Solvates of Dipyridinoxylene and Methylviologen Halobismuthates: Synthesis, Crystal Structure and Thermal Decomposition

Ten new solvates of hybrid halobismutates of 1,1′-(1,4-phenylenebis(methylene))bis(1-pyridinium)) (dipyridinoxylene) and four solvates of 1,1′-(1,1′-dimethyl-4,4′-bipyridinium (methyl viologen) have been obtained in the course of this work. The products have been characterized by single crystal X-ray diffraction and X-ray phase analyses. The thermal stability of the obtained solvates was studied and the temperatures at which loss of solvent molecules from compounds occurs were determined. Crystal structures of solvates decomposition products were investigated by powder X-ray diffraction analysis with the use of a synchrotron radiation source. It was found that only two products of thermal decomposition of halobismuthates of dipyridinoxylene solvates can be obtained from aqueous solutions. In this connection thermal decomposition of solvates is proposed as a promising method for obtaining new crystalline modifications of hybrid halobismuthates. Crystalline films of methylviologen iodo- and bromobismuthates with a wide light absorption spectrum were obtained by the thermal decomposition of solvates of methyl viologen halobismuthates with the use of an antisolvent on mesoporous and non-mesoporous oxide substrates.