A. Sarkar, S. Chakravorti
Apr 27, 1998
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Influential Citations
18
Citations
Journal
Journal of Luminescence
Abstract
Abstract A detailed investigation on the absorption and emission characteristics of 9-phenyl carbazole (PhC) has been carried out in different solvents at room temperature (300 K) and 77 K. Analyses of spectra and radiative/non-radiative rate parameters suggest that the phenyl group at the position 9 in PhC is twisted out of the plane of carbazolo moiety. Quantum mechanical calculations have also been done to identify ground and excited states and to get optimized geometries in S 0 and S 1 levels. In aqueous medium PhC form dimer or higher aggregates even in very dilute solution. Deaggregation is proposed to account for the β-cyclodextrin-induced effects. In highly acidic HCl medium, PhC decomposes to non-fluorescent product(s) through an intermediate fluorescing species.