Solvation dynamics of coumarin 480 in reverse micelles. Slow relaxation of water molecules

被引:281
作者
Sarkar, N [1 ]
Das, K [1 ]
Datta, A [1 ]
Das, S [1 ]
Bhattacharyya, K [1 ]
机构
[1] INDIAN ASSOC CULTIVAT SCI,DEPT PHYS CHEM,CALCUTTA 700032,W BENGAL,INDIA
关键词
D O I
10.1021/jp953658l
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 picosecond time-resolved Stokes shift of the laser dye coumarin 480 (I) is studied in Aerosol OT-heptane reverse micelles at various concentrations of water. On addition of water to a n-heptane solution of I containing 0.09 M AOT, the emission spectrum of I exhibits a prominent shoulder at 480 nm which is ascribed to the dye molecules in the water pool of the reverse micelles. In n-heptane, the fluorescence decays of I at short and long wavelengths are identical, which rules out any time-resolved Stokes shift. On addition of water to the AOT/heptane system, the decay at long wavelengths exhibit a distinct growth on the nanosecond time scale. This and the time-dependent Stokes shift indicate that the water molecules in the water pool of the AOT reverse micelles undergo slow relaxation on the nanosecond time scale.
引用
收藏
页码:10523 / 10527
页数:5
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