Syntheses and properties of a series of novel surface active salts based on 1,4-dialkyl-1,4-diazoniabicyclo[2.2.2]octane and their supermolecular interactions with cucurbit[6]uril

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• 作者：Fei Xu ; ^{xufei2058@163.com} ; Hongyu Chen ; Haibo Zhang ; Gongzhen Cheng ; Xiaohai Zhou ; ^{zxh7954@hotmail.com}
• 关键词：Surface active salt ; NMR ; Aggregation number ; Supermolecular
• 刊名：Journal of Molecular Structure
• 出版年：2012
• 期刊代码：62_00222860
• 类别：ch
• 出版时间：13 June, 2012
• 卷：1017
• 期：Complete
• 页码：14-18
• 文件大小：502 K

摘要

A series of novel surface active salts, 1,4-dialkyl-1,4-diazoniabicyclo[2.2.2]octane bromides (2C_xDABCOBr₂), have been synthesized and characterized. Their melting points show a U-shaped curve with increasing alkyl chain length, while the decomposition temperatures do not show significant differences. Critical aggregation concentration (cac) of 2C₆DABCOBr₂ determined by the concentration dependence of ¹H NMR chemical shifts is about 100 mmol L^鈭?, which is in good agreement with the cac obtained by electrical conductivity and surface tension measurement. The aggregation number of 2C₆DABCOBr₂ in aqueous solutions studied with a detailed analysis of ¹H NMR is 36. The interaction between 2C₆DABCOBr₂ and cucurbit[6]uril in aqueous solution has also been investigated by ¹H NMR and spin-lattice relaxation time measurement (T₁), indicating the formation of a complex with one alkyl chain of 2C₆DABCOBr₂ inserted into the cavity of CB[6].