Effect of conformational heterogeneity on excitation energy transfer efficiency in directly meso-meso linked Zn(II) porphyrin arrays

Tae Kyu Ahn, Zin Seok Yoon, In-Wook Hwang, Jong Kuk Lim, Hanju Rhee, Taiha Joo, Eunji Sim, Seong Keun Kim, Naoki Aratani, Atsuhiro Osuka, Dongho Kim
Journal of Physical Chemistry. B 2005 June 9, 109 (22): 11223-30
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.

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