Femtosecond time-resolved photo-absorption studies on the excitation dynamics of chromium(III) porphyrin complexes in solution

Masahiko Inamo; Chie Okabe; Takakazu Nakabayashi; Nobuyuki Nishi; Mikio Hoshino

doi:10.1016/j.cplett.2007.07.079

Femtosecond time-resolved photo-absorption studies on the excitation dynamics of chromium(III) porphyrin complexes in solution

Masahiko Inamo, Chie Okabe, Takakazu Nakabayashi, Nobuyuki Nishi, Mikio Hoshino

PHA - Molecular Pharmaceutical Science

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

6 Citations (Scopus)

Abstract

The electronic relaxation dynamics of the excited states of the chromium(III) tetraphenylporphyrin complexes, [Cr(TPP)(Cl)(L)] (L = H₂O, pyridine, 1-methylimidazole), in toluene were studied by using femtosecond time-resolved absorption spectroscopy. The excited state (⁴T₁) of 1-methylimidazole and pyridine complexes given by a very rapid intersystem crossing from ⁴S₁ to ⁴T₁ decays to establish the ⁴T₁ ⇌⁶T₁ equilibrium in several hundred picoseconds. The ⁴T₁ state of [Cr(TPP)(Cl)(H₂O)] exhibits a biexponential decay composed of the photodissociation process of the axial H₂O ligand and the decay of the photolyzed intermediate to the ground state of [Cr(TPP)(Cl)].

Original language	English
Pages (from-to)	167-172
Number of pages	6
Journal	Chemical Physics Letters
Volume	445
Issue number	4-6
DOIs	https://doi.org/10.1016/j.cplett.2007.07.079
Publication status	Published - 2007 Sept 13

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@article{2d831a1ec85f410bb0d09c488edd8b1a,

title = "Femtosecond time-resolved photo-absorption studies on the excitation dynamics of chromium(III) porphyrin complexes in solution",

abstract = "The electronic relaxation dynamics of the excited states of the chromium(III) tetraphenylporphyrin complexes, [Cr(TPP)(Cl)(L)] (L = H2O, pyridine, 1-methylimidazole), in toluene were studied by using femtosecond time-resolved absorption spectroscopy. The excited state (4T1) of 1-methylimidazole and pyridine complexes given by a very rapid intersystem crossing from 4S1 to 4T1 decays to establish the 4T1 ⇌ 6T1 equilibrium in several hundred picoseconds. The 4T1 state of [Cr(TPP)(Cl)(H2O)] exhibits a biexponential decay composed of the photodissociation process of the axial H2O ligand and the decay of the photolyzed intermediate to the ground state of [Cr(TPP)(Cl)].",

author = "Masahiko Inamo and Chie Okabe and Takakazu Nakabayashi and Nobuyuki Nishi and Mikio Hoshino",

note = "Funding Information: This work was supported by a Grant-in-Aid for Scientific Research (No. 18550052) and {\textquoteleft}Nanotechnology Support Project{\textquoteright} of the Ministry of Education, Science, Sports, and Culture of Japan.",

year = "2007",

month = sep,

day = "13",

doi = "10.1016/j.cplett.2007.07.079",

language = "English",

volume = "445",

pages = "167--172",

journal = "Chemical Physics Letters",

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TY - JOUR

T1 - Femtosecond time-resolved photo-absorption studies on the excitation dynamics of chromium(III) porphyrin complexes in solution

AU - Inamo, Masahiko

AU - Okabe, Chie

AU - Nakabayashi, Takakazu

AU - Nishi, Nobuyuki

AU - Hoshino, Mikio

N1 - Funding Information: This work was supported by a Grant-in-Aid for Scientific Research (No. 18550052) and ‘Nanotechnology Support Project’ of the Ministry of Education, Science, Sports, and Culture of Japan.

PY - 2007/9/13

Y1 - 2007/9/13

N2 - The electronic relaxation dynamics of the excited states of the chromium(III) tetraphenylporphyrin complexes, [Cr(TPP)(Cl)(L)] (L = H2O, pyridine, 1-methylimidazole), in toluene were studied by using femtosecond time-resolved absorption spectroscopy. The excited state (4T1) of 1-methylimidazole and pyridine complexes given by a very rapid intersystem crossing from 4S1 to 4T1 decays to establish the 4T1 ⇌ 6T1 equilibrium in several hundred picoseconds. The 4T1 state of [Cr(TPP)(Cl)(H2O)] exhibits a biexponential decay composed of the photodissociation process of the axial H2O ligand and the decay of the photolyzed intermediate to the ground state of [Cr(TPP)(Cl)].

AB - The electronic relaxation dynamics of the excited states of the chromium(III) tetraphenylporphyrin complexes, [Cr(TPP)(Cl)(L)] (L = H2O, pyridine, 1-methylimidazole), in toluene were studied by using femtosecond time-resolved absorption spectroscopy. The excited state (4T1) of 1-methylimidazole and pyridine complexes given by a very rapid intersystem crossing from 4S1 to 4T1 decays to establish the 4T1 ⇌ 6T1 equilibrium in several hundred picoseconds. The 4T1 state of [Cr(TPP)(Cl)(H2O)] exhibits a biexponential decay composed of the photodissociation process of the axial H2O ligand and the decay of the photolyzed intermediate to the ground state of [Cr(TPP)(Cl)].

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U2 - 10.1016/j.cplett.2007.07.079

DO - 10.1016/j.cplett.2007.07.079

M3 - Article

AN - SCOPUS:34548456880

SN - 0009-2614

VL - 445

SP - 167

EP - 172

JO - Chemical Physics Letters

JF - Chemical Physics Letters

IS - 4-6

ER -

Femtosecond time-resolved photo-absorption studies on the excitation dynamics of chromium(III) porphyrin complexes in solution

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