Tetrakis(N-ethyl-9-oxo-4-azonia-5-aza-9H-fluorene) tetra-μ3-iodo-hexa-μ2-iodo-dodecaiodohexabismuthate

The new iodo­bismuthate compound (C13H11N2O)4[Bi6I22] has been synthesized solvothermally by reacting BiI3, Zn(NO3)2·6H2O and 4,5-diaza­fluoren-9-one in a water/ethanol solvent mixture. The asymmetric unit of the compound contains two independent [N-ethyl-4,5-dafo]+ cations and one-half of a centrosymmetric [Bi6I22]4− anion. The average terminal Bi—I, Bi—μ2-I and Bi—μ3-I bond lengths in the anion are 2.8923 (2), 3.1403 (2) and 3.3022 (2) A, respectively.