Specific deuterium isotope effects on the intramolecular charge-transfer dynamics of 4-(dimethylamino)benzonitrile

被引：6

作者：

Iwase, E

Tomioka, A

Saigusa, H ^{[1
]}

Yagi, M

机构：

[1] Yokohama City Univ, Grad Sch Integrated Sci, Yokohama, Kanagawa 2360027, Japan

[2] Yokohama Natl Univ, Grad Sch Engn, Dept Appl Chem, Yokohama, Kanagawa 2408501, Japan

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2004年 / 6卷 / 14期

关键词：

D O I：

10.1039/b402202e

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The photoinduced charge-transfer (CT) dynamics of 4-(dimethylamino)benzonitrile (DMABN) are studied for methyl-deuterated isotopomers DMABN-d(6) (with two CD(3) groups) and DMABN-h(3)d(3) (with one CH(3) and one CD(3) group) by steady-state and time-resolved fluorescence spectroscopy. The asymmetrically deuterated species DMABN-h(3)d(3) is found to exhibit less CT fluorescence in sufficiently polar solvents than the symmetric isotopomers of DMABN-h(6) and DMABN-d(6). 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.

引用

页码：3852 / 3856

页数：5

共 22 条

[1] Role of intramolecular torsion and solvent dynamics in the charge-transfer kinetics in triphenylphosphine oxide derivatives and DMABN [J].