High-pressure studies of rotational dynamics for coumarin 153 in alcohols and alkanes

被引：18

作者：

Ito, N

Kajimoto, O

Hara, K ^{[1
]}

机构：

[1] Kyoto Univ, Res Ctr Low Temp & Mat Sci, Sakyo Ku, Kyoto 6068502, Japan

[2] Kyoto Univ, Grad Sch Sci, Sakyo Ku, Kyoto 6068502, Japan

来源：

JOURNAL OF PHYSICAL CHEMISTRY A | 2002年 / 106卷 / 25期

关键词：

D O I：

10.1021/jp020226j

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：

Subpicosecond fluorescence anisotropy measurements are used to characterize the rotational dynamics of coumarin 153 (C153) at high pressures in a series of alcohol and alkane solvents, Rotational correlation times (tau(R)) are determined as a function of solvent viscosity to reveal the effect of the frictional behavior of the solvent. The results of the viscosity dependence of tau(R) were compared with those predicted by the hydrodynamic model. Bimodal anisotropy decays of excited C 153 are observed only in alcohol solvents. The specific viscosity dependence of tau(R) in alcohols, which is observed when the solvent viscosity is varied by changing the pressure, is discussed on the basis of the pressure dependence on the solute-solvent and solvent-solvent interactions in alcohols.

引用

页码：6024 / 6029

页数：6

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