title: Single-molecule spectroscopic investigation of energy migration processes in cyclic porphyrin arrays.
abstract: Covalently linked cyclic porphyrin arrays have been synthesized to mimic natural light-harvesting apparatuses and to investigate the highly efficient energy migration processes occurring in these systems for future applications in molecular photonics. To avoid an ensemble-averaged picture, we performed a single-molecule spectroscopic study on the energy migration processes of cyclic porphyrin arrays and a linear model compound embedded in a rigid polymer matrix by recording fluorescence intensity trajectories, by performing coincidence measurements, and by doing wide-field defocused imaging. Our study demonstrates efficient energy migration within the cyclic porphyrin arrays at the single-molecule level. By comparison with the data of the linear model compound, we could pinpoint the role of the dipole-dipole coupling between diporphyrin subunits and the rigidity of the cyclic structures on the energy transfer processes.
authors.affiliation: Center for Ultrafast Optical Characteristics Control and Department of Chemistry, Yonsei University, Seoul 120-749, Korea.
authors.forename: Mira
authors.initials: M
authors.lastname: Park
authors.forename: Min-Chul
authors.initials: MC
authors.lastname: Yoon
authors.forename: Zin Seok
authors.initials: ZS
authors.lastname: Yoon
authors.forename: Takaaki
authors.initials: T
authors.lastname: Hori
authors.forename: Xiaobin
authors.initials: X
authors.lastname: Peng
authors.forename: Naoki
authors.initials: N
authors.lastname: Aratani
authors.forename: Jun-Ichi
authors.initials: J
authors.lastname: Hotta
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Uji-I
authors.forename: Michel
authors.initials: M
authors.lastname: Sliwa
authors.forename: Johan
authors.initials: J
authors.lastname: Hofkens
authors.forename: Atsuhiro
authors.initials: A
authors.lastname: Osuka
authors.forename: Dongho
authors.initials: D
authors.lastname: Kim
mesh_terms: D046228:Microarray Analysis; D015394:Molecular Structure; D011166:Porphyrins / Q000032:analysis* / Q000737:chemistry*
chemical_list: D011166:Porphyrins