One- and Two-Dimensional Iodine-Rich lodobismuthate(III) Complexes: Structure, Optical Properties, and Features of Halogen Bonding in the Solid State

Reactions of BiI3, I-2, and iodide salts of two different pyridinum cations result in the formation of the novel iodine-rich iodobismuthates(III) (1,3-MePy)(4){[Bi4I16](I-2)} (1) and (1-MePy){[BiL4](I-2)(0.5)) (2), where the halometalate anions are connected by diiodine linkers into one- or two-dimensional supramolecular structures. Both complexes reveal narrow optical band gaps and fairly high thermal stability, favoring their potential use in photovoltaic devices.