Photochemical Reaction of <i>p</i>-hydroxycinnamic-thiophenyl Ester in the Microcrystalline State
作者:Anwar Usman、Tsuyoshi Asahi、Teruki Sugiyama、Hiroshi Masuhara、Norimitsu Tohnai、Mikiji Miyata
DOI:10.1021/jp909850r
日期:2010.11.18
We have studied the photochromic reaction of p-hydroxycinnamic-thiophenyl ester in the microcrystalline state We attributed the fluorescence spectral evolution of the microcrystal under UV irradiation to the photoinduced trans-to-cis isomerization The photocyclic behavior of the chromophore was demonstrated by cis-to-trans back reaction under a subsequent visible light irradiation In addition the [2 2] topochemical photocyclodimer was observed as another photoproduct It is considered that the cooperative photoisomerization is initiated at the local lattice distortion and free spaces around the [2 + 2] cyclodimer near the crystal sui lace and the photoisomerization induces larger lattice deformation and further photoisomerization in the interior of the crystal