Typical photochromic compounds, such as azobenzenes, spirobenzopyrans, and spirooxazines, require large geometrical structure or molecular volume changes in the photochromic reaction process. Therefore, the reactivity is lost in the rigid crystalline lattice.
典型的光致变色物质，比如偶氮苯肼，螺吡喃，螺噁嗪等，在变色过程中要求有比较大的分子结构和分子体积的改变，因此这类物质在刚性的固态晶格中就丧失了变色活性。
参考来源 - 吡唑啉酮缩氨基硫脲类化合物的合成，晶体结构及光化学性质研究·2,447,543篇论文数据，部分数据来源于NoteExpress
N the volume occupied by one mole of a substance 摩尔分子体积 (Also called molar volume)
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