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将腺嘌呤基团共价对称修饰到多金属氧簇两侧,通过阳离子替换得到带有长烷基链抗衡离子的新型凝胶构筑基元.利用嘌呤基团间氢键和抗衡离子中烷基链侧向范德华力的协同作用得到网络状纤维结构,实现稳定溶剂的作用,获得超分子凝胶.调控环境温度可以实现溶胶-凝胶的可逆转变.我们利用扫描电子显微镜、透射电子显微镜、X射线衍射等手段对凝胶的形貌和结构进行了表征,结合组装基元分子骨架结构分析和用变温核磁表征,提出了凝胶形成和溶胶-凝胶转变的机理.
The adenine group is covalently symmetrically modified to both sides of the polyoxometalate, and a new gel building unit with long alkyl chain counterion is obtained by cation replacement.Using the intermolecular hydrogen bonds between the purine groups and the alkyl The synergistic effect of van der Waals forces on the chain side to obtain a network-like fiber structure, the role of stabilizing the solvent to obtain supramolecular gel.Controlling the ambient temperature can be reversible transformation of sol-gel.We use scanning electron microscopy, transmission electron microscopy, X Ray diffraction and other means to characterize the morphology and structure of the gel. Based on the analysis of the molecular structure of the assembled element and the use of the NMR thermogravimetry, the mechanism of gel formation and sol-gel transition was proposed.