Direct Spectroscopic Evidence of Photoisomerization in para-Methoxy Methylcinnamate Revealed by Low-Temperature Matrix-Isolation FTIR Spectroscopy.
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.
†Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan.
Yasunori
Y
Miyazaki
†Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan.
Yoshiya
Y
Inokuchi
‡Graduate School of Bio-Applications and Systems Engineering (BASE), Tokyo University of Agriculture and Technology, Naka-cho, Koganei, Tokyo 184-8588, Japan.
Nobuyuki
N
Akai
†Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan.
Takayuki
T
Ebata
D002934:Cinnamates / Q000737:chemistry*; D003080:Cold Temperature; D003373:Coumaric Acids / Q000737:chemistry*; D007536:Isomerism; D010777:Photochemistry; D017550:Spectroscopy, Fourier Transform Infrared; D014466:Ultraviolet Rays
D002934:Cinnamates; D003373:Coumaric Acids
Photoactive Yellow Protein; low temperature; matrix-isolation spectroscopy; methylcinnamate; photoisomerization