On the distribution of potential wells and its relation to collision-induced dipole moments in nonpolar solvents. - Part I.

The electronic absorption and fluorescence spectra of coumarin and 11 substituted coumarins were measured in several solvents (dioxane, ethyl ether, ethyl acetate, ethanol, dimethylformamide, acetonitrile, and dimethyl sulfoxide). Ground-state dipole moments were determined in dioxane at 298 K. The results were used to obtain the first excited singlet-state dipole moments of the coumarins under study by the solvatochromic shift method (Bakhshiev, Kawski-Chamma-Viallet, McRae, and Suppan correlations). Also, the ground- and the first excited singlet-state dipole moments were calculated using a combination of the PPP method (π-contribution) and the vector sum of the σ-bond and group moments (σ-contribution). In general, the first excited singlet-state dipole moments of the coumarins are noticeably higher than the corresponding ground-state values, indicating a substantial redistribution of theπ-electron densities resulting in a more polar excited state. There is a reasonably good agreement between the calculated and the experimental dipole moments.

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Quantitative treatment of the effect of solvent on the electronic absorption and fluorescence spectra of substituted coumarins: Evaluation of the first excited singlet-state dipole moments

Aaron

Buna

Párkányi

et al. 1995

J Fluoresc

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Dielectric relaxation of benzophenone and some of its derivatives in the liquid state part I: Dimethyl- and chlorobenzophenones as pure liquid and as highly concentrated solutions in nonpolar solvents

Dachwitz

Stockhausen

1988

Journal of Molecular Liquids

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Dielectric Relaxation of Guaiacol in Solution and in ITS Pure Liquid State

Wilke

Stockhausen

1996

Physics and Chemistry of Liquids

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On the distribution of potential wells and its relation to collision-induced dipole moments in nonpolar solvents. - Part I.

Cited by 4 publications

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Quantitative treatment of the effect of solvent on the electronic absorption and fluorescence spectra of substituted coumarins: Evaluation of the first excited singlet-state dipole moments

Quantitative treatment of the effect of solvent on the electronic absorption and fluorescence spectra of substituted coumarins: Evaluation of the first excited singlet-state dipole moments

Dielectric relaxation of benzophenone and some of its derivatives in the liquid state part I: Dimethyl- and chlorobenzophenones as pure liquid and as highly concentrated solutions in nonpolar solvents

Dielectric Relaxation of Guaiacol in Solution and in ITS Pure Liquid State

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