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metal-organic compounds
The structure of the title compound, [Zn(C10H8N2)3]S2O3.7H2O, consists of cations, Zn(bipy)32+ (where bipy = bipyridine), and anions, S2O32−. There is an unusually short SS contact of 3.361 (3) Å between the anions and a complex hydrogen-bonding scheme involving the seven molecules of water of crystallization.