3.4. Solvation affects
The emission and absorption characteristics of organic molecules are known to change by the process of solvation. The frequency, shape and intensity of peaks in the spectrum of florescent molecules changes when environment of the molecules changes from gaseous to liquid phase upon using solvents of different polarity [42, 70-75]. The properties of solvents and their interaction with solute molecules are responsible for the changes in electronic and optical properties of the molecules. Abundant studies are available on the relationship of solvent parameters and optical properties of photo-active solute molecules [42, 43, 76]. Different optoelectronic parameters as polarizabilities, refractive indices and electronic permittivity can be calculated by using different strategies developed on the basis of solvent action. Bakhshiev theory [42] is one of these methods to calculate the shift in spectrum upon the solvation by using the following relations;