Solvents as complex environments can induce considerable effects on the physical, chemical, and biological properties of solute molecules. In this work, solvent polarity sensitive characteristics of phenothiazines were studied by using spectroscopic technique. In this case, the interactional behavior of selected samples was investigated by Kamlet-Abboud-Taft and Catalan models. Moreover, the results from the spectroscopic technique provide a proper condition for providing a new method for investigation of environment polarity effects on the molecular first and second order hyperpolarizability. According to the results, solute–solvent specific and nonspecific interactions with different contributions tend to modify the value of molecular hyperpolarizability. In this case, the studies on the contribution of various molecular interactions can indicate some advantages such as decreasing the complexity of investigations on the environment polarity effects on the molecular hyperpolarizability and provide an effective method for controlling molecular first and second order hyperpolarizability. Therefore, the results can give useful information about the capability of selected samples for various applications in optics.
