Exceptional dual fluorescent, excited-state intramolecular proton-transfer (ESIPT) columnar liquid crystals characterized by J-stacking and large Stokes shifts
作者:Madhu Babu Kanakala、Channabasaveshwar V. Yelamaggad
DOI:10.1016/j.molliq.2021.115879
日期:2021.6
microscopic, calorimetric and powder X-ray diffraction (XRD) studies evidence the occurrence of hexagonal columnar (Colh) phase having p6mm symmetry where the constituent slices result from the self-assembly of a pair of mesogens in a side-by-side manner facilitated by intense longitudinal π-π interactions. X-ray data confirm the absence of both directionally correlated tilting of the slices and transverse
激发态分子内质子转移(ESIPT)荧光团正在成为电子和生物技术应用中有希望的未来材料。ESIPT柱状(Col)液晶(LC)已被特别预测为先进技术的合适材料。但是,几乎没有朝这个方向进行任何探索,因此需要立即予以注意。在这里,我们报告的合成,表征和ESIPT活性的同源系列的新型Phasmidic双(N- salicylideneaniline)Col LCs的合成。光学显微镜,量热法和粉末X射线衍射(XRD)研究表明,出现了p 6 mm的六方柱状(Col h)相对称性是指,由强烈的纵向π-π相互作用促进并列排列的一对液晶元的自组装产生了组成层。X射线数据证实了切片之间没有方向相关的倾斜和柱内的横向核-核相互作用。荧光探测清楚地证明了ESIPT不仅在介晶的DCM溶液中发生,而且还在其固态,液晶和各向同性液相的三个缩合状态下发生。通常,在ESIPT现象中观察到两个原型发射带,分别在〜430 nm(弱)和〜630