Alkyl Chain Length- and Polymorph-Dependent photomechanochromic fluorescence of anthracene photodimerization in molecular crystals: roles of the lattice stiffness.
CHEMISTRY-A EUROPEAN JOURNAL(2020)
摘要
Anthracene-pentiptycene hybrid systems1-Cn, wherenrefers to the number of carbon atoms in the linear alkyl chain, crystallize in three different polymorphs, denoted Y (yellow), G (green), and B (blue) forms in terms of the fluorescence color. While all Y-form crystals show the same yellow-to-blue fluorescence color response to the photomechanical stress generated by the anthracene [4+4] photodimerization reaction, the four G forms exhibit distinct photomechanofluorochromism (PMFC): from green to blue forG-1-C4, to orange forG-1-C7, to red forG-1-C8, and to red then blue forG-1-C9, and the B forms show no photochromic activity. The intriguing RGB three-color PMFC and abnormal topochemical reactivity ofG-1-C9are attributed to inherent softness of the crystal lattice.
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关键词
crystal engineering,fluorescence,photochemistry,pi interactions,polymorphism
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