Evaluation of proton transfer reactions in an ionic plastic crystal

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  • イオン性柔粘性結晶中でのプロトン移動反応の評価
  • イオンセイ ジュウネンセイ ケッショウチュウ デノ プロトン イドウ ハンノウ ノ ヒョウカ

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Proton transfer reactions of various photoacids or photobases in 1-methylimidazolium triflate ([HMIM][TfO]) has been studied by steady-state fluorescence spectroscopy and time-resolved fluorescence spectroscopy. The fluorescence and excitation spectra of 2-aminopyridine and 6-hydroxyquinoline indicated a high acidity of [HMIM][TfO]. We also observed the proton transfer from trisodium 8-hydroxypyrene-1,3,6-trisulfonate (HPTS) to 1-methylimidazole (MIM) or water added to [HMIM][TfO] as co-solvent. The fluorescence excitation spectra indicated that the existence of the complex between HPTS and MIM. The fluorescence dynamics indicated that the site selective proton transfer occurred in solid [HMIM][TfO]. In a PC phase, such an unique process was not observed, suggesting that the rotational dynamics in PC was similar to that in liquids phase.

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