|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|4765710||1362360||2018||7 صفحه PDF||ندارد||دانلود رایگان|
â¢Photoswitchable [n]rotaxanes based on dithienylethene unit were synthesized.â¢The photochromic properties and fluorescence behaviors were also investigated.â¢Non-covalent components could influence the photoswitching properties.â¢Photochromic signal (such as molar absorption coefficient) t can be integrated.
Mechanically interlocked structures such as rotaxanes and catenanes provide a novel backbone for constructing functional materials with unique structural characteristics. In this study, the novel photoswitchable [n]rotaxanes 11 and 12 based on dithienylethene unit were efficiently synthesized by the classical template-directed clipping approach. And their structures were well-confirmed by NMR, MS and elemental analysis. Investigation on photochromic properties indicated that dithienylethene-based [n]rotaxanes had good reversibility and excellent fatigue resistance upon irradiation with UV or visible light. And they displayed also excellent fluorescence switchable behavior. Interestingly, It was found that rotaxane 11 had better photoisomerization properties in comparison to its corresponding macrocycle 4, which indicated that the non-covalent components on the rotaxane 11 could influence the photoswitching properties. Furthermore, the mechanically interlocked molecules containing two dithienylethene backbones displayed around a 2-fold increase in the molar absorption coefficient compared with that of the mono dithienylethene derivative, which was consistent with the reported [n]rotaxane 9 and 10.
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Journal: Dyes and Pigments - Volume 148, January 2018, Pages 130-136