Excitation Energy Migration in A Dodecameric Porphyrin Wheel

Intramolecular excitation energy hopping (EEH) time within a dodecameric porphyrin wheel C6ZA, in which six meso−meso linked zinc(II) diporphyrin (Z2) subunits are bridged by 1,3-phenylene spacers, is deduced by a Förster energy hopping model based on S1−S1 exciton−exciton annihilation and anisotrop...

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Bibliographic Details
Published in:The journal of physical chemistry. B 2005-05, Vol.109 (18), p.8643-8651
Main Authors: Hwang, In-Wook, Ko, Dah Mee, Ahn, Tae Kyu, Yoon, Zin Seok, Kim, Dongho, Peng, Xiaobin, Aratani, Naoki, Osuka, Atsuhiro
Format: Article
Language:English
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Summary:Intramolecular excitation energy hopping (EEH) time within a dodecameric porphyrin wheel C6ZA, in which six meso−meso linked zinc(II) diporphyrin (Z2) subunits are bridged by 1,3-phenylene spacers, is deduced by a Förster energy hopping model based on S1−S1 exciton−exciton annihilation and anisotropy depolarization. Under the assumption that the energy hopping sites are six Z2 subunits, two different observables (e.g., exciton−exciton annihilation and anisotropy depolarization times) consistently give the EEH time of 4.0 ± 0.4 ps via 1,3-phenylene spacer of C6ZA, which is faster than 9.4 ps of linear 2Z2 (1,3-phenylene-linked zinc(II) tetraporphyrin). As a consequence, C6ZA serves as a well-defined two-dimensional model for a light-harvesting complex.
ISSN:1520-6106
1520-5207
DOI:10.1021/jp044274a