水滑石类有机无机杂化材料的合成与嫁接作用

以硝酸根型水滑石为前驱体，采用阴离子直接交换法制备了水杨酸根柱撑水滑石有机-无机杂化材料，在对样品进行结构表征的基础上，用DTA、IR和XRD等手段研究了主体层板和客体阴离子柱之间的相互作用.结果表明，有机阴离子插入水滑石层间，由于主客体相互作用，可使水滑石层的脱羟基温度和有机阴离子的燃烧分解温度得到较大幅度的提高.不同温度处理样品的XRD和IR研究表明，样品的热处理过程实质上是一个促进主客体相互作用的过程，即客体阴离子向主体层板的嫁接过程，其直接结果是形成氢键.通常，对嫁接温度的选择应是在样品的脱除层间水和羟基完全脱去的温度之间.

Studies on the Synthesis and Grafting of the Salicylate Pillared Hydrotalcite Organic/Inorganic Hybrid

In this paper, salicylate - pillared MgAl hydrotalcite organic/inorganic hybrid was synthesized by using direct anion exchange method in the aqueous solution with NO3 - MgAl as precursor, and was characterized by XRD, IR and DTA. The guest - host interaction in the synthesized sample was investigated. Results show that the thermal stabilities of the brucite- like layers and the inserted anion pillars in the salicylate pillared hydrotalcite are largely improved due to the guest- host interaction. DTA combined with the XRD and IR studies of the sample calcined at different temperatures reveal that the grafting of the guest anions to the host brucite - like layers takes place during the thermal processing accompanying the Hydrogen - bonding formation, and the proper grafting temperatures are between the elimination of water molecules from the interlayer space and the elimination of the hydroxyl groups from the brucite - like layers.