Effect of conformational heterogeneity on excitation energy transfer efficiency in directly meso-meso linked Zn(II) porphyrin arrays.
We have investigated the overall excitation energy relaxation dynamics in linear porphyrin arrays as well as the energy transport phenomena by attaching an energy acceptor to one end of a linear porphyrin array by using steady state and time-resolved spectroscopic measurements. We have revealed that the solvation dynamics as well as the conformational dynamics contributes significantly to the energy relaxation processes of linear porphyrin arrays. Consequently, long porphyrin arrays no longer serve as good energy transmission elements in donor-acceptor linked systems due to conformational heterogeneities which provide the non-radiative deactivation channels as energy quenchers.
Ahn
Tae Kyu
TK
Department of Chemistry and Center for Ultrafast Optical Characteristic Control, Yonsei University, Seoul 120-749, Korea.
Yoon
Zin Seok
ZS
Hwang
In-Wook
IW
Lim
Jong Kuk
JK
Rhee
Hanju
H
Joo
Taiha
T
Sim
Eunji
E
Kim
Seong Keun
SK
Aratani
Naoki
N
Osuka
Atsuhiro
A
Kim
Dongho
D