Gutov O. The molecular design and crystal engineering of viologens and related compounds

The new substituted viologens contained various functional groups (amino, acid, amide), conjugation-extended viologen analogues bearing stilbene motif as a spacer between the conjugated pyridine moieties; fluorine-containing 4,4'-bipyridines; monosalts of 4,4'-bipyridine have been synthesized and studied as a new tectones for the crystal engineering of functional materials. It was shown that the solid-state structure and properties of compounds studied could be tuned by their molecular and crystal structure modification (via exchangance of anion and substituents, involvance the solvent molecules). It was observed that the formation of stacked close ionic pair cation-anion could lead to significant increasing of luminescence intensity.