E. Iwase, Azusa Tomioka, H. Saigusa
Jul 13, 2004
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Journal
Physical Chemistry Chemical Physics
Abstract
The photoinduced charge-transfer (CT) dynamics of 4-(dimethylamino)benzonitrile (DMABN) are studied for methyl-deuterated isotopomers DMABN-d6 (with two CD3 groups) and DMABN-h3d3 (with one CH3 and one CD3 group) by steady-state and time-resolved fluorescence spectroscopy. The asymmetrically deuterated species DMABN-h3d3 is found to exhibit less CT fluorescence in sufficiently polar solvents than the symmetric isotopomers of DMABN-h6 and DMABN-d6. The results of fluorescence decay measurements are also reported, which suggest that the rate of backward electron transfer is increased upon asymmetric substitution of the dimethylamino group.