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Revisiting the Photophysical Properties and Excited Singlet-state Dipole Moments of Several Coumarin Derivatives by Lamine Cisse; Abdoulaye Djande; Martine Capo-Chichi; François Delatre; Adama Saba; Alphonse Tine; Jean-Jacques Aaron is a Chemistry article available to read on EtoBox.
What is Revisiting the Photophysical Properties and Excited Singlet-state Dipole Moments of Several Coumarin Derivatives about?
The solvent effects on the electronic absorption and fluorescence emission spectra of several coumarins derivatives, containing amino, N,N-dimethyl-amino, N,N-diethyl-amino, hydroxyl, methyl, carboxyl, or halogen substituents at the positions 7, 4, or 3, were investigated in eight solvents with various polarities. The first excited singlet-state dipole moments of these coumarins were determined by various solvatochromic methods, using the theoretical ground-state dipole moments which were calculated by the AM1 method. The first excited singlet-state dipole moment values were obtained by the Bakhshiev, Kawski-Chamma-Viallet, Lippert-Mataga, and Reichardt-Dimroth equations, and were compared to the ground-state dipole moments. In all cases, the dipole moments were found to be higher in the excited singlet-state than in the ground state because of the different electron densities in both states. The redshifts of the absorption and fluorescence emission bands, observed for most compounds upon increasing the solvent polarity, indicated that the electronic transitions were of -\* nature.
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- Author
- Lamine Cisse; Abdoulaye Djande; Martine Capo-Chichi; François Delatre; Adama Saba; Alphonse Tine; Jean-Jacques Aaron
- Publisher
- Elsevier Science; Elsevier ; Elsevier Ltd.; Pergamon Press Ltd.; Elsevier BV (ISSN 1386-1425)
- Published
- 2011
- Language
- EN
- Field
- Chemistry (Physical Sciences)