Crystal structure of a π-conjugated N-donor ligand-bridged anionic bis-muth(III) iodide one-dimensional coordination polymer.

The crystal structure of a one-dimensional anionic bis-muth(III) iodide coordination polymer, catena-poly[[tri-iodido-bis-muth(III)]-di-μ-iodido-[tri-iodido-bis-muth(III)]-μ-4,7-bis-(pyridin-4-yl)benzo[c][1,2,5]thia-diazole], {(C16H36N)2[Bi2I8(C16H10N4S)]} n , constructed from μ2-iodido-bridged dinuclear [Bi2I8]2- units and the π-conjugated N-donor ligand 4,7-bis-(pyridin-4-yl)benzo[c][1,2,5]thia-diazole (dpbt) is reported. Each BiIII centre adopts a distorted octa-hedral geometry with five iodido ligands and one nitro-gen donor atom. The dinuclear units are linked by dpbt to form infinite chains, with charge balance provided by tetra-n-butyl-ammonium cations. The crystal packing is governed by C-H⋯I hydrogen bonds and C-H⋯π inter-actions, while π-π stacking is suppressed by steric effects. Anionic iodido-bis-muth polymers of this type are rare.