A systematic approach to methyl cinnamate photodynamics
A systematic approach to methyl cinnamate photodynamics
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DOI：
10.1080/00268976.2020.1811910
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发表时间：
2020-09-01
影响因子：
1.7
通讯作者：
Stavros, Vasilios G.
中科院分区：
文献类型：
--
作者：
Krokidi, Konstantina M.;Turner, Matthew A. P.;Stavros, Vasilios G.
肉桂酸甲酯（MC）是肉桂酸酯家族中的酯。最近的时间分辨气相研究表明，在激发到其第一个单重态pi pi*（1（1）pi pi*）状态时，在10 ps内有初始衰变到最低单重态（1）n pi*（1（1）n pi*）状态，途中trans-cisosomerisation。在本研究中，我们已经实施了时间分辨离子产额（TR-IY）和时间分辨光电子能谱（TR-PES）实验在气相中，以精确地确定1（1）π π * 状态的寿命。我们发现，使用TR-IY和TR-PES，这种寿命类似于4.5 ps。MC还研究了在一个更复杂的环己烷溶液环境中，使用瞬态电子吸收光谱。沿着补充稳态辐射和（1）H NMR研究，这些研究表明，在更复杂的环己烷溶液环境中，反式异构化被保留。
Methyl cinnamate (MC) is an ester within the cinnamate family. Recent time-resolved gas-phase studies have suggested that upon excitation to its first singlet pi pi* (1(1)pi pi*) state, there is initial decay to the lowest lying singlet(1)n pi* (1(1)n pi*) state within 10 ps, en route totrans-cisisomerisation. In the present study, we have implemented time-resolved ion yield (TR-IY) and time-resolved photoelectron spectroscopy (TR-PES) experiments in the gas-phase to precisely determine the lifetime of the 1(1)pi pi* state. We found this lifetime to be similar to 4.5 ps using both TR-IY and TR-PES. MC was also studied in a more complex cyclohexane solution environment, using transient electronic absorption spectroscopy. Along with complementary steady-state irradiation and(1)H NMR studies, these studies demonstrate thattrans-cisisomerisation is preserved in the more complex, cyclohexane solution environment.