Ultrafast decay dynamics of photoexcited Cu(II)(TMpy-P4) in water solvent
Ultrafast decay dynamics of photoexcited Cu(II)(TMpy-P4) in water solvent
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DOI：
10.1016/s0009-2614(99)00700-9
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发表时间：
1999-08-20
影响因子：
2.8
通讯作者：
Kim, D
中科院分区：
文献类型：
--
作者：
Jeoung, SC;Takeuchi, S;Kim, D
采用飞秒时间分辨吸收光谱研究了纯水中光激发四(4-N-甲基吡啶基)铜(II)卟啉(Cu(II)(TMpy-pd))的弛豫动力学。瞬态吸收光谱及其时间分布显示出强烈的泵浦功率依赖性，反映了水的多光子电离，这可能导致了先前报告中的差异。在低泵浦功率条件下记录时间分辨瞬态吸收光谱以避免多光子效应。经证实，弛豫过程在 100 ps 内完成，表现出 Cu(II)(TMpy-P4) 基态的双指数恢复。提出了水中光激发Cu(II)(TMpy-P4)弛豫动力学的相关机制。 (C) 1999 Elsevier Science B.V. 保留所有权利。
Femtosecond time-resolved absorption spectroscopy was employed to investigate the relaxation dynamics of photoexcited copper(II) tetrakis (4-N-methylpyridyl)porphyrin (Cu(II)(TMpy-pd)) in neat water. The transient absorption spectra and their temporal profiles show a strong pump-power dependence reflecting multiphoton ionization of water, which probably caused the discrepancies in the previous reports. Time-resolved transient absorption spectra were recorded under low pump-power condition to avoid the multiphoton effect. It was confirmed that the relaxation process finishes within 100 ps, exhibiting the double exponential recovery of Cu(II)(TMpy-P4) ground state. The relevant mechanism for the relaxation dynamics of photoexcited Cu(II)(TMpy-P4) in water was proposed. (C) 1999 Elsevier Science B.V. All rights reserved.