Dynamic solvation in imidazolium-based ionic liquids on short time scales

被引：59

作者：

Headley, Lindsay Sanders ^{[1
]}

Mukherjee, Prasun ^{[1
]}

Anderson, Jared L. ^{[1
]}

Ding, Rongfang ^{[1
]}

Halder, Mintu ^{[1
]}

Armstrong, Daniel W. ^{[1
]}

Song, Xueyu ^{[1
]}

Petrich, Jacob W. ^{[1
]}

机构：

[1] Iowa State Univ, Dept Chem, Ames, IA 50011 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY A | 2006年 / 110卷 / 31期

关键词：

D O I：

10.1021/jp0606964

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：

Steady-state and time-resolved Stokes shift data for the probe coumarin 153 in two imidazoles, six imidazolium-based ionic liquids, and several other solvents are presented. These results are consistent with our original suggestion (J. Phys. Chem. B 2004, 108, 10245- 10255) that initial solvation is dominated by the organic moiety of the ionic liquid, and they show that for the imidazole-based liquids initial solvation is in all cases very rapid. Solvation by methylimidazole and butylimidazole is complete in 100 ps, and all of the imidazolium ionic liquids demonstrate similarly rapid initial solvation. Owing to the importance of determining the amount of initial solvation that is missed in a given experiment with finite time resolution, we discuss a method of estimating the intramolecular contribution to the reorganization energy. This method yields 2068 cm(-1) and is compared with an alternative method.

引用

页码：9549 / 9554

页数：6

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