Abstract
Herein, we have studied the photophysical properties for three newly synthesized coumarin derivatives; 4-((2,6-dibromo-4-methylphenoxy)methyl)-2H-benzo[h]chromen-2-one (DMB), 4-((3,4-dihydro-6,7-dimethoxyisoquinolin-1-yl)methyl)-6-methyl-2H-chromen-2-one (DIM) and 4-((p-tolyloxy)methyl)-6-methoxy-2H-chromen-2-one (TMC). The absorption and emission spectra for above said molecules were recorded in different solvents at room temperature in order to calculate their ground and excited state dipole moments. The ground (μ g ) and excited state dipole (μ e ) moments of these coumarin derivatives were calculated using Lippert’s, Bakshiev’s and Kawski-Chamma-Viallet’s equations by the solvatochromic shift method, which involves a variation of Stokes shift with the solvent dielectric constant and refractive index. Ground state dipole moments (μ g ) were also calculated from the Guggenheim method using the dielectric constant and refractive index of the solute molecule. The value of ground state dipole moment obtained from these two methods is well correlated. Further, it is notified that the excited state dipole moment is larger than the ground state dipole moment for all three solute molecules. It inferred that the excited state for above said molecules is more polar than the ground state. The present investigations may shine in the design of nonlinear optical materials.
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Authors are thankful to the technical staff of USIC, Karnatak University Dharwad for recording absorption and fluorescence spectra.
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Sidarai, A.H., Desai, V.R., Hunagund, S.M. et al. Study of Photophysical Properties on Newly Synthesized Coumarin Derivatives. J Fluoresc 27, 2223–2229 (2017). https://doi.org/10.1007/s10895-017-2163-6
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DOI: https://doi.org/10.1007/s10895-017-2163-6