Synthesis of Li{sub 2}PtH{sub 6} using high pressure: Completion of the homologous series A{sub 2}PtH{sub 6} (A=alkali metal)

Journal Article · Sun Aug 15 04:00:00 EDT 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.05.033· OSTI ID:21421576

Puhakainen, Kati; Stoyanov, Emil; Evans, Michael J; Leinenweber, Kurt ^[1]; Haeussermann, Ulrich ^[1]

---

1. Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287-1604 (United States)

Li{sub 2}PtH{sub 6}, the missing member of the complex transition metal hydride series A{sub 2}PtH{sub 6} (A=alkali metal), was prepared by reacting mixtures of LiH and Pt in the presence of BH{sub 3}NH{sub 3} as hydrogen source at pressures above 8 GPa. According to powder X-ray diffraction analysis, Li{sub 2}PtH{sub 6} is isostructural to its heavier homologues and crystallizes in the cubic K{sub 2}PtCl{sub 6} structure (space group Fm3-bar m, a=6.7681(3), Z=4). However, PtH{sub 6}{sup 2-} octahedral complexes in Li{sub 2}PtH{sub 6} approach each other closely and its structure may likewise be regarded as a defective perovskite structure where half of the octahedrally coordinated atoms (cations) are missing. The IR spectrum of Li{sub 2}PtH{sub 6} reveals the Pt-H T{sub 1u} stretch and bend at 1840 and 889 cm{sup -1}, respectively. - Graphical abstract: Li{sub 2}PtH{sub 6}, the missing start member of the complex metal hydride series A{sub 2}PtH{sub 6} (A=alkali metal) has been prepared by high pressure hydrogenation. In contrast to the heavier homologues, PtH{sub 6}{sup 2-} octahedral units in Li{sub 2}PtH{sub 6} are not well separated and H atoms form a substructure closely corresponding to that of O atoms in cubic perovskite.

• OSTI ID: 21421576
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 8 Vol. 183; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALKALI METAL COMPOUNDS
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
DIFFRACTION
ELEMENTS
HYDRIDES
HYDROGEN
HYDROGEN COMPOUNDS
INFRARED SPECTRA
LITHIUM COMPOUNDS
LITHIUM HYDRIDES
MINERALS
NONMETALS
OXIDE MINERALS
PEROVSKITE
PEROVSKITES
PLATINUM COMPOUNDS
PRESSURE RANGE
PRESSURE RANGE GIGA PA
SCATTERING
SPACE GROUPS
SPECTRA
SYMMETRY GROUPS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION