Abstract
The synthesis and characterization of two novel photochromic diarylethenes containing boron difluoride chromophores is described. The boron difluoride chromophores are connected directly to the thiophene rings and participate in the photoisomerization reaction. X-ray single crystal structure analysis of the diarylethenes indicates that intermolecular planar π–π interactions are significantly alleviated, due to various intermolecular non-covalent bondings. Therefore, they show almost the same fluorescent properties in the solid state as in dilute chloroform solutions. These two diarylethenes show typical photochromic properties in chloroform and also in poly(methyl methacrylate) film. During the photochromism, fluorescence of the diarylethenes could be reversibly tuned.
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