Author:
Traore Hassimi,Saunders Michael,Blasiman Scott
Abstract
The ultraviolet (u.v.) and fluorescence spectra and relative fluorescence
intensities of 1-methyl-2(1H)-pyridinimine (1-MIP) and
1,2-dimethylpyridinimine (2-MIP) were measured in several solvents at room
temperature. The solvents’ effect on the absorption and fluorescence
spectra of MIP indicates that the ππ* transition shifts to higher
energies (shorter wavelengths) are due to solvents’ interactions and the
formation of the pyridinium cation. One major difference in the u.v. and
fluorescence spectra is the small relative intensity in non-polar solvents.
This was attributed to the proximity effect of ππ* and nπ*
states which can lead to vibronic interactions, and to distortions of the
excited-state potential surfaces. In polar solvents, however, these two states
are shifted in energy due to solvent–solute interactions, which decrease
the energy of the potential surface.
Cited by
10 articles.
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