作者:Ana Pérez、José Luis Serrano、Teresa Sierra、Alfredo Ballesteros、Diana de Saá、Roberto Termine、Upendra Kumar Pandey、Attilio Golemme
DOI:10.1039/c2nj20950k
日期:——
Two series of polycatenar molecules consisting of a π-conjugated rigid core derived from 3-hexen-1,5-diyne coupled to different types of benzoic acid derivatives have been prepared and their potential as multifunctional materials has been investigated. The size ratio between the rigid core and the benzoate-derived groups, which vary in bulk, is crucial to address self-organization, thus indicating the delicate balance of forces involved in liquid crystalline (LC) behaviour. LC nematic, crystalline or LC columnar behaviour is observed depending on the structure of the benzoate moiety. Hexagonal two-dimensional columnar organization is attained for mesogens with benzoate-derived groups bearing six and nine alkoxylic tails. The stacking unit of the columnar organizations is different depending on the total number of tails, twelve or eighteen, with two molecules and half a molecule per columnar stratum, respectively. Macroscopic properties related to molecular structure, such as luminescence, chirality and electroactivity, have also been studied. Luminescent behaviour is observed for all mesogenic materials, which show higher Stokes shifts than in solution. In addition, supramolecular chirality in the mesophase has been observed for a chiral mesogen. Finally, the photoconducting behaviour of two of the columnar materials has been evaluated.
我们制备了两个系列的聚卡替那尔分子,它们由源自 3-己烯-1,5-二炔的 π-共轭刚性核心和不同类型的苯甲酸衍生物组成,并研究了它们作为多功能材料的潜力。刚性内核与苯甲酸衍生物基团之间的尺寸比(在体积上有所不同)对于解决自组织问题至关重要,从而表明了液晶(LC)行为中所涉及的力的微妙平衡。根据苯甲酸酯分子结构的不同,可观察到液晶向列、结晶或液晶柱状行为。带有六个和九个烷氧基尾部的苯甲酸酯衍生基团的中间体可形成六角形的二维柱状组织。柱状组织的堆积单位因尾部总数(12 或 18)而异,每个柱状层分别有两个分子和半个分子。我们还研究了与分子结构有关的宏观特性,如发光、手性和电活性。所有介生材料都能发光,并显示出比溶液中更高的斯托克斯位移。此外,还观察到一种手性介原在介相中具有超分子手性。最后,还对两种柱状材料的光电导行为进行了评估。