两种室温离子液体中的光致电子转移反应：1-丁基-3-甲基咪唑六氟磷酸盐和1-辛基-3-甲基咪唑六氟磷酸盐。

Photoinduced electron-transfer reactions in two room-temperature ionic liquids: 1-butyl-3-methylimidazolium hexafluorophosphate and 1-octyl-3-methylimidazolium hexafluorophosphate.

作者信息

Vieira Rebecca C, Falvey Daniel E

机构信息

Department of Chemistry and Biochemistry, University of Maryland at College Park, College Park, Maryland 20742, USA.

出版信息

J Phys Chem B. 2007 May 10;111(18):5023-9. doi: 10.1021/jp0630471.

DOI:10.1021/jp0630471

PMID:17474706

Abstract

Photoinduced electron transfer in two room-temperature ionic liquids, 1-butyl-3-methylimidazolium hexafluorophosphate (BMIM-PF(6)) and 1-octyl-3-methylimidazolium hexafluorophosphate (OMIM-PF(6)), has been investigated using steady-state fluorescence quenching of 9,10-dicyanoanthracene with a series of single electron donors. From these fluorescence quenching rates, reorganization energy (lambda) values and k(diff) values can be derived from a Rehm-Weller analysis. In many cases, these fluorescence quenching reactions occur at rates larger than what would be expected based on the Smoluchowski equation. In addition, lambda values of 10.1 kcal/mol and 16.3 kcal/mol for BMIM-PF(6) and OMIM-PF(6), respectively, have been determined.

摘要

利用9,10-二氰基蒽与一系列单电子供体的稳态荧光猝灭，研究了两种室温离子液体1-丁基-3-甲基咪唑六氟磷酸盐（BMIM-PF(6)）和1-辛基-3-甲基咪唑六氟磷酸盐（OMIM-PF(6)）中的光致电子转移。根据这些荧光猝灭速率，可通过雷姆-韦勒分析得出重组能（λ）值和k(diff)值。在许多情况下，这些荧光猝灭反应的发生速率高于基于斯莫卢霍夫斯基方程预期的速率。此外，已分别测定出BMIM-PF(6)和OMIM-PF(6)的重组能值为10.1 kcal/mol和16.3 kcal/mol。