Tetraethylammonium Dicopper(I) Triiodide and (18-Crown-6)potassium Dicopper(I) Triiodide

Tetraethylammonium triiododicopper(I), (C₈H₂₀N)[Cu₂I₃], and (18-crown-6)potassium triiododicopper(I), [K(C₁₂H₂₄O₆)][Cu₂I₃], crystallize with a polymeric series of edge-sharing Cu₂I₂ rhombs having Cu atoms bridged in pairs by an additional I atom, i.e. catena-poly[[copper(I)-[mu]₂-iodo-copper(I)]-di-[mu]₃-iodo]. The pattern of projection of bridging [mu]₂-I atoms with respect to the polymeric band is up, down, up, down.

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