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제123회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Time-resolved Structural Dynamics of para-Halogen-disubstituted trans-Stilbene

2019년 2월 14일 16시 58분 50초
PHYS.P-210 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 19일 (금요일) 11:00~12:30
Physical Chemistry
저자 및
Dong-gu Kang, Chan Ho Park1, David W. McCamant2, Sang Kyu Kim*
Department of Chemistry, Korea Advanced Institute of Science and Technology, Korea
1Korea Advanced Institute of Science and Technology, Korea
2Department of Chemistry, University of Rochester, United States
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승인 1건
We have studied the photoisomerization reaction of 4,4'-dichloro-trans-stilbene (44DChtS) and 4,4'-dibromo-trans-stilbene (44DBrtS) in the condensed-phase with femtosecond transient absorption and femtosecond stimulated Raman spectroscopy. Coherent oscillation features were observed in the excited-state absorption signal and the frequencies of the coherent motion showing the in-plane bending mode at 150 cm-1 (44DChtS) and 120 cm-1 (44DBrtS) are induced by para-halogen-disubstituent. In n-hexane (acetonitrile), photoisomerization lifetime of 44DChtS and 44DBrtS are 314 (124) ps and 85 (65) ps, respectively. In the case of 44DBrtS, we expect another C-Br bond dissociation reaction pathway since TD-DFT calculation shows the low dissociation barrier of C-Br coordinate compared to that of C-Cl. Also, we observed that the C=C stretching mode of transient Raman spectra (1550 cm-1) depends on the excess energy of excitation pulse. Therefore, we will present the time-resolved structural dynamics of S1 state in 44DChtS and 44DBrtS comparing the substituent effect to that of trans-stilbene.