Title: Crystal structure of Tl<sub>3</sub>Cu<sub>3</sub>Ta<sub>2</sub>S<sub>8</sub>
Abstract:Abstract Tl 3 Cu 3 Ta 2 S 8 has been synthesized from a stoichiometric reaction of the elements in an evacuated quartz glass tube at 1023 K. This compound crystallizes in a new structure type with two...Abstract Tl 3 Cu 3 Ta 2 S 8 has been synthesized from a stoichiometric reaction of the elements in an evacuated quartz glass tube at 1023 K. This compound crystallizes in a new structure type with two formula units in the monoclinic space group C 2. The cell dimensions are a = 19.398(2) Å, b = 5.545(1) Å, c = 7.224(1) Å and β = 96.03(1)° at room temperature. The crystal structure refinement based on 1974 unique reflections and full-matrix least-squares method yielded R = 0.06 ( R w = 0.06). The structure consists of alternating edge sharing [TaS 4 ]- and [Cu(2)S 4 ]-tetrahedra forming infinitely one-dimensional chains along [010]. Two of these chains are linked together by tetrahedrally coordinated Cu(1) atoms, forming triple chains 3 ∞ 1 [Ta 2 Cu(1)Cu(2) 2 S 8 ]. Within a chosen upper limit of 4.3 Å for Tl-S interaction Tl(1) is eightfold coordinated while Tl(2) is tenfold coordinated. The Ta–S distances vary between 2.25(1) Å and 2.36(1) Å, the Cu(1)–S distances between 2.35(1) Å and 2.36(1) Å and the Cu(2)–S distances between 2.34(1) Å and 2.35(1) Å. There are short metal-metal interactions with distances Ta–Cu(1) at 2.78(1) Å, and Ta–Cu(2) at 2.72(1) Å and 2.84(1) Å.Read More
Publication Year: 1997
Publication Date: 1997-06-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 1
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