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Abstract
The electronic absorption spectra of 2-nitrophenol, salicylic acid, 2-aEinophenol, catechol, pyrogallol and gallic acid, have been measured in different solvents. The solvent effects on the spectra have been discussed and the solvent Induced spectral shifts have been analysed as a function of different solvent polarity parameters. Moleculer orbital calculations of the different singlet-singlet and triplet-triplet transitions in these systems have been done using the PPP method.