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제116회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Excited-state intramolecular proton transfer studied by time-resolved electronic and vibrational spectroscopy

등록일
2015년 9월 3일 14시 04분 49초
접수번호
1230
발표코드
PHYS1-5 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
목 15시 : 25분
발표형식
심포지엄
발표분야
물리화학 - Advances in Spectroscopic Investigation of Molecules and Clusters
저자 및
공동저자
방윤수
광주과학기술원(GIST) 물리화학부, Korea
Fluorophores which form the intramolecular hydrogen bonds often exist in two tautomeric forms and an excited state intramolecular proton transfer (ESIPT) can be observed with large Stokes shifts. 1,2-Dihydoxyanthraquinone (alizarin) forms an intramolecular hydrogen bond between a carbonyl and a hydroxyl group in the ground and excited states. Upon photoexcitation, the ESIPT from the hydroxyl to the carbonyl group occurs in ultrafast (< 100 fs) time scales and the dual emission from the locally excited tautomer and the proton-transferred tautomer is observed, especially in nonpolar solvents. In polar solvents, the energy barrier of ESIPT becomes lower thus the emission from the proton transferred tautomer is dominant. In this work, the ESIPT of alizarin and related molecules in various solutions were investigated by steady-state and time-resolved absorption and emission measurements. Femtosecond stimulated Raman spectroscopy was also used to monitor the instantaneous structural changes of molecules in the excited state.

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