Deuterium isotope effect on 4-aminophthalimide in neat water and reverse micelles

Das, Swati ; Datta, Anindya ; Bhattacharyya, Kankan (1997) Deuterium isotope effect on 4-aminophthalimide in neat water and reverse micelles Journal of Physical Chemistry A, 101 (18). pp. 3299-3304. ISSN 1089-5639

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp963054x?prev...

Related URL: http://dx.doi.org/10.1021/jp963054x

Abstract

Picosecond time-resolved emission of 4-aminophthalimide (4-AP) in neat water and D2O and in the water pool of aerosol OT reverse micelles in n-heptane is reported. It is proposed that in protic solvents 4-AP undergoes ultrafast solvent-mediated proton transfer and the emission originates from the proton-transferred species. The abrupt decrease in the emission quantum yield and lifetime of 4-AP in protic solvents is attributed to the reduction in the S1-S0 energy gap in the proton-transferred species. Nearly 4-fold increase in the emission quantum yield (φ f) and lifetime (τf) of 4-AP is observed in neat D2O compared to water. This is ascribed to the retardation of the nonradiative S1 → S0 internal conversion processes on deuteration of the imide proton. In neat water or D2O the solvation dynamics is too fast to be detected using our picosecond setup. However, in the water pool of reverse micelles the relaxation of the water (or D2O) slows down appreciably. The initial component of the solvation dynamics in reverse micelles, in the case of D2O, is observed to be 1.5 times slower than that in the case of H2O.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:5449
Deposited On:18 Oct 2010 09:55
Last Modified:22 Jan 2011 05:56

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