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Coherent excitation energy transfer within meso-meso linked Zn(Ⅱ) porphyrin array with 5,15-bisphenylethynylated porphyrin acceptor

등록일
2007년 2월 13일 13시 26분 49초
접수번호
1160
발표코드
26P65포 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
금 <발표Ⅳ>
발표형식
포스터
발표분야
물리화학
저자 및
공동저자
이명원, 김희영, 김동호, 심은지
연세대학교 화학과,
We investigated coherence length of fast excitation energy transfer processes in donor-acceptor linked porphyrin arrays by means of the on-the-fly filtered propagator functional path integral method. The donor porphyrin array consists of meso-meso directly linked Zn(Ⅱ) porphyrin units and a 5,15-bisphenylethynylated porphyrin is the acceptor. Based on the simulated dynamics with the optimal potential parameter, details of the EET process are discussed, such as coherence length within the donor arrays. coherence length of porphyrin arrays are correspondence to C-space which shows the deviation between forward and backward paths. Previously, we have shown that the experimental and the effective two state model system, in which coherence length was implicitly defined, provide excellent agreement. In this work, we used extended multi-state models and determine coherence length from the characteristic off-diagonal trajectory pairs that contribute significantly to the transport dynamics. it was found that the energy bias provided by the acceptor state reduces the system coherence for the short-range transfer and it becomes negligible for arrays with more than 4 donor porphyrin units.

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