Excitation-energy migration in self-assembled cyclic zinc(II)-porphyrin arrays: a close mimicry of a natural light-harvesting system.
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.
Hwang
In-Wook
IW
Center for Ultrafast Optical Characteristics Control and Department of Chemistry, Yonsei University, Seoul, Korea.
Park
Mira
M
Ahn
Tae Kyu
TK
Yoon
Zin Seok
ZS
Ko
Dah Mee
DM
Kim
Dongho
D
Ito
Fuyuki
F
Ishibashi
Yukihide
Y
Khan
Sazzadur R
SR
Nagasawa
Yutaka
Y
Miyasaka
Hiroshi
H
Ikeda
Chusaku
C
Takahashi
Ryoichi
R
Ogawa
Kazuya
K
Satake
Akiharu
A
Kobuke
Yoshiaki
Y
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
D000475:Alkenes; D045342:Light-Harvesting Protein Complexes; D008665:Metalloporphyrins; C017802:zinc hematoporphyrin