Tetrakis(2,3,5,6-tetramethylpyrazinium) Tetra-[mu]₃-iodo-hexa-[mu]-iodo-dodecaiodohexaantimonate(4-) Tetrahydrate

The title compound, (C₈H₁₃N₂)₄.[Sb₆I₂₂].4H₂O, crystallizes with an Sb₆I₂₂^4- anion consisting of edge-shared distorted octahedra [Sb-I_range = 2.789 (2)-3.421 (2) Å] and monoprotonated tetramethylpyrazinium cations which are bridged by water solvent molecules to form infinite chains [N...O = 2.69 (1)-2.95 (1) Å]. The anion has a structure corresponding to a section from a layer of the CdI₂ structure, similar to that previously observed when crystallized with a bis(cyclopentadiene)iron(III) cation [Pohl, Lotz, Saak & Haase (1989). Angew. Chem. Int. Ed. Engl. 28, 344-345].

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