超分子结构甲基橙插层水滑石的组装及其光热稳定性研究

甲基橙是一种酸性染料,但因为它的光和热稳定性较差,使其应用范围和使用效果受到了一定限制.以Mg_0.67Al_0.33(OH)₂(CO₃)_0.165·0.58H₂OLDHs为前体,采用离子交换法,将甲基橙插入到LDHs层间,借助XRD,FTIR,UV-Vis和TG-DTA等手段对样品进行表征.结果表明,甲基橙阴离子可以完全取代前体层间的CO₃^2-离子,组装得到晶体结构良好的甲基橙插层LDHs.对其结构进行研究发现,LDHs主体层板与客体甲基橙阴离子之间存在静电吸引、氢键和其它弱化学键相互作用,具有超分子结构特征.该超分子结构材料不仅保持了甲基橙本身的颜色,而且与甲基橙相比,其耐光性和耐热性均有大幅度的提高.

Supramolecular Assembly of Methyl Orangepillared Hydrotalcite and Its Light and Thermal Stability

Methyl orange is one of acid dyes, but its range of use is greatly limited because of its low light and thermal stability. Methyl orange anion-pillared hydrotalcites were successfully assembled by an ion exchange method using Mg0.67Al0.33(OH)2(CO3)0.165·0.58H2O as a precursor. The sample thereby obtained was characterized by XRD, FTIR and UV-Vis spectroscopies and TG-DTA. The results show that the original interlayer carbonate anions of the hydrotalcite precursor can be completely replaced by methyl orange anions. The structure of the methyl orange anion-pillared hydrotalcite was investigated. It was found that the interaction of the host layers and the guests is through electrostatic attraction, hydrogen bonding and other weak chemical bonding interactions, confirming that the intercalated hydrotalcite has a supramolecular structure. The light and thermal stability of methyl orange anion-pillared hydrotalcite was enhanced to a considerable extent, comparing with that of methyl orange.