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采用离子交换和共沉淀两种不同方法将二氟尼柳插入镁铝水滑石层间,得到一种新型的有机-无机层状复合材料。通过X射线粉末衍射、红外光谱、元素分析和热重-差热等手段对材料进行了表征。结果表明,离子交换法和共沉淀法成功地将二氟尼柳插入水滑石,得到的材料层状结构完整、晶相单一,且层间距均大于二氟尼柳分子尺寸,扩大为1.81￣2.14nm;二氟尼柳插入后,复合水滑石材料的热稳定性大幅度提高。客体二氟尼柳与主体层板之间存在超分子作用力,二氟尼柳分子的羧基与水滑石层板之间相互作用,以双层倾斜交替地排列于层板之间。此外,根据其超分子作用力建立了二氟尼柳插层镁铝水滑石的超分子结构模型。
Two different methods of ion exchange and coprecipitation were used to insert diflunisal into the Mg-Al hydrotalcite interlayer to obtain a new type of organic-inorganic layered composite. The materials were characterized by X-ray powder diffraction, infrared spectroscopy, elemental analysis and TG-DTA. The results show that the ion exchange method and coprecipitation method successfully inserted diflunisal into hydrotalcite. The obtained material has a complete layered structure, a single crystal phase and a larger interlayer spacing than that of diflunisal, expanding to 1.81-2.14 nm; after the insertion of diflunisal, the thermal stability of the composite hydrotalcite material is greatly improved. There is supramolecular interaction between the diflunisal and the host lamella, and the interaction between the carboxyl groups of the diflunisal molecule and the hydrotalcite lamellae is alternately arranged in two layers with a slant between the lamellae. In addition, the supramolecular structure model of diflunisal intercalated Mg-Al hydrotalcite was established based on its supramolecular forces.