Photoisomerization of 2-styrylquinoline in neutral and protonated forms
作者： M. F. Budyka , N. I. Potashova , T. N. Gavrishova , V. M. Li
DOI: 10.1134/S0018143908060052
关键词: Protonation 、 Computational chemistry 、 Photoisomerization 、 Diabatic 、 Chemistry 、 Moiety 、 Photochemistry 、 Conformational isomerism 、 Quantum yield 、 Quantum 、 Potential energy surface
摘要: The quantum yields of the trans-cis and cis-trans photoisomerization 2-styrylquinoline (2SQ) its several derivatives were measured in neutral, protonated, quaternized forms. It was shown that electron-donor substituents styryl moiety increase yield photoisometization ϕtc neutral form as a result stabilization intermediate zwitterionic perpendicular conformer. On passing from to positively charged forms (protonated or quaternized), an > 0.5 observed, thus suggesting terms classical diabatic mechanism via conformer shift minimum on potential energy surface (PES) S1 state relative maximum S0 PES cis-isomer possible contribution adiabatic route 2SQ cations.
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