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Emil Makovicky, Inger Sotofte, Sven Karup-Moller

The crystal structure of Cu_2.31TeS_0.32 - a condensed cluster compound

The crystal structure of Cu_2.31TeS_0.32, a sulfur-poor member of the solid solution series Cu_61.3Te_18.3S_20.5 - Cu_61.9Te_35.7S_2.36 prepared at 675°C, was determined and refined from single-crystal diffractometer X-ray data (R = 0.044). The quenched statistical cubic structure (a = 14.836(4)Å, space group F4₁32) consists at room temperature of two interpenetrating tetrahedral frameworks of icosahedral tellurium cages which enclose icosahedral clusters of half-occupied Cu positions centred by additional, fully occupied central copper sites. In one subset, statistically occupied sulfur tetrahedra occur in the tellurium cages, centred on this central Cu site.
The Cu_2.31TeS_0.32 structure is a stuffed derivative of Cr₃Si (structure type A13) and shows affinities to the structures of Cu_9.1TeSb₃, the Ag₈GeTe₆ family and some metal clusters, especially [Cu₂₆Se₁₃(PEt₂Ph)₁₄] and [Au₁₃C_l2(PMe₂Ph)₁₀].

Zeitschrift für Kristallographie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0044-2968
Volume: 215, 08/2000
Pages: 475

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