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Synthesis and Structure of the Intermetallic Lithium Stannides Li T Sn 4 ( T = Ru, Rh, Ir) with Ordered PdGa 5 Type Structure
Author(s) -
Wu Zhiyun,
Hoffmann RolfDieter,
Pöttgen Rainer
Publication year - 2002
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/1521-3749(200207)628:7<1484::aid-zaac1484>3.0.co;2-#
Subject(s) - intermetallic , lithium (medication) , materials science , structure type , lanthanide , crystal structure , crystallography , x ray crystallography , metallurgy , chemistry , alloy , diffraction , physics , medicine , ion , organic chemistry , optics , endocrinology
LiRuSn 4 , LiRhSn 4 , and LiIrSn 4 were prepared by reaction of the elements in sealed tantalum ampoules at 1220 K. The tubes were subsequently annealed at 870 K for one week. The three stannides were investigated by X‐ray diffraction on powders and single crystals and the structures were refined from single crystal data: I 4 /mcm , a = 662.61(3), c = 1116.98(7) pm, wR 2 = 0.0730, 283 F 2 values for LiRuSn 4 , a = 658.73(5), c = 1136.4(1) pm, wR 2 = 0.0532, 313 F 2 values for LiRhSn 4 and a = 657.34(5), c = 1130.4(1) pm, wR 2 = 0.0343, 176 F 2 values for LiIrSn 4 with 11 variables for each refinement. LiRuSn 4 , LiRhSn 4 , and LiIrSn 4 crystallize with a ternary ordered variant of the PdGa 5 structure. The transition metal ( T ) atoms have a square antiprismatic tin environment and they form two‐dimensional [ T Sn 4 ] polyanions with relatively short Ru—Sn (279 pm), Rh—Sn (280 pm), and Ir—Sn (280 pm) distances. The lithium atoms connect the polyanionic [ T Sn 4 ] layers. They are located in square prismatic voids formed by tin atoms. The crystal chemistry and chemical bonding of these stannides is briefly discussed.