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제120회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Solvent Polarity Effect on Exciplex Conformation on Linked Electron D-A Molecules

등록일
2017년 8월 31일 17시 44분 37초
접수번호
2472
발표코드
PHYS.P-232 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
10월 20일 (금요일) 13:00~14:30
발표형식
포스터
발표분야
Physical Chemistry
저자 및
공동저자
Dongkyum Kim, Hohjai Lee1,*
Department of Chemistry, Gwangju Institute of Science and Technology, Korea
1Chemistry, Gwangju Institute of Science and Technology, Korea
In photo-induced electron transfer (PET) strong interaction of excited acceptor-donor pair produces radical ion pair (RIP) or excited state charge-transfer complexes, which is called exciplex. Generation of RIP or exciplex is dependent on solvent polarity. Exciplex emission band of pyrene-(CH2)12-O-(CH2)2-N,N-dimethylaniline was observed to decrease in intensity and be red-shifted with solvent polarity. This type of behavior is explained by solvent polarity effect in electronic structure of exciplex. We assume that polar solvent transform exciplex conformation from planar structure into twisted like intramolecular charge transfer structure. In order to search for transformation of exciplex we synthesized pyrene-COO-(CH2)11-O-(CH2)2-N,N-dimethylanilline and we observed that difference between two molecules in degree of charge separation in a same polar solvent. Quantum mechanical calculation provided corresponding molecular structures. Our assumption of the solvent polarity effect on the exciplex conformation was tested by synthesizing pyrene-(CH2)12-O-(CH2)2 –julolidine which was twisted conformation was prohibited.

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