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选取3种不同结构的苄醚型树枝状分子为分枝,以N-乙酰氨基葡萄糖为内核,合成出一类树枝化碳水化物;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,并命名为树状碳水化合物液晶.研究表明,连接有楔形树枝状单元的化合物形成手性柱状六方相或者向列相,连接有锥形树枝状单元的化合物未能如预期形成立方相,而仍然形成手性柱状六方相.超分子手性很可能源于树枝状单元与糖内核的协同自组装,使得树状分子沿着柱轴螺旋式堆砌;而糖环内核则对超分子柱的手性起调控作用,从而避免了外消旋的发生.该类化合物为研究碳水化合物诱导手性超分子聚集体提供了新的思路.
Three kinds of benzyl ether type dendrimers with different structures were selected as the branches and N-acetylglucosamine as the core to synthesize a kind of dendronized carbohydrate. DSC, hot stage polarization microscope, XRD and CD / UV spectroscopy The liquid crystallinity of these compounds was studied and named as dendritic carbohydrate liquid crystals.Research shows that compounds with tapered dendritic units form chiral hexagonal or nematic phase and compounds with tapered dendritic units failed As expected, a cubic phase is formed while still forming a hexagonal chiral hexagonal phase. Supramolecular chirality is likely due to the synergistic self-assembly of dendritic units with the sugar core such that the dendrimer is helically piled along the column axis while the sugar ring core Then the supramolecular column chirality play a regulatory role, thus avoiding the racemization of these compounds for the study of carbohydrate-induced chiral supramolecular aggregate provides a new way of thinking.