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Syntheses, Structures, and Properties of New Quaternary Gold‐Chalcogenides: K 2 Au 2 Ge 2 S 6 , K 2 Au 2 Sn 2 Se 6 , and Cs 2 Au 2 SnS 4
Author(s) -
Löken Sandra,
Tremel Wolfgang
Publication year - 1998
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(199810)624:10<1588::aid-zaac1588>3.0.co;2-x
Subject(s) - monoclinic crystal system , orthorhombic crystal system , crystallography , crystal structure , tetragonal crystal system , chemistry , stannate , single crystal , stereochemistry , zinc , organic chemistry
The new compounds K 2 Au 2 Ge 2 S 6 ( 1 ), K 2 Au 2 Sn 2 Se 6 ( 2 ), and Cs 2 Au 2 SnS 4 ( 3 ) have been synthesized through direct reaction of the elements with a molten polyalkalithiogermanate(stannate) flux at 650, 550, and 400 °C, respectively. Their crystal structures have been determined by single crystal X‐ray diffraction techniques. 1 crystallizes in the monoclinic space group P2 1 /n with a = 10.633(2) Å, b = 11.127(2) Å, c = 11.303(2) Å, β = 115,37(3)°, V = 1208,2(3) Å 3 and Z = 4, final R(Rw) = 0.045(0.106). 2 crystallizes in the tetragonal space group P4/mcc with a = 8.251(1) Å, c = 19.961(4) Å, V = 1358,9(4) Å 3 and Z = 4, final R(Rw) = 0.040(0.076). 3 crystallizes in the orthorhombic space group Fddd with a = 6.143(1) Å, b = 14.296(3) Å, c = 24.578(5) Å, V = 2158.4(7) Å 3 and Z = 4, final R(Rw) = 0.039(0.095). The structures of 1 , 2 , and 3 consist of infinite, one‐dimensional anionic chains containing X 2 Q 6 4– units linked by Au + ions and charge balancing K + /Cs + ions situated between the chains. All compounds were investigated with differential thermal analysis, FT‐IR, and solid state UV/VIS diffuse reflectance spectroscopy.