As the largest CuS cluster known to date, [Cu12S8]4⊖ occupies a special position. It is the first copper(I) complex containing exclusively sulfidic ligands that has been isolated. The Ph4P salt is formed on reaction of CuCl2·2H2O with EtS⊖ and Li2S in the presence of Ph4PBr.
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Betz et al. (1984) studied this question.
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