Ultrafast decay dynamics of photoexcited Cu(II)(TMpy-P4) in water solvent

Sae Chae Jeoung, Satoshi Takeuchi, Tahei Tahara, Dongho Kim

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Abstract

Femtosecond time-resolved absorption spectroscopy was employed to investigate the relaxation dynamics of photoexcited copper(II) tetrakis (4-N-methylpyridyl)porphyrin (Cu(II)(TMpy-P4)) 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.

Original languageEnglish
Pages (from-to)369-376
Number of pages8
JournalChemical Physics Letters
Volume309
Issue number5-6
DOIs
Publication statusPublished - 1999 Aug 20

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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