Synthesis, Structure, and Properties of the New Intermetallic Compounds SrPdTl2 and SrPtTl2

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• 作者：Shengfeng Liu and John D. Corbett
• 刊名：Inorganic Chemistry
• 出版年：2003
• 出版时间：August 11, 2003
• 年：2003
• 卷：42
• 期：16
• 页码：4898 - 4901
• 全文大小：269K
• 年卷期：v.42,no.16(August 11, 2003)
• ISSN：1520-510X

文摘

The title compounds have been synthesized and characterized structurally and through property measurementsand electronic structure calculations. Single-crystal X-ray diffraction analyses reveal that the two compounds crystallizein an orthorhombic system, MgCuAl₂ type (Cmcm, Z = 4, a = 4.486(2), 4.491(3) Å, b = 10.991(5), 10.990(6) Å,c = 8.154(1), 8.140(4) Å for SrPdTl₂, and SrPtTl₂, respectively). The structure can be directly derived from that ofhexagonal SrTl₂ (CaIn₂ type) in which four-bonded thallium atoms in shared puckered hexagons generate tunnels.The Pd or Pt is encapsulated (with symmetry reduction) on the side of each tunnel within a distorted trigonal prism.Band structure calculations (EHTB) on both SrTl₂ and SrPdTl₂ demonstrate the effects of the conversion, withstrong Pd-Tl bonding and appreciable electron transfer from Tl to Pd. Property measurements show that SrPdTl₂is metallic, as expected.