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;