Two mixed-valence compounds have been isolated from copper-cyanide-meen systems, Cu4(CN)5meen2 and Cu2(CN)3meen2·H2O, where meen is N-methylethylenediamine. The former crystallizes as a polymer, in which CuIImeen2 moieties are covalently linked via cyanide bridges to a three-dimensional CuI cyanide-bridged array, while the latter is a binuclear monomer.
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