Han, Yanning; Zhang, Tong; Chen, Qiao; Chen, Xinyu; Xue, Pengchong published an article in 2021. The article was titled 《π-Stacking Conversion and Enhanced Force-Stimuli Response of a Divinylanthracene Derivative in a Hydrogen-Bonded Framework》, and you may find the article in Crystal Growth & Design.Related Products of 523-27-3 The information in the text is summarized as follows:
Hydrogen bond-induced π-stacking conversion was used to achieve an enhanced force-stimuli response of 9,10-bis(2-(pyridin-4-yl)vinyl)anthracene (BP4VA). In BP4VA crystals, the mols. adopted a J-aggregate pattern, and no overlap between the central anthracene planes was observed Trimesic acid (TA) as a hydrogen bond donor could promote the transformation of the π-stacking type of BP4VA as a hydrogen bond acceptor. It was found that TA and BP4VA mols. formed two-dimensional lamellar hydrogen-bonded frameworks with large windows, which were filled by BP4VA mols. belonging to other layers. Within such three-dimensional packing, J-aggregate stacking type of BP4VA converted into a mixture of J-type and H-type dimers. Moreover, BP4VA adopted a highly twisted conformation, and π-π interaction between them was very weak. So, the hydrogen-bonded complex emitted a short wavelength fluorescence. More importantly, the yellow hydrogen-bonded complex turned into red solids under force stimuli, and its fluorescence had a fairly large shift of more than 110 nm. This is in contrast with a spectral shift of 43 nm from the sheared neat BP4VA crystals. Quantum chem. calculation and spectral observations implied that the planarization, shortened π-distance, and large overlap between anthracene units should be responsible for the large spectral shift. The results imply that the appropriate acid as a hydrogen bond donor might help distyrylanthracene derivatives possess outstanding functions. Hydrogen bond-induced π-stacking conversion was used to achieve an enhanced force-stimuli response of 9,10-bis(2-(pyridin-4-yl)vinyl)anthracene. Trimesic acid (TA) and BP4VA formed three-dimensional frameworks, in which the J-aggregate stacking type converted into a mixture of J-type and H-type dimers. Moreover, the yellow complex turned into red solids under force stimuli, and its fluorescence had a shift of more than 110 nm. In the experiment, the researchers used 9,10-Dibromoanthracene(cas: 523-27-3Related Products of 523-27-3)
9,10-Dibromoanthracene(cas: 523-27-3) is synthesized by the bromination of anthracene. The bromination reaction is carried out at room temperature using carbon tetrachloride as a solvent. Using 80-85% anthracene as raw material, adding bromine to react for half an hour, the yield is 83-88%.Related Products of 523-27-3
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary