作者:Rola Mouawia、Ahmad Mehdi、Catherine Reyé、Robert J. P. Corriu
DOI:10.1039/b719162f
日期:——
We describe here a new method permitting the one-step synthesis of ordered (lamellar phase) organosilicas highly functionalised with carboxylic acid or phosphonic acid groups. These materials were obtained by hydrolysis and polycondensation of monosilylated precursors cyanoalkyltrialkoxysilane (NC-(CH2)nSi(OR)3) and diethylphosphonatoalkyltriethoxysilane ((EtO)2(O)P-(CH2)nSi(OEt)3) in acidic media without any structure-directing agent. The hydrolysis of -CN and -P(O)(OEt)2 groups into -COOH and -P(O)(OH)2 involves the in situ formation of dimers by strong hydrogen bonds, which is the crucial step to obtain a solid. The involvement of hydrophobic interactions between alkylene chains was also evidenced. All materials were characterised by X-ray diffraction measurements, elemental analyses and solid-state 13C and 29Si NMR spectroscopies. The accessibility and adsorption capacity of these groups towards lanthanide ions were investigated.
本文描述了一种新方法,能够一步合成具有高有序层状结构的有机硅材料,这些材料富含羧酸或膦酸基团。这些材料是通过在酸性介质中无结构导向剂的情况下,对单硅烷化前驱体——氰基烷基三烷氧基硅烷(NC-(CH2)nSi(OR)3)和二乙基膦酸烷基三乙氧基硅烷((EtO)2(O)P-(CH2)nSi(OEt)3)进行水解和缩合反应而获得的。-CN和-P(O)(OEt)2基团的水解生成-COOH和-P(O)(OH)2涉及通过强氢键原位形成二聚体,这是获得固体的关键步骤。此外,烷基链之间的疏水相互作用也得到了证实。所有材料均通过X射线衍射测量、元素分析和固体状态13C与29Si核磁共振光谱进行了表征。针对镧系离子,这些基团的可用性和吸附能力得到了研究。