Photochemical Reaction of p-hydroxycinnamic-thiophenyl Ester in the Microcrystalline State

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• 作者：Anwar Usman ; Tsuyoshi Asahi ; Teruki Sugiyama ; Hiroshi Masuhara ; Norimitsu Tohnai ; Mikiji Miyata
• 刊名：Journal of Physical Chemistry B
• 出版年：2010
• 出版时间：November 18, 2010
• 年：2010
• 卷：114
• 期：45
• 页码：14233-14240
• 全文大小：350K
• 年卷期：v.114,no.45(November 18, 2010)
• ISSN：1520-5207

文摘

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 surface, and the photoisomerization induces larger lattice deformation and further photoisomerization in the interior of the crystal.