the monoclinic P2_1 space group. The structure is zero-dimensional and consists of two NH3BH3 clusters. B3- is bonded in a tetrahedral geometry to one N3- and three H1+ atoms. The B–N bond length is 1.60 Å. All B–H bond lengths are 1.22 Å. N3- is bonded in a tetrahedral geometry to one B3- and three H1+ atoms. All N–H bond lengths are 1.03 Å. There are six inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the second H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the third H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one B3- atom. In the fifth H1+ site, H1+ is bonded in a single-bond geometry to one B3- atom. In the sixth H1+ site, H1+ is bonded in a single-bond geometry to one B3- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BH6N by Materials Project

NH3BH3 is Silicon tetrafluoride-derived structured and crystallizes in the monoclinic P2_1 space group. The structure is zero-dimensional and consists of four NH3BH3 clusters. In two of the NH3BH3 clusters, B3- is bonded in a tetrahedral geometry to one N3- and three H1+ atoms. The B–N bond length is 1.61 Å. There is two shorter (1.22 Å) and one longer (1.23 Å) B–H bond length. N3- is bonded in a tetrahedral geometry to one B3- and three H1+ atoms. All N–H bond lengths are 1.03 Å. There are six inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the second H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the third H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one B3- atom. In the fifth H1+ site, H1+ is bonded in a single-bond geometry to one B3- atom. In the sixth H1+ site, H1+ is bonded in a single-bond geometry to one B3- atom. In two of the NH3BH3 clusters, B3- is bonded in a tetrahedral geometry to one N3- and three H1+ atoms. The B–N bond length is 1.62 Å. All B–H bond lengths are 1.22 Å. N3- is bonded in a tetrahedral geometry to one B3- and three H1+ atoms. All N–H bond lengths are 1.03 Å. There are six inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the second H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the third H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one B3- atom. In the fifth H1+ site, H1+ is bonded in a single-bond geometry to one B3- atom. In the sixth H1+ site, H1+ is bonded in a single-bond geometry to one B3- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SXeO3F2 by Materials Project

XeSO3F2 is Cubic alpha N2 structured and crystallizes in the orthorhombic Pbca space group. The structure is zero-dimensional and consists of eight XeSO3F2 clusters. Xe is bonded in a linear geometry to one O and one F atom. The Xe–O bond length is 2.25 Å. The Xe–F bond length is 2.05 Å. S is bonded in a tetrahedral geometry to three O and one F atom. There is two shorter (1.43 Å) and one longer (1.53 Å) S–O bond length. The S–F bond length is 1.61 Å. There are three inequivalent O sites. In the first O site, O is bonded in a bent 120 degrees geometry to one Xe and one S atom. In the second O site, O is bonded in a single-bond geometry to one S atom. In the third O site, O is bonded in a single-bond geometry to one S atom. There are two inequivalent F sites. In the first F site, F is bonded in a single-bond geometry to one S atom. In the second F site, F is bonded in a single-bond geometry to one Xe atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BPBr2NCl3 by Materials Project

BPNBr2Cl3 is Tetraauricupride-derived structured and crystallizes in the orthorhombic Cmce space group. The structure is zero-dimensional and consists of four BPNBr2Cl3 clusters. B3+ is bonded to two equivalent N3- and two equivalent Br1- atoms to form BBr2N2 tetrahedra that share corners with two equivalent PNCl3 tetrahedra and an edgeedge with one BBr2N2 tetrahedra. Both B–N bond lengths are 1.56 Å. Both B–Br bond lengths are 2.03 Å. P5+ is bonded to one N3- and three Cl1- atoms to form PNCl3 tetrahedra that share corners with two equivalent BBr2N2 tetrahedra. The P–N bond length is 1.57 Å. There is two shorter (1.98 Å) and one longer (2.00 Å) P–Cl bond length. N3- is bonded in a distorted T-shaped geometry to two equivalent B3+ and one P5+ atom. Br1- is bonded in a single-bond geometry to one B3+ atom. There are two inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a single-bond geometry to one P5+ atom. In the second Cl1- site, Cl1- is bonded in a single-bond geometry to one P5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tl6S by Materials Project

STl6 is Hg_xSn structured and crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of one STl6 cluster. there are six inequivalent Tl sites. In the first Tl site, Tl is bonded in a single-bond geometry to one S atom. The Tl–S bond length is 2.90 Å. In the second Tl site, Tl is bonded in a single-bond geometry to one S atom. The Tl–S bond length is 2.85 Å. In the third Tl site, Tl is bonded in a single-bond geometry to one S atom. The Tl–S bond length is 2.86 Å. In the fourth Tl site, Tl is bonded in a single-bond geometry to one S atom. The Tl–S bond length is 2.90 Å. In the fifth Tl site, Tl is bonded in a single-bond geometry to one S atom. The Tl–S bond length is 2.85 Å. In the sixth Tl site, Tl is bonded in a single-bond geometry to one S atom. The Tl–S bond length is 2.90 Å. S is bonded in an octahedral geometry to six Tl atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PPd6 by Materials Project

Pd6P crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of four Pd6P clusters. there are six inequivalent Pd sites. In the first Pd site, Pd is bonded in a distorted single-bond geometry to one P atom. The Pd–P bond length is 2.29 Å. In the second Pd site, Pd is bonded in a 1-coordinate geometry to one P atom. The Pd–P bond length is 2.28 Å. In the third Pd site, Pd is bonded in a 1-coordinate geometry to one P atom. The Pd–P bond length is 2.30 Å. In the fourth Pd site, Pd is bonded in a distorted single-bond geometry to one P atom. The Pd–P bond length is 2.29 Å. In the fifth Pd site, Pd is bonded in a distorted single-bond geometry to one P atom. The Pd–P bond length is 2.28 Å. In the sixth Pd site, Pd is bonded in a 1-coordinate geometry to one P atom. The Pd–P bond length is 2.30 Å. P is bonded in a 6-coordinate geometry to six Pd atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SNCl by Materials Project

NSCl is beta Sn-like structured and crystallizes in the monoclinic P2_1/m space group. The structure is zero-dimensional and consists of two NSCl clusters. there are two inequivalent N3+ sites. In the first N3+ site, N3+ is bonded in a bent 120 degrees geometry to two equivalent S2- atoms. Both N–S bond lengths are 1.61 Å. In the second N3+ site, N3+ is bonded in a bent 120 degrees geometry to two S2- atoms. Both N–S bond lengths are 1.61 Å. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a distorted trigonal non-coplanar geometry to two equivalent N3+ and one Cl1- atom. The S–Cl bond length is 2.15 Å. In the second S2- site, S2- is bonded in a distorted trigonal non-coplanar geometry to two N3+ and one Cl1- atom. The S–Cl bond length is 2.18 Å. There are two inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a single-bond geometry to one S2- atom. In the second Cl1- site, Cl1- is bonded in a single-bond geometry to one S2- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AuSCl5 by Materials Project

AuSCl5 crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of four AuSCl5 clusters. Au1- is bonded in a rectangular see-saw-like geometry to one S6+ and three Cl1- atoms. The Au–S bond length is 2.38 Å. There are a spread of Au–Cl bond distances ranging from 2.30–2.34 Å. S6+ is bonded in a distorted trigonal non-coplanar geometry to one Au1- and two Cl1- atoms. There are one shorter (2.01 Å) and one longer (2.02 Å) S–Cl bond lengths. There are five inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a single-bond geometry to one S6+ atom. In the second Cl1- site, Cl1- is bonded in a single-bond geometry to one Au1- atom. In the third Cl1- site, Cl1- is bonded in a single-bond geometry to one Au1- atom. In the fourth Cl1- site, Cl1- is bonded in a single-bond geometry to one Au1- atom. In the fifth Cl1- site, Cl1- is bonded in a single-bond geometry to one S6+ atom.

36 MATERIALS SCIENCE↗