Excitation energy transport processes of porphyrin monomer, dimer, cyclic trimer, and hexamer probed by ultrafast fluorescence anisotropy decay

被引:148
作者
Cho, HS
Rhee, H
Song, JK
Min, CK
Takase, M
Aratani, N
Cho, S
Osuka, A [1 ]
Joo, T
Kim, D
机构
[1] Kyoto Univ, Grad Sch Sci, Dept Chem, Kyoto 6068502, Japan
[2] Yonsei Univ, Natl Creat Res Initiat Ctr Ultrafast Opt Characte, Seoul 120749, South Korea
[3] Yonsei Univ, Dept Chem, Seoul 120749, South Korea
[4] Pohang Univ Sci & Technol, Dept Chem, Pohang 790784, South Korea
关键词
D O I
10.1021/ja021476g
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Femtosecond fluorescence anisotropy measurements for a variety of cyclic porphyrin arrays such as Zn(II)porphyrin m-trimer and hexamer are reported along with o-dimer and monomer as reference molecules. In the porphyrin arrays, a pair of porphyrin moieties are joined together via triphenyl linkage to ensure cyclic and rigid structures. Anisotropy decay times of the porphyrin arrays can be well described by the Forster incoherent excitation hopping process between the porphyrin units. Exciton coupling strengths of 74 and 264 cm(-1) for the m-trimer and hexamer estimated from the observed excitation energy hopping rates are close to those of B800 and B850, respectively, in the LH2 bacterial light-harvesting antenna. Thus, these cyclic porphyrin array systems have proven to be useful in understanding energy migration processes in a relatively weak interaction regime in light of the similarity in overall structures and constituent chromophores to natural light-harvesting arrays.
引用
收藏
页码:5849 / 5860
页数:12
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