A mixed-valence CuII/CuI anion-cation complex:: bis[μ-5-sulfosalicylato(3-)]bis[(di-2-pyridylamine)-copper(II)] bis[bis(di-2-pyridylamine)copper(I)] dihydrate

The title compound, [Cu-2(II)(C7H3O6S)(2)(C10H9N3)(2)][Cu-I(C10H9N3)](2)center dot 2H(2)O, consists of anionic Cu-II moieties, cationic Cu-I species and uncoordinated water molecules. The anionic dimeric unit consists of one crystallographically independent fully deprotonated 5-sulfosalicylate (2-oxido-5-sulfonatobenzoate) anion, a di-2-pyridylamine group and a Cu-II atom. Each Cu-II atom is five-coordinate within a square-pyramidal geometry. The anion lies on a special position of (1) over bar site symmetry. In the cationic monomer, the Cu-I atom adopts tetrahedral geometry. The cations and anions are connected by O-H center dot center dot center dot O and N-H center dot center dot center dot O hydrogen bonds.