Tetra- and Pentanuclear Iodobismuthates with the Cation Based on 2,3,5,6-Tetramethylpyrazine: Syntheses and Crystal Structures

Complexes (HTMP) 4 [Bi 4 I 16 ] · 2H 2 O · 2(CH 3 ) 2 CO ( I ) and (HTMP) 3 [Bi 5 I 18 ] · 5THF ( II ) have been synthesized by the reactions of BiI 3 and 2,3,5,6-tetramethylpyrazine (TMP) in acetone and tetrahydrofuran (THF), respectively. The crystal structures of both compounds were determined by X-ray diffraction analysis (СIF files CCDC nos. 1817306 ( I ) and 1817307 ( II )). In both cases, the complexes in the solid state feature supramolecular contacts between the π systems of the cations and iodide ligands of the anions.