Abstract
The present paper deals with the spectroscopic study of coumarin 540 A in sol-gel and other liquid solvents in the 190–500 nm wavelength region. The electronic absorption spectra are compared with coumarin and its parent aromatic molecule anthracene. Theoretically, ground state geometries are optimized using the MNDO molecular orbital method. The electronic energy levels have been calculated using the optimized geometries and the CNDO/S-CI method. The role of the sol-gel matrix and the effect of hydrogen bonding is discussed in order to explain the observed spectral characteristics.
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