期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 23, 期 9, 页码 5236-5243出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0cp06104b
关键词
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资金
- National Natural Science Foundation of P. R. China [21673085, 21773075]
- Ministry of Science and Technology, Taiwan [MOST 109-2113-M-009-019]
- Ministry of Education, Taiwan [109W307]
Global switching on-the-fly trajectory surface hopping molecular dynamics simulation was performed to investigate the photoisomerization mechanisms of E-to-Z and Z-to-E transitions using accurate potential energy surfaces. The study found different types of conical intersections to determine the photoisomerization mechanisms, shedding light on the photoinduced isomerization in large NAIP systems.
Global switching on-the-fly trajectory surface hopping molecular dynamics simulation was performed on the accurate TD-B3LYP/6-31G* potential energy surfaces for E-to-Z and Z-to-E photoisomerization of dMe-OMe-NAIP up to S-1(pi pi*) excitation. The present TD(DFT) simulation provides accurate calculation for conical intersections between the first-excited and ground states. Thus, simulated quantum yield and lifetime of 0.23 and 620 fs (0.15 and 600 fs) for E-to-Z (Z-to-E) isomerization are in good (relatively good) agreement with experimental observation of 0.25 and 480 fs (0.24 and 430 fs), respectively. Simulated results reveal that photoisomerization pathways are initially uphill to conical intersection zones on the S-1 potential energy surface and then downhill to product zones. Three types of representative conical intersections are found for determining photoisomerization mechanisms: one is the rotation type responsible for reactive isomerization and the other two are close to E and Z configurations, respectively, only for nonreactive isomerization. The present conclusions can be held in general for similar large NAIP systems of photoinduced isomerization based on E and Z configurations.
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