Direct Spectroscopic Evidence of Photoisomerization in para-Methoxy Methylcinnamate Revealed by Low-Temperature Matrix-Isolation FTIR Spectroscopy

作者：Miyazaki Yasunori; Inokuchi Yoshiya; Akai Nobuyuki^*; Ebata Takayuki

来源：Journal of Physical Chemistry Letters, 2015, 6(7): 1134-1139.

DOI：10.1021/acs.jpclett.5b00203

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.

• 出版日期2015-4-2