Donor-Acceptor Styrylpyridines Based on 2-Oxo-4-(perfluoroethyl)-1,2-dihydropyridine-3-carbonitriles: Synthesis and Photophysical Properties in Solution

Five new representatives of donor-acceptor stilbazoles (styrylpyridines) were synthesized based on 2-oxo-4-(perfluoroethyl)-1,2-dihydropyridine-3-carbonitrile. The influence of the position (2-MeO, 3-MeO, and 4-MeO) and the nature of donor groups (MeO, Me₂N) in the styryl part of the molecule on the photophysical parameters of compounds in solution was studied. Pronounced (fluoro)solvatochromism was revealed for the dye containing a 4-dimethylaminostyryl fragment, with absorption maxima located from 403 to 514 nm, and fluorescence maxima are in the range from 479 to 649 nm.