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CuClCu2TeS3:  Synthesis, Structure Determination, and Raman Spectroscopic Characterization of a New Zincblende Derivative

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posted on 12.09.1998, 00:00 authored by A. Pfitzner
Pure black CuClCu2TeS3 was prepared by reaction of stoichiometric amounts of CuCl, Cu, Te, and S in evacuated silica ampules. The crystal structure was determined from single crystals at room temperature. The compound crystallizes in the rhombohedral system, space group R3m with a = 7.361(1) Å and c = 10.401(1) Å (hexagonal setting), and Z = 3. Structural considerations and group-subgroup relationships show that CuClCu2TeS3 can be regarded as a new ordered zincblende derivative. In this material copper and sulfur are four-coordinate. By contrast tellurium has a trigonal pyramidal coordination and chlorine is located in a trigonal planar surrounding. Raman spectra are dominated by stretching modes of thiometalate ions [TeS3]2- at νasym = 359 cm-1 and νsym = 336 cm-1, respectively. DTA measurements reveal a peritectic decomposition of CuClCu2TeS3 at 448 °C.