Abstract
A detailed investigation of the absorption and emission characteristics of 2,2′-dipyridylamine (DPyA) and diphenylamine (DPA) has been carried out in different polar and non-polar solvents at room temperature (300 K) and at 77K. A dramatic change in both the characteristics has been observed in DPyA in comparison with DPA. Measured fluorescence and phosphorescence lifetimes and critical study of the absorption and emission spectral data suggest that DPyA is more planar than DPA and its lowest-energy singlet state is of 1L a type containing a little charge transfer character. Evidence of the presence of a 1 nπ ∗ state has been found in DPyA on protonation in the binary mixture of water and sulphuric acid at room temperature.
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Schedule a callMore From: Journal of Photochemistry and Photobiology A: Chemistry
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