Abstract
Tl2PbGeS4 was synthetized by fusion of a stoichiometric mixture of Tl2S, PbS, and GeS2, and prolonged heating of the reaction product. A single crystal could be isolated for intensity measurements on an automated four-circle single crystal diffractometer. Tl2PbGeS4 is monoclinic, space group P21/a with a = 8.907(2), b= 9.114(2), c = 10.502(3) Å, β = 94.08(2)°, and Z = 4. The crystal structure was determined by means of standard methods and refined to R = 0.065. The structure is composed of tetrahedral [GeS4]4- anions which are held together by Tl1+ and Pb2+ cations. The GeS4 tetrahedra are only slightly deformed (mean distance Ge-S: 2.220 Å). The Tl atoms are surrounded by eight S atoms at distances ranging from 3.085 to 4.055 Å forming irregular coordination polyhedra. The Pb atom is coordinated by six S atoms in a strongly distorted octahedral arrangement at distances varying from 2.803 to 3.256 A. The Pb atoms and the Tl(2) atoms are alternately situated between slabs of GeS4 tetrahedra parallel to the ab plane. The Tl(l) atoms are found within these slabs located between the GeS4 tetrahedra.
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