物理化学学报 >> 2017, Vol. 33 >> Issue (11): 2191-2198.doi: 10.3866/PKU.WHXB201705242

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离子液体[Bmim][BF4]中卟啉的三线态动力学

马仁君1,2,郭前进1,2,李博轩1,2,*(),夏安东1,2,*()   

  1. 1 中国科学院化学研究所,北京分子科学国家实验室,光化学重点实验室,北京100190
    2 中国科学院大学,北京100049
  • 收稿日期:2017-05-04 发布日期:2017-08-25
  • 通讯作者: 李博轩,夏安东 E-mail:lbx1984@iccas.ac.cn;andong@iccas.ac.cn
  • 基金资助:
    国家自然科学基金(21333012);国家自然科学基金(21673252);国家自然科学基金(21373232)

Triplet Excited State Dynamics of Porphyrin in Ionic Liquid [Bmim][BF4]

Ren-Jun MA1,2,Qian-Jin GUO1,2,Bo-Xuan LI1,2,*(),An-Dong XIA1,2,*()   

  1. 1 Key Laboratory of Photochemistry, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
    2 University of Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2017-05-04 Published:2017-08-25
  • Contact: Bo-Xuan LI,An-Dong XIA E-mail:lbx1984@iccas.ac.cn;andong@iccas.ac.cn
  • Supported by:
    the National Natural Science Foundation of China(21333012);the National Natural Science Foundation of China(21673252);the National Natural Science Foundation of China(21373232)

摘要:

室温离子液体由于其几乎不挥发、稳定性突出、良好的电化学性能以及结构与性能的可设计性等优点,在诸多领域得到了深入的研究和广泛的应用。与传统的普通溶剂不同,离子液体的本质特点之一是其内部的微观结构具有微不均匀性。本文通过对四苯基卟啉(TPP)分子在离子液体[Bmim][BF4]中的三线态动力学研究,发现在激光作用下,TPP的三线态寿命由2.95 μs显著增加到184 μs。进一步分析表明,这一现象很可能是由于离子液体的微结构在激光诱导下发生变化,被激光场或者离子诱导极化的氧气分子在离子液体微不均匀性环境中发生重新分布而引起的。

关键词: 离子液体, 微不均匀性结构, 分子探针, 三线态动力学, 卟啉

Abstract:

Room temperature ionic liquids (RTILs) have been extensively studied with various applications owing to their non-volatility, excellent stability, good electrochemical properties and they can be easily manipulated by designing an appropriate structure and property. They differ from conventional solvents in that they have structural heterogeneity, which is one of the most essential natures of RTILs. In this work, the triplet excited state dynamics of meso-tetraphenylporphyrin (TPP) in the ionic liquid [Bmim][BF4] were studied, and it was observed that the triplet state lifetime of TPP increases remarkably from 2.95 to 184 μs upon laser irradiation. These results of the dynamics of TPP triplet excited state are probably caused by the laser-induced microstructure changes of the ionic liquid, and the redistribution of oxygen molecules polarized by the external laser field and/or the ions in the heterogeneous microenvironment of the ionic liquid upon laser irradiation.

Key words: Ionic liquid, Structural heterogeneity, Molecular probe, Triplet state dynamics, Porphyrin

MSC2000: 

  • O643