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  • 03월 02일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제109회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Ultrafast Intramolecular Energy Relaxation Dynamics of Benzoporphyrins Probed by Femtosecond Fluorescence Upconversion

2012년 2월 29일 13시 53분 56초
PHYS.P-521 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 25일 (수요일) 18:00~21:00
저자 및
김표상, 김동호
연세대학교 화학과, Korea

Strenuous research efforts have been focused on developing new types of porphyrin chromophores that display certain characteristics for applications such as molecular photonic devices, artificial photosynthesis and dye-sensitizer solar cell. In this context, the detailed understanding of relationship between structure and photophysical properties is crucial for the fabrication of novel porphyrins targeted for specific applications. In this work, we have investigated the role of fused benzo-rings on electronic structures and the intramolecular energy relaxation dynamics in a series of benzoporphyrins (Bp1, syn-Bp2, anti-Bp2, Bp3 and Bp4) by using femtoseocnd time-resolved fluorescence upconversion technique. Interestingly, despites the same number of fused benzo-rings, while anti-Bp2 shows an obvious splitting of Bx (Qx) and By (Qy) states, syn-Bp2 exhibits degenerate B and Q bands in their absorption spectra. These features provide that anti-Bp2 shows split B and Q bands in the order of By > Bx > Qx > Qy which leads a superimposement of Qx (0,0) and Qy (1,0) bands. This overlap generates a strong coupling between these two states, which results in a direct internal conversion from Bx (0,0) to Qy (0,0). This observation suggests that anti-type fused position of benzo-rings leads to a new mechanism in internal conversion from B to Q state. On the basis of this work, we can obtain further insight into the effect of fused benzo-rings on the photophysical properties of benzoporphyrins, which provides a detailed understanding of the structure-property relationship in a series of benzoporphyrins.