Interconversion of host–guest components in supramolecular assemblies of polycarboxylic acids and reduced Schiff bases
作者:Udai P. Singh、Kapil Tomar、Sujata Kashyap
DOI:10.1007/s11224-015-0699-0
日期:2016.8
Eight supramolecular assemblies of benzene-1,3,5-tricarboxylic acid (H3BTC) and benzene-1,2,4,5-tetracarboxylic acid (H4BTtC) with reduced Schiff base of flexible backbone having phenolic and pyridyl groups, i.e., 1,2-bis(2-hydroxybenzylamino)ethane, 1,3-bis(2-hydroxybenzylamino)propane, 1,4-bis(2-hydroxybenzylamino)butane and 1,4-bis(4-pyridinylmethylamino)butane have been constructed by proton transfer reaction. H3BTC forms host–guest type assemblies with amines having phenolic functionality, while a layered structure was obtained with pyridyl functionalized amine. H4BTtC also formed host–guest assemblies with the diamines where reduced Schiff base acts as host and acid moiety acts as the guest. Different conformations of the diamines were observed in these assemblies. Theoretical studies were performed to analyze the effect of varied chain lengths of diamines on hydrogen bond interaction energy of the adducts.
苯-1,3,5-三羧酸(H3BTC)和苯-1,2,4,5-四羧酸(H4BTtC)与具有酚基和吡啶基的柔性骨架的还原型希夫碱的八种超分子组装体,即通过质子转移反应构建了 1,2-双(2-羟基苄基氨基)乙烷、1,3-双(2-羟基苄基氨基)丙烷、1,4-双(2-羟基苄基氨基)丁烷和 1,4-双(4-吡啶基甲基氨基)丁烷。H3BTC 与具有酚官能团的胺形成了主-客型组装体,而与吡啶官能团胺则形成了层状结构。H4BTtC 还与二胺形成了主-客型化合物,其中还原型希夫碱作为主,酸作为客。在这些组合物中观察到二胺的不同构象。理论研究分析了不同链长的二元胺对加合物氢键相互作用能的影响。