Investigation on environmental sensitivity characteristics of pyridine compounds with different position of N-atoms and various active functional groups

Environment induced effects including polarity play important role in controlling physical, biological, and chemical behavior of local molecules. In this study, due to the importance of this issue, solvatochromism and charge transfer characteristics of some groups of pyridine compounds were investigated in various environments with different polarity. According to the experimental results, polarity of molecular surrounding environment, position of N-atom in pyridine rings, and various active functional groups have profound effects on the molecular photo-physical features. The contribution of various solvent induced effects on the solvatochromism characteristics of samples were also investigated by using of linear salvation energy relationship concept. Moreover, according to the experimental data and density functional theory calculations, the differences between molecular dipole moment values in the ground and excited states are high enough to increase the probability of charge transfer mechanism. Therefore, from the theoretical calculations and quantitative experimental results of solute-solvent various interactions� contributions, it is possible to estimate the operation of pyridine compounds in various physical, chemical and biological phenomena in the solvent media. © 2018 Elsevier B.V