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SrPtIn, Sr 2 Pt 3 In 4 , and Ca 2 Au 3 In 4 – Alkaline Earth Compounds with Complex Three‐Dimensional [PtIn], [Pt 3 In 4 ], and [Au 3 In 4 ] Polyanions
Author(s) -
Hoffmann RolfDieter,
Pöttgen Rainer
Publication year - 1999
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/(sici)1521-3749(199906)625:6<994::aid-zaac994>3.0.co;2-w
Subject(s) - indium , alkaline earth metal , crystallography , platinum , chemistry , cobalt , materials science , inorganic chemistry , metal , catalysis , biochemistry , organic chemistry
Single phase SrPtIn, Sr 2 Pt 3 In 4 and Ca 2 Au 3 In 4 were prepared by high‐frequency melting of the elements in water‐cooled glassy carbon crucibles. X‐ray diffraction of powders and single crystals yielded Pnma, oP12, a = 758.57(9) pm, b = 451.52(6) pm, c = 846.0(2) pm, w R2 = 0.0937, 467 F 2 values, 20 variables for SrPtIn, P62m, hP36, a = 1465.9(2) pm, c = 448.24(6) pm, w R2 = 0.0722, 1059 F 2 values, 44 variables for Sr 2 Pt 3 In 4 and Pnma, oP36, a = 1463.6(4) pm, b = 443.23(9) pm, c = 1272.3(2) pm, w R2 = 0.0694, 1344 F 2 values, 56 variables for Ca 2 Au 3 In 4 . SrPtIn adopts the TiNiSi type structure. The indium atoms have a distorted tetrahedral platinum coordination. These InPt 4/4 tetrahedra are edge‐ and corner‐shared, forming a three‐dimensional [PtIn] polyanion in which the strontium atoms are embedded. Sr 2 Pt 3 In 4 crystallizes with the Hf 2 Co 4 P 3 type structure with the more electronegative platinum atoms occupying the phosphorus sites while the indium atoms are located on the cobalt positions. Ca 2 Au 3 In 4 is a new site occupancy variant of the YCo 5 P 3 type. Gold atoms occupy the phosphorus sites and indium the cobalt sites, but one cobalt site is occupied by calcium atoms leading to the composition Ca 2 Au 3 In 4 . Common geometrical motifs of both structures are condensed, platinum(gold)‐centered trigonal prisms formed by the alkaline earth and indium atoms. The platinum (gold) and indium atoms form complex three‐dimensional [Pt 3 In 4 ] and [Au 3 In 4 ] polyanions, respectively. The alkaline earth cations are located in distorted hexagonal tubes.