The ground state (μg) and excited state (μe) dipole moments of two coumarin derivatives namely diethyl 2acetamido-2-((3-oxo-3H-benzo[f]chromen-1-yl)methyl)malonate (2DAM) and ethyl2-((7-methyl-2-oxo-2H-chromen-4yl)methyl)-3-oxobutanoate(2EMCO) were estimated in various solvents. The dipole moments were estimated from Lippert, Bakhshiev and Kawaski-Chamma-Viallet equations by using the variation...