Piezochromic luminescence and aggregation induced emission of 9,10-bis[2-(2-alkoxynaphthalen-1-yl)vi

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Four derivatives of 9,10-bis[2-(2-alkoxynaphthalen-1-yl)vinyl]anthracene(BNAs) were designed,successfully synthesized and characterized by spectrofluorometer, powder wide-angle X-ray diffraction(PXRD) and differential scanning calorimetry experiments(DSC), etc. It was found that these compounds exhibited aggregation-induced emission phenomenon. Moreover, these target compounds displayed reversible color change from yellow to orange upon pressing and annealing process. Interestingly, all of BNAs obviously presented red-shifted piezofluorochromic(PFC) properties and behaved mainly length dependence of alkoxy group, in which, BNA displayed the largest PFC spectral shift(DlPFC= 26 nm). The PXRD profiles demonstrated the transformation from crystalline to amorphous state upon grinding, and the mechanism of PFC behaviors was proposed. Thus, changing the length of alkoxyl chain could be an alternative way to tune their PFC behaviors. All derivatives of 9,10-bis [2- (2-alkoxynaphthalen-1-yl) vinyl] anthracene (BNAs) were designed, successfully synthesized and characterized by spectrofluorometer, powder wide- angle X-ray diffraction (PXRD) These target compounds displayed reversible color change from yellow to orange upon pressing and annealing process. Interestingly, all of BNAs obviously presented red-shifted emission. piezofluorochromic (PFC) properties and behaved mainly length dependence of alkoxy group, which, BNA displayed the largest PFC spectral shift (DlPFC = 26 nm). The PXRD profiles called the transformation from crystalline to amorphous state upon grinding, and the mechanism of PFC Thus, changing the length of alkoxyl chain could be an alternative way to tune their PFC behaviors.
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