Effect of Solvent on of 4- Phenyl-7-Hydroxy Coumarin - P –Chloro Anilide

Abstract

The absorption and fluorescence emission spectra of 4- phenyl-7-hydroxy Coumarin - p-chloroanilide have been reported in various polar and non polar solvents. The increase in solvent polarity shows the increase in absorption and emission wave length i.e ???^* transition. This indicates the value of excited state dipole moments can’t be calculated using the solvatochromic data. The results are explained in terms of bathochromomic-shift, and possibility of hydrogen bonding.