P117
Studies on the electron donating capability of 2,3-dimethylindole in
solvents of different polarity at 296 K".
Manisankar Maiti,
Subrata Sinha and
Tapan Ganguly
Dept. of Spectroscopy, Indian Association for the
Cultivation of Science,
Studies were made on the nature of photoinduced electron transfer (ET)
reactions within an electron donor 2,3-dimethylindole and a newly
synthesized acceptor 2,3-dichloro-3,4-napthoquinone in solvents of different
polarity at the ambient temperature (296 K). From the steady state
electronic absorption spectra, no ground state charge transfer complex was
observed to form. Large negative values of driving energy indicate that ET
reactions play an important role in non-radiative mechanism of donor
fluorescence. Fluorescence quenching of the donor was observed with gradual
increase of acceptor concentration. As no longer wavelength band was found,
it might be speculated that very short-lived radical ions of the reacting
species might be formed as products of the highly exothermic ET reactions.
>From the large overlapping of donor emission and acceptor absorption spectra,
it may be inferred that Forster's type energy transfer takes place
concurrently with ET reactions.
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