The reaction of some arylcopper(I) complexes with carbon disulphide and bis (diphenylphosphino)methane (dppm), in toluene, affords the trithiocarbonato complex [Cu4(dppm)4(CS3)2], whose structure as the toluene solvate was shown by X-ray analysis to consist of a square arrangement of copper atoms with the dppm ligands bridging the edges; each of the two trithiocarbonate anions is bonded to all the four copper atoms through two sulphur atoms only.
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Lanfredi et al. (1983) studied this question.
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