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

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

doi:10.1016/S0009-2614(99)00700-9

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

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

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

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 language	English
Pages (from-to)	369-376
Number of pages	8
Journal	Chemical Physics Letters
Volume	309
Issue number	5-6
DOIs	https://doi.org/10.1016/S0009-2614(99)00700-9
Publication status	Published - 1999 Aug 20

Bibliographical note

Funding Information:
This work was financially supported by Korea-Japan Exchange Program of Ministry of Education of Japan.

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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10.1016/S0009-2614(99)00700-9

Cite this

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title = "Ultrafast decay dynamics of photoexcited Cu(II)(TMpy-P4) in water solvent",

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.",

author = "Jeoung, {Sae Chae} and Satoshi Takeuchi and Tahei Tahara and Dongho Kim",

note = "Funding Information: This work was financially supported by Korea-Japan Exchange Program of Ministry of Education of Japan.",

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T1 - Ultrafast decay dynamics of photoexcited Cu(II)(TMpy-P4) in water solvent

AU - Jeoung, Sae Chae

AU - Takeuchi, Satoshi

AU - Tahara, Tahei

AU - Kim, Dongho

N1 - Funding Information: This work was financially supported by Korea-Japan Exchange Program of Ministry of Education of Japan.

PY - 1999/8/20

Y1 - 1999/8/20

N2 - 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.

AB - 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.

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JO - Chemical Physics Letters

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

Abstract

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