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| Type |
Poster Presentation |
| Area |
Physical Chemistry |
| Room No. |
Event Hall |
| Time |
4월 20일 (금요일) 11:00~12:30 |
| Code |
PHYS.P-211 |
| Subject |
Substituent Effect on Photoisomerization Dynamics of trans-Stilbene |
| Authors |
Dong-gu Kang, Kyung Chul Woo, Sang Kyu Kim*
Department of Chemistry, Korea Advanced Institute of Science and Technology, Korea
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| Abstract |
Photoisomerization that would change the molecular structure like trans-cis or E/Z isomers is one of the fundamental photochemical reactions. It has been well established that stilbene (or 1,2-diphenylethene) upon S0 → S1 optical transition distorts the ethylenic bond and forms a perpendicular nuclear configuration P with symmetry-breaking S0-S1 interaction. The P state turns ground-state cis isomer via nonadiabatic pathway. Its application using intramolecular torsion of the phenyl groups around the C=C bond serve as a prototype of the molecular rotor.
Here, we have studied time-resolved electronic and vibrational dynamics of stilbene derivatives in acetonitrile solution with transient absorption and resonance femtosecond stimulated Raman spectroscopy. The substituted effects as electron donor and withdrawer from cyano, formyl, and methoxy groups may perturb the pi conjugation and must change the lifetime of the P state and photoisomerization. We will present the comparison of excited-state absorption spectra on the range from UV to Vis region and ultrafast excited Raman stokes spectra of each substituted stilbenes.
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| E-mail |
girder99@kaist.ac.kr |
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121st General Meeting of the KCS