I found the field of Chemistry; Physics very interesting. Saw the article The direct observation of the doorway (1)n pi* state of methylcinnamate and hydrogen-bonding effects on the photochemistry of cinnamate-based sunscreens published in 2019.0. Quality Control of Methyl 3-phenyl-2-propenoate, Reprint Addresses Ebata, T (corresponding author), Hiroshima Univ, Grad Sch Sci, Dept Chem, Higashihiroshima 7398526, Japan.; Ehara, M (corresponding author), SOKENDAI, Grad Univ Adv Studies, Okazaki, Aichi 4448585, Japan.; Ehara, M (corresponding author), Inst Mol Sci & Res Ctr Computat Sci, 38 Myodayi, Okazaki, Aichi 4448585, Japan.; Yamazaki, K (corresponding author), Tohoku Univ, Inst Mat Res, Aoba Ku, Katahira 2-1-1, Sendai, Miyagi 9808577, Japan.. The CAS is 103-26-4. Through research, I have a further understanding and discovery of Methyl 3-phenyl-2-propenoate
The electronic states and photochemistry including nonradiative decay (NRD) and trans(E) -> cis(Z) isomerization of methylcinnamate (MC) and its hydrogen-bonded complex with methanol have been investigated under jet-cooled conditions. S-1((1)n pi*) and S-2((1)pi pi*) are directly observed in MC. This is the first direct observation of S-1(1n pi*) in cinnamate derivatives. Surprisingly, the order of the energies between the n pi* and pi pi* states is opposite to substituted cinnamates. TD-DFT and SAC-CI calculations support the observed result and show that the substitution to the benzene ring largely lowers the (1)pi pi* energy while the effect on (1)n pi* is rather small. The S-2(pi pi*) state lifetime of MC is determined to be equal to or shorter than 10 ps, and the production of the transient T-1 state is observed. The T-1(pi pi*) state is calculated to have a structure in which propenyl C=C is twisted by 90 degrees, suggesting the trans -> cis isomerization proceeds via T-1. The production of the cis isomer is confirmed by low-temperature matrix-isolated FTIR spectroscopy. The effect of H-bonding is examined for the MC-methanol complex. The S-2 lifetime of MC-methanol is determined to be 180 ps, indicating that the H-bonding to the C=O group largely prohibits the (1)pi pi* -> (1)n pi* internal conversion. This lifetime elongation in the methanol complex also describes well a higher fluorescence quantum yield of MC in methanol solution than in cyclohexane, while such a solvent dependence is not observed in para-substituted MC. Determination of the photochemical reaction pathways of MC and MC-methanol will help us to design photofunctional cinnamate derivatives.
Quality Control of Methyl 3-phenyl-2-propenoate. Welcome to talk about 103-26-4, If you have any questions, you can contact Kinoshita, S; Inokuchi, Y; Onitsuka, Y; Kohguchi, H; Akai, N; Shiraogawa, T; Ehara, M; Yamazaki, K; Harabuchi, Y; Maeda, S; Ebata, T or send Email.
Reference:
Article; Weng, Shiue-Shien; Ke, Chih-Shueh; Chen, Fong-Kuang; Lyu, You-Fu; Lin, Guan-Ying; Tetrahedron; vol. 67; 9; (2011); p. 1640 – 1648;,
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