Photophysical Properties of Coumarin 4-(4-Methoxy-Phenoxymethyl)-6-phenyl-chromen-2-one (C23H18O4) and Estimation of Ground-State and Excited- State Dipole Moments by Solvatochromic Approaches

The absorption and emission fluorescent properties of coumarin-4-(4-Methoxy-Phenoxymethyl)-6-phenyl-chromen-2-one-(C23H18O4) (4MPPC) at room temperature are investigated in pure polar and nonpolar solvents. The pure solvents influence on spectral characteristics. This is investigated by applying theories such as the Lippert-Mataga polarity function, Reichardt's microscopic solvent polarity parameter, and Kamlet and Catalan's multiple linear regression techniques. The main role of solute and solvents interactions in pure solvents, particularly dielectric interaction and hydrogen bonding. The computed HOMO and LUMO energies of these compounds indicate that they are chemically active with a tendency for molecular interactions and is supported by the electrostatic potential data. The hydrogen bonding interactions dominate the contribution of dielectric interactions. The electric dipole moments of both the ground state and excited states had been estimated using Solvatochromic method. The value of electric dipole moment of the excited state. We concluded that polar and polar solvents change fluorescent properties of coumarin.