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metal-organic compounds
(15-Crown-5)caesium triiododicopper(I), [Cs(C10H20O5)][Cu2I3], (15-crown-5)potassium triiododicopper(I), [K(C10H20O5)][Cu2I3], and (15-crown-5) rubidium triiododicopper(I), [Rb(C10H20O5)][Cu2I3], are isostructural. They contain a polymeric Cu2I3-1 moiety, catena-poly[[copper(I)-2-iodo-copper(I)]-di-3-iodo], which may be viewed as a series of opposite edge sharing Cu2I2 rhombs, with alternate units bridged by an additional I atom in an up, up, down, down pattern.