Promkatkaew, Malinee published the artcilePhotophysical properties and photochemistry of substituted cinnamates and cinnamic acids for UVB blocking: effect of hydroxy, nitro and fluoro substitutions at ortho, meta and para positions, Application In Synthesis of 1772-76-5, the publication is Photochemical & Photobiological Sciences (2014), 13(3), 583-594, database is CAplus and MEDLINE.
Photophys. properties and photochem. of various substituted cinnamates and cinnamic acids for UV B blocking were investigated exptl. and theor. This series includes monohydroxy, -nitro and -fluoro derivatives The absorption spectra were satisfactorily reproduced by the direct SAC-CI method with respect to the peak position and intensity. The transition character of the low-lying two ¦Ð¦Ð* and ¦Ò¦Ð* states for these 18 derivatives was analyzed. The para derivatives have a different transition character of the ¦Ð¦Ð* transitions compared with those of the ortho and meta derivatives To elucidate the relaxation mechanism, the emission spectra were observed with oxygen quenching and the photostability was examined exptl. The calculated radiative lifetimes indicate that the ortho- and meta-substituted derivatives have longer lifetimes for emission than the para derivatives The potential energy curves of the first and second singlet excited states of the hydroxy derivatives as well as the vertical singlet and triplet transitions were examined to investigate the relaxation qual. The ortho and meta derivatives have an energy barrier or flat surface in S1 resulting in fluorescence, whereas the para derivatives show nonradiative decay without an energy barrier. The para-hydroxy derivative was found to be an excellent UV absorber based on its broad absorption in the UVB/UVA regions, less emission and higher photostability.
Photochemical & Photobiological Sciences published new progress about 1772-76-5. 1772-76-5 belongs to catalysis-chemistry, auxiliary class Benzenes, name is (E)-3-(3-Nitrophenyl)acrylic acid, and the molecular formula is C9H7NO4, Application In Synthesis of 1772-76-5.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia