Single-molecule spectroscopic investigation of energy migration processes in cyclic porphyrin arrays.
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.
Park
Mira
M
Center for Ultrafast Optical Characteristics Control and Department of Chemistry, Yonsei University, Seoul 120-749, Korea.
Yoon
Min-Chul
MC
Yoon
Zin Seok
ZS
Hori
Takaaki
T
Peng
Xiaobin
X
Aratani
Naoki
N
Hotta
Jun-Ichi
J
Uji-I
Hiroshi
H
Sliwa
Michel
M
Hofkens
Johan
J
Osuka
Atsuhiro
A
Kim
Dongho
D
D046228:Microarray Analysis; D015394:Molecular Structure; D011166:Porphyrins / Q000032:analysis* / Q000737:chemistry*
D011166:Porphyrins