作者:Jozef A. Z. Hodyl、Stephen F. Lincoln、Kevin P. Wainwright
DOI:10.1007/s10847-010-9782-8
日期:2010.12
A series of cyclen (1,4,7,10-tetraazacyclododecane) derived molecular receptors for aromatic oxoanions, that are activated by complexation with Cd(II), have been covalently linked to 3-(glycidoxy)propyl-functionalised silica gel (70–230 mesh). These immobilised receptor complexes are highly effective for the sequestration of o-hydroxybenzoates and 2-naphthoate from aqueous solution, achieving a >80% saturation level by stirring the material in the aqueous solution for 1 h at pH 7.00 and 298 K. Examination of the uptake levels of a variety of different benzoates and naphthoates suggests that the retention mechanism involves a combination of classical hydrogen bonding and non-classical, water mediated, O–H···π hydrogen bonding. Contrary to expectations, attachment of hydroxy terminated polyether chains to the periphery of the receptor complex diminished the level of uptake. Silica-attached receptor complexes of the type shown are effective materials for sequestering o-hydroxybenzoates from aqueous solution.
一系列由环烯(1,4,7,10-四氮杂环十二烷)衍生的芳香族氧阴离子分子受体通过与镉(II)络合而被激活,并与 3-(缩水甘油)丙基功能化硅胶(70-230 目)共价连接。在 pH 值为 7.00 和 298 K 的条件下,将这种材料在水溶液中搅拌 1 h 就能达到 80% 的饱和度。对各种不同苯甲酸盐和萘酸盐吸收水平的研究表明,保留机制涉及经典氢键和以水为介质的非经典 O-H--π 氢键的组合。与预期相反,羟基末端聚醚链附着在受体复合物外围会降低吸收水平。所示类型的二氧化硅附着受体复合物是从水溶液中封存邻羟基苯甲酸盐的有效材料。