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Photodynamics in stable complexes composed of a zinc porphyrin tripod and pyridyl porphyrins assembled by multiple coordination bonds

Title
Photodynamics in stable complexes composed of a zinc porphyrin tripod and pyridyl porphyrins assembled by multiple coordination bonds
Authors
Takai A.Gros C.P.Barbe J.-M.Fukuzumi S.
Ewha Authors
Shunichi Fukuzumi
SCOPUS Author ID
Shunichi Fukuzumiscopus
Issue Date
2010
Journal Title
Physical Chemistry Chemical Physics
ISSN
1463-9076JCR Link
Citation
vol. 12, no. 38, pp. 12160 - 12168
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
A tripod zinc porphyrin (TPZn 3) forms a stable 11 complex with gold(iii) tetra(4-pyridyl)porphyrin (AuTPyP +) and free-base tris(4-pyridyl)porphyrin (2H-Py 3P) in nonpolar solvents. The strong binding of TPZn 3 with AuTPyP + or 2H-Py 3P results from the encapsulation of AuTPyP + or 2H-Py 3P inside the cavity of TPZn 3 through multiple coordination bonds, as indicated by UV-vis-NIR, ESI-MS, 1H NMR, electrochemistry and computational studies. The binding constants of monomer zinc porphyrin (MPZn) with AuTPyP + and 2H-Py 3P drastically decrease as compared with TPZn 3. Detailed photophysical studies have been carried out on these composites using laser flash photolysis as well as emission spectroscopy. The efficient quenching of the singlet excited state of TPZn 3 occurs via a photoinduced electron-transfer pathway in the TPZn 3-AuTPyP + complex. In contrast, energy transfer occurs in the TPZn 3-2H-Py 3P complex due to the smaller driving force of the photoinduced electron-transfer pathway. Neither electron transfer nor energy transfer occurs from MPZn to AuTPyP + under the same experimental conditions due to the small association constant of the monomer zinc porphyrin. © 2010 the Owner Societies.
DOI
10.1039/c0cp00329h
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자연과학대학 > 화학·나노과학전공 > Journal papers
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