Synthesis of Li2PtH6 using high pressure: Completion of the homologous series A2PtH6 (A=alkali metal)

✍ Scribed by Kati Puhakainen; Emil Stoyanov; Michael J. Evans; Kurt Leinenweber; Ulrich Häussermann

• Book ID: 104030663
• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 301 KB
• Volume: 183
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1016/j.jssc.2010.05.033

✦ Synopsis

Li 2 PtH 6 , the missing member of the complex transition metal hydride series A 2 PtH 6 (A¼ alkali metal), was prepared by reacting mixtures of LiH and Pt in the presence of BH 3 NH 3 as hydrogen source at pressures above 8 GPa. According to powder X-ray diffraction analysis, Li 2 PtH 6 is isostructural to its heavier homologues and crystallizes in the cubic K 2 PtCl 6 structure (space group Fm3 ¯m, a ¼ 6.7681(3), Z ¼4). However, PtH 6 2 À octahedral complexes in Li 2 PtH 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 2 PtH 6 reveals the Pt-H T 1u stretch and bend at 1840 and 889 cm À 1 , respectively.