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以基于单糖为内核,楔形液晶基元DOBOB酸(3,4,5-三[对-(十二烷氧基)苄氧基]苯甲酸)为分枝的树状碳水化合物液晶为研究对象,利用DSC、热台偏光显微镜、XRD和CD/UV光谱等手段研究该类化合物的液晶性.研究发现分枝的数目对该类化合物的液晶性有显著影响,以2-乙酰氨基葡萄糖为内核的包含四个分枝的树状分子具有最高的液晶结构有序性,清亮点也显著高于另两种单糖内核(含五个分枝)的树状分子.此外,该类碳水化合物液晶形成的液晶相都具备超分子手性,为探索碳水化合物手性液晶相提供了一条新的思路.
A dendritic carbohydrate liquid crystal based on the monosaccharide as the core, DOBOB (3,4,5-tris (p- (dodecyloxy) benzyloxy) benzoic acid The liquid crystallinity of these compounds was studied by means of DSC, hot stage polarization microscope, XRD and CD / UV spectroscopy.The results showed that the number of branches had a significant effect on the liquid crystallinity of these compounds, with 2-acetylglucosamine as the core Of the four branched dendrimers have the highest order of the liquid crystal structure and the clearing point is also significantly higher than the other two kinds of monosaccharide core (including five branches) of the dendrimer.In addition, this kind of carbohydrate liquid crystal The formed liquid crystal phase possess supramolecular chirality, which provides a new idea for exploring the chiral liquid crystal phase of carbohydrates.