Solid-state Reaction in Organic Inclusion Crystal Investigated by Powder X-ray Diffraction Analysis

热敏纸的颜色在紫外线照射下由于彩色颜料的分解而变黄。为了解决这一问题，合成了一系列具有紫外光吸收功能的肉桂酸酯作为新型显色剂。耐光性的差异归因于结晶状态下分子构型的差异，其导致结晶状态下分子在紫外光下发生二聚反应，产生低紫外吸收化合物。

The color of thermal paper turns yellow by UV light irradiation due to decomposition of color pigment. In order to resolve this low light fastness problem, a series of cinnamic acid esters that have UV light absorbing function were synthesized as new group of color developing compound. The difference of the light fastness is attributed to the molecular configuration difference in the crystalline state, which leads crystalline state molecular dimerization reaction by UV light and produces low UV absorbing compound.