The polarity of an environment can modify molecular optical characteristics. In this study, the spectroscopy and DFT methods were applied to study environment effects. Multi-parameter models based on polarity factors were used. In addition, spectroscopic data were applied to determine the nonlinear optical properties of Indan-1-one compounds in different environments. The experimental results emphasize the importance of the dipolarity/polarizability parameter in hyperpolarizability of samples in similar behavior to their linear optical behavior. Hence, the studies on the nature of a solvent environment and its effects on the linear responses of Indan-1-one compounds provide an effective way to estimate the dominant solvent polarity effects on the nonlinear hyperpolarizability of the studied molecules. On the other hand, Indan-1-one compounds with their good nonlinear properties can be used in various optical phenomena.
