S2- and S1-states properties of zinc porphyrin polypeptides

S2- and S1-states properties of zinc porphyrin polypeptides

S2- and S1-states properties of zinc porphyrin polypeptides were investigated using various fast spectroscopic techniques. The B band of zinc porphyrin polypeptides showed broadening and shift to the longer wavelength side with the polymerization degree, indicating the interaction between the porphy...

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Veröffentlicht in:Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 2007-05, Vol.188 (2-3), p.346-350
Hauptverfasser: Fujitsuka, Mamoru, Cho, Dae Won, Solladié, Nathalie, Troiani, Vincent, Qiu, Hongjin, Majima, Tetsuro
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container_end_page 350
container_issue 2-3
container_start_page 346
container_title Journal of photochemistry and photobiology. A, Chemistry.
container_volume 188
creator Fujitsuka, Mamoru
Cho, Dae Won
Solladié, Nathalie
Troiani, Vincent
Qiu, Hongjin
Majima, Tetsuro
description S2- and S1-states properties of zinc porphyrin polypeptides were investigated using various fast spectroscopic techniques. The B band of zinc porphyrin polypeptides showed broadening and shift to the longer wavelength side with the polymerization degree, indicating the interaction between the porphyrin units. The lifetime of S2-fluorescence became shorter with increasing the polymerization degree. This phenomenon can be explained by applying the energy gap law to the S2–S1 internal conversion. From the picosecond transient absorption measurements, singlet–singlet annihilation was confirmed, indicating the intrachain singlet energy migration in the polypeptides. The annihilation rate became faster with the polymerization degree because of the shorter distance between the zinc porphyrin units of longer polypeptides.
doi_str_mv 10.1016/j.jphotochem.2006.12.034
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title S2- and S1-states properties of zinc porphyrin polypeptides
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