磁场对离子液体中光化学反应的影响。

The magnetic field effects on photochemical reactions in ionic liquids.

作者信息

Wakasa Masanobu

出版信息

J Phys Chem B. 2007 Aug 16;111(32):9434-6. doi: 10.1021/jp074331a. Epub 2007 Jul 21.

Abstract

The magnetic field effects (MFEs) on photoinduced hydrogen abstraction reactions of benzophenone (BP) with thiophenol (PhSH) in the ionic liquids (ILs) N,N,N-trimethyl-N-propylammonium bis(trifluoromethanesulfonyl) imide (TMPA TFSI), N-methyl-N-propylpyrrolidinium bis(trifluoromethanesulfonyl) imide (P13 TFSI), and N-methyl-N-propylpiperidinium bis(trifluoromethanesulfonyl) imide (PP13 TFSI) were investigated at 296 K by using a nanosecond laser flash photolysis technique under magnetic fields of 0-1.7 T. Large MFEs were observed for the first time in the ILs. In TMPA TFSI, the yield of the benzophenone ketyl radical gradually decreased with increasing magnetic field strength from 0 to 1.7 T, producing a 20% decrease at 1.7 T.

摘要

在296 K下，利用纳秒激光闪光光解技术，在0 - 1.7 T磁场下研究了离子液体N,N,N-三甲基-N-丙基铵双（三氟甲磺酰）亚胺（TMPA TFSI）、N-甲基-N-丙基吡咯烷鎓双（三氟甲磺酰）亚胺（P13 TFSI）和N-甲基-N-丙基哌啶鎓双（三氟甲磺酰）亚胺（PP13 TFSI）中，磁场效应（MFE）对二苯甲酮（BP）与苯硫酚（PhSH）光诱导氢提取反应的影响。首次在离子液体中观察到较大的磁场效应。在TMPA TFSI中，二苯甲酮酮基自由基的产率随着磁场强度从0增加到1.7 T而逐渐降低，在1.7 T时下降了20%。