Local structure of ionic liquids probed by self-quenching of thiobenzophenone

文献情報

出版日 2012-11-14

DOI 10.1039/C2CP42766D

インパクトファクター 3.676

著者

Miyuki Tanaka, Tomoaki Yago, Masanobu Wakasa

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要旨

Self-quenching of the triplet excited state of thiobenzophenone (3TBP*) in molecular solvents, a sodium dodecyl sulfate (SDS) micellar solution, and ionic liquids (ILs) was measured using nanosecond laser flash photolysis. In the molecular solvents and ILs, 3TBP* single-exponentially decayed, and the decay was accelerated with increasing TBP concentration. Self-quenching rate constants (kSQ) obtained in the ILs were smaller than those in the molecular solvents with similar solvent viscosities, indicating that molecular diffusion is inhibited in the ILs. In the SDS micellar solution, the decay of 3TBP* showed two components. The fast decay component was attributed to self-quenching of 3TBP* which presents inside micelles containing two or more TBP molecules, while the slow decay component was from deactivation of single 3TBP*. The decay of 3TBP* in an IL, N,N,N-trimethyl-N-propylammonium bis(trifluoromethylsulfonyl)amide (TMPA TFSA), had only one decay component, showing that unlike the micelles, the local structure of TMPA TFSA does not have a long lifetime. The cage lifetime of TMPA TFSA was estimated to be between 17 and 20 ns.

掲載誌

Physical Chemistry Chemical Physics

CiteScore: 5.5

自己引用率: 10.3%

年間論文数: 3036

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