title: Excitation-energy migration in self-assembled cyclic zinc(II)-porphyrin arrays: a close mimicry of a natural light-harvesting system.
abstract: The excitation-energy-hopping (EEH) times within two-dimensional cyclic zinc(II)-porphyrin arrays 5 and 6, which were prepared by intermolecular coordination and ring-closing metathesis reaction of olefins, were deduced by modeling the EEH process based on the anisotropy depolarization as well as the exciton-exciton annihilation dynamics. Assuming the number of energy-hopping sites N = 5 and 6, the two different experimental observables, that is, anisotropy depolarization and exciton-excition annihilation times, consistently give the EEH times of 8.0 +/- 0.5 and 5.3 +/- 0.6 ps through the 1,3-phenylene linkages of 5 and 6, respectively. Accordingly, the self-assembled cyclic porphyrin arrays have proven to be well-defined two-dimensional models for natural light-harvesting complexes.
authors.affiliation: Center for Ultrafast Optical Characteristics Control and Department of Chemistry, Yonsei University, Seoul, Korea.
authors.forename: In-Wook
authors.initials: IW
authors.lastname: Hwang
authors.forename: Mira
authors.initials: M
authors.lastname: Park
authors.forename: Tae Kyu
authors.initials: TK
authors.lastname: Ahn
authors.forename: Zin Seok
authors.initials: ZS
authors.lastname: Yoon
authors.forename: Dah Mee
authors.initials: DM
authors.lastname: Ko
authors.forename: Dongho
authors.initials: D
authors.lastname: Kim
authors.forename: Fuyuki
authors.initials: F
authors.lastname: Ito
authors.forename: Yukihide
authors.initials: Y
authors.lastname: Ishibashi
authors.forename: Sazzadur R
authors.initials: SR
authors.lastname: Khan
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Nagasawa
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Miyasaka
authors.forename: Chusaku
authors.initials: C
authors.lastname: Ikeda
authors.forename: Ryoichi
authors.initials: R
authors.lastname: Takahashi
authors.forename: Kazuya
authors.initials: K
authors.lastname: Ogawa
authors.forename: Akiharu
authors.initials: A
authors.lastname: Satake
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Kobuke
mesh_terms: D000042:Absorption; D000475:Alkenes / Q000737:chemistry; D003500:Cyclization; D004735:Energy Transfer; D005454:Fluorescence Polarization; D045342:Light-Harvesting Protein Complexes / Q000737:chemistry*; D008665:Metalloporphyrins / Q000737:chemistry* / Q000528:radiation effects*; D015394:Molecular Structure; D013050:Spectrometry, Fluorescence; D013997:Time Factors
chemical_list: D000475:Alkenes; D045342:Light-Harvesting Protein Complexes; D008665:Metalloporphyrins; C017802:zinc hematoporphyrin