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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Pt(NO3)2 by Materials Project

Pt(NO3)2 crystallizes in the trigonal R-3 space group. The structure is two-dimensional and consists of three Pt(NO3)2 sheets oriented in the (0, 0, 1) direction. Pt2+ is bonded in an octahedral geometry to six equivalent O2- atoms. All Pt–O bond lengths are 2.15 Å. N5+ is bonded in a trigonal planar geometry to three equivalent O2- atoms. All N–O bond lengths are 1.29 Å. O2- is bonded in a bent 120 degrees geometry to one Pt2+ and one N5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pt(NO3)2 by Materials Project

Pt(NO3)2 crystallizes in the triclinic P-1 space group. The structure is one-dimensional and consists of one oxygen molecule and one Pt(NO2)2 ribbon oriented in the (1, 0, 0) direction. In the Pt(NO2)2 ribbon, Pt2+ is bonded to six O2- atoms to form edge-sharing PtO6 octahedra. There are four shorter (2.00 Å) and two longer (2.06 Å) Pt–O bond lengths. N5+ is bonded in a single-bond geometry to one O2- atom. The N–O bond length is 1.29 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 120 degrees geometry to one Pt2+ and one N5+ atom. In the second O2- site, O2- is bonded in a water-like geometry to two equivalent Pt2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on H12PtN6(ClO3)2 by Materials Project

Pt(NH3)4Cl2(NO3)2 crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of two nitric acid molecules and one Pt(NH3)4Cl2 cluster. In the Pt(NH3)4Cl2 cluster, Pt4+ is bonded in an octahedral geometry to four N+0.33- and two equivalent Cl1- atoms. There are two shorter (2.07 Å) and two longer (2.08 Å) Pt–N bond lengths. Both Pt–Cl bond lengths are 2.34 Å. There are two inequivalent N+0.33- sites. In the first N+0.33- site, N+0.33- is bonded in a distorted trigonal non-coplanar geometry to one Pt4+ and three H1+ atoms. There is one shorter (1.03 Å) and two longer (1.04 Å) N–H bond length. In the second N+0.33- site, N+0.33- is bonded in a distorted trigonal non-coplanar geometry to one Pt4+ and three H1+ atoms. There is two shorter (1.03 Å) and one longer (1.04 Å) N–H bond length. There are six inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one N+0.33- atom. In the second H1+ site, H1+ is bonded in a single-bond geometry to one N+0.33- atom. In the third H1+ site, H1+ is bonded in a single-bond geometry to one N+0.33- atom. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one N+0.33- atom. In the fifth H1+ site, H1+ is bonded in a single-bond geometry to one N+0.33- atom. In the sixth H1+ site, H1+ is bonded in a single-bond geometry to one N+0.33- atom. Cl1- is bonded in a single-bond geometry to one Pt4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pt(NO)6 by Materials Project

PtN2N2(NO3)2 crystallizes in the monoclinic C2/c space group. The structure is zero-dimensional and consists of sixteen ammonia molecules, eight cis-platinum-(nh3)2 molecules, and sixteen nitric acid molecules.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CoH20PtC4(NO3)4 by Materials Project

Pt(NH3)4CoH4(C2O5)2(H2O)2 crystallizes in the orthorhombic I222 space group. The structure is zero-dimensional and consists of four water molecules, two CoH4(C2O5)2 clusters, and two Pt(NH3)4 clusters. In each CoH4(C2O5)2 cluster, Co2+ is bonded in an octahedral geometry to six O2- atoms. There are two shorter (2.06 Å) and four longer (2.12 Å) Co–O bond lengths. C4+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.25 Å) and one longer (1.28 Å) C–O bond length. H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one C4+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to one Co2+ and two equivalent H1+ atoms. In the third O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Co2+ and one C4+ atom. In each Pt(NH3)4 cluster, Pt2- is bonded in a square co-planar geometry to four equivalent N3- atoms. All Pt–N bond lengths are 2.07 Å. N3- is bonded in a distorted trigonal non-coplanar geometry to one Pt2- and three H1+ atoms. All N–H bond lengths are 1.03 Å. There are three 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.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NiH20PtC4(NO3)4 by Materials Project

Pt(NH3)4NiH4(C2O5)2(H2O)2 crystallizes in the orthorhombic I222 space group. The structure is zero-dimensional and consists of four water molecules, two NiH4(C2O5)2 clusters, and two Pt(NH3)4 clusters. In each NiH4(C2O5)2 cluster, Ni2+ is bonded in an octahedral geometry to six O2- atoms. There are four shorter (2.07 Å) and two longer (2.08 Å) Ni–O bond lengths. C4+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.26 Å) and one longer (1.28 Å) C–O bond length. H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one C4+ atom. In the second O2- site, O2- is bonded in a distorted water-like geometry to one Ni2+ and two equivalent H1+ atoms. In the third O2- site, O2- is bonded in a distorted water-like geometry to one Ni2+ and one C4+ atom. In each Pt(NH3)4 cluster, Pt2- is bonded in a square co-planar geometry to four equivalent N3- atoms. All Pt–N bond lengths are 2.06 Å. N3- is bonded in a distorted trigonal non-coplanar geometry to one Pt2- and three H1+ atoms. All N–H bond lengths are 1.03 Å. There are three 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.

36 MATERIALS SCIENCE↗
NASA NTRS2010

Process for Making a Noble Metal on Tin Oxide Catalyst

To produce a noble metal-on-metal oxide catalyst on an inert, high-surface-area support material (that functions as a catalyst at approximately room temperature using chloride-free reagents), for use in a carbon dioxide laser, requires two steps: First, a commercially available, inert, high-surface-area support material (silica spheres) is coated with a thin layer of metal oxide, a monolayer equivalent. Very beneficial results have been obtained using nitric acid as an oxidizing agent because it leaves no residue. It is also helpful if the spheres are first deaerated by boiling in water to allow the entire surface to be coated. A metal, such as tin, is then dissolved in the oxidizing agent/support material mixture to yield, in the case of tin, metastannic acid. Although tin has proven especially beneficial for use in a closed-cycle CO2 laser, in general any metal with two valence states, such as most transition metals and antimony, may be used. The metastannic acid will be adsorbed onto the high-surface-area spheres, coating them. Any excess oxidizing agent is then evaporated, and the resulting metastannic acid-coated spheres are dried and calcined, whereby the metastannic acid becomes tin(IV) oxide. The second step is accomplished by preparing an aqueous mixture of the tin(IV) oxide-coated spheres, and a soluble, chloride-free salt of at least one catalyst metal. The catalyst metal may be selected from the group consisting of platinum, palladium, ruthenium, gold, and rhodium, or other platinum group metals. Extremely beneficial results have been obtained using chloride-free salts of platinum, palladium, or a combination thereof, such as tetraammineplatinum (II) hydroxide ([Pt(NH3)4] (OH)2), or tetraammine palladium nitrate ([Pd(NH3)4](NO3)2).

Davis, Patricia↗
DOE OSTI2020

Materials Data on PtN3O4 by Materials Project

(PtON1)3N2NONO2(NO3)2 crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of four ammonia molecules, four nitric acid molecules, two nitrous acid molecules, two nitroxyl molecules, and two PtON1 clusters. In each PtON1 cluster, there are three inequivalent Pt5+ sites. In the first Pt5+ site, Pt5+ is bonded in a 3-coordinate geometry to one N1+ and two O2- atoms. The Pt–N bond length is 1.75 Å. There are one shorter (1.94 Å) and one longer (2.10 Å) Pt–O bond lengths. In the second Pt5+ site, Pt5+ is bonded in a distorted T-shaped geometry to one N1+ and two O2- atoms. The Pt–N bond length is 1.74 Å. There are one shorter (1.89 Å) and one longer (2.14 Å) Pt–O bond lengths. In the third Pt5+ site, Pt5+ is bonded in a T-shaped geometry to one N1+ and two O2- atoms. The Pt–N bond length is 1.72 Å. There is one shorter (1.86 Å) and one longer (2.04 Å) Pt–O bond length. There are three inequivalent N1+ sites. In the first N1+ site, N1+ is bonded in a single-bond geometry to one Pt5+ atom. In the second N1+ site, N1+ is bonded in a single-bond geometry to one Pt5+ atom. In the third N1+ site, N1+ is bonded in a single-bond geometry to one Pt5+ atom. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to two Pt5+ atoms. In the second O2- site, O2- is bonded in a bent 120 degrees geometry to two Pt5+ atoms. In the third O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two Pt5+ atoms.

36 MATERIALS SCIENCE↗