Photochemical reaction of p-hydroxycinnamic-thiophenyl ester in the microcrystalline state.
Photochemical reaction of p-hydroxycinnamic-thiophenyl ester in the microcrystalline state.
复制标题
DOI：
10.1021/jp909850r
复制
发表时间：
2010-11
期刊：
影响因子：
--
通讯作者：
A. Usman;T. Asahi;T. Sugiyama;H. Masuhara;N. Tohnai;M. Miyata
中科院分区：
文献类型：
--
作者：
A. Usman;T. Asahi;T. Sugiyama;H. Masuhara;N. Tohnai;M. Miyata
本文研究了对羟基肉桂酸苯硫酯在微晶状态下的光致变色反应。我们归因于荧光光谱的演变的微晶，在紫外光照射下，光诱导的trans-to-cis异构化。在随后的可见光照射下，通过顺式到反式的逆反应证明了发色团的光环化行为。此外，[2 + 2]拓扑化学光环二聚体被观察到作为另一种光产物。研究认为，协同光异构化是在[2 + 2]环二聚体周围的晶格畸变和自由空间中发生的，光异构化导致晶格畸变，并在晶体内部引起进一步的光异构化.
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.