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  • 09월 04일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Energy Transfer Switching of Porphyrin-based Molecular Tweezer

2014년 8월 29일 11시 13분 02초
ORGN.O-3 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 10시 : 30분
유기화학 - Oral Presentation for Young Organic Chemists
저자 및
윤홍식, 장우동*
연세대학교 화학과, Korea

A bisindole-bridged-porphyrin tweezer (1) exhibited unique switching in forward and backward photo-induced energy transfer by specific guest bindings. Among various metal ions, the addition of Cu2+ only caused a change in electronic absorption and fluorescence quenching of 1. MALDI-TOF-MS and FT-IR analyses indicated the formation of stable coordination complex between 1 and Cu2+ (1-Cu(II)). Without Cu2+ coordination, the excitation energy flows from biindole bridge (BB) to porphyrin (PZn), where the energy transfer efficiency was estimated to be 99%. In contrast, the direction of energy flow in 1 was completely reversed by the coordination of Cu2+. The difference in fluorescence quantum yield between 1 and 1-Cu(II) indicates that more than 95% of excitation energy of PZn flows into Cu(II)-coordinated BB. The energy transfer efficiency was further controlled by bidentate ligand coordination onto 1-Cu(II). When pyrophosphate ion was added to 1-Cu(II), the recovery of fluorescence emission from PZn was observed. The quantum mechanical calculations indicated that the Cu(II)-coordinated BB has square planar geometry, which can be distorted to form octahedral geometry due to the coordination of bidentate ligands.