Direct Spectroscopic Evidence of Photoisomerization in para-Methoxy Methylcinnamate Revealed by Low-Temperature Matrix-Isolation FTIR Spectroscopy.
Direct Spectroscopic Evidence of Photoisomerization in para-Methoxy Methylcinnamate Revealed by Low-Temperature Matrix-Isolation FTIR Spectroscopy.
复制标题
DOI：
10.1021/acs.jpclett.5b00203
复制
发表时间：
2015-04
期刊：
影响因子：
--
通讯作者：
Y. Miyazaki;Y. Inokuchi;Nobuyuki Akai;T. Ebata
中科院分区：
文献类型：
--
作者：
Y. Miyazaki;Y. Inokuchi;Nobuyuki Akai;T. Ebata
通过低温基质隔离 FTIR 光谱研究了对甲氧基甲基肉桂酸酯 (p-MMC) 的光致异构化。特别是，中红外频率区域（1100-1800 cm(-1)）的差异光谱使我们能够区分≥300 nm紫外（UV）光照射前后的结构变化，并通过与计算的红外光谱进行比较，确信顺式异构体是由反式异构体产生的。此外，在不同波长的紫外光连续照射下，证明了 p-MMC 的可逆异构化。这些发现为 p-MMC 的电子激发态动力学提供了新的见解。
The photoisomerization of para-methoxy methylcinnamate (p-MMC) has been studied by low-temperature matrix-isolation FTIR spectroscopy. In particular, the difference spectrum of the mid-IR frequency region (1100-1800 cm(-1)) allows us to distinguish the structural change before and after ultraviolet (UV) light irradiation at ≥300 nm and to convince that the cis-isomer is produced from the trans-isomer by comparing with the calculated IR spectra. Additionally, a reversible isomerization of p-MMC is demonstrated upon a sequential irradiation with different wavelengths of UV light. These findings provide a new insight into the electronic excited-state dynamics of p-MMC.