Multistage exit of excited xanthone from micelles

被引:28
作者
Mohtat, N [1 ]
Cozens, FL [1 ]
Scaiano, JC [1 ]
机构
[1] Univ Ottawa, Dept Chem, Ottawa, ON K1N 6N5, Canada
来源
JOURNAL OF PHYSICAL CHEMISTRY B | 1998年 / 102卷 / 39期
关键词
D O I
10.1021/jp981951q
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 spectroscopic changes of xanthone associated with its exit from micelles following laser excitation occur in three distinct stages. These processes are accompanied by changes in kinetic behavior and spectra. The first stage of this spectral evolution is intersystem crossing (ISC), which is followed by spectral changes in the triplet-triplet absorption spectrum that reflect an increasingly polar environment as the probe moves from the micelle interior to the micellar surface and later to the aqueous bulk phase. In the case of sodium dodecyl sulfate micelles, these three processes occur with lifetimes of 55 ps (ISC), 3.2 ns, and 0.6 mu s; the last two are assigned to diffusion toward the micelle-water interface and actual exit into the aqueous phase, respectively.
引用
收藏
页码:7557 / 7562
页数:6
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