The 1:1 and 1:2 macroscopic binding constants of didecyldimethylammonium bromide (DDAB) and α-, β-, and γ-cyclodextrins (CD) are determined from the electromotive force measurements with a DDAB-selective electrode, and the magnitude of these constants is interpreted in terms of the molecular structures of complexes. The 1:1 macroscopic binding constants of a double chain surfactant is 2-fold larger than that of a single chain, because the former has two chains. The 1:1 macroscopic binding constants of DDAB are in the increasing order α-CD < β-CD ≈ α-CD, consistent with those of a single chain surfactant. In the 1:1 complex of DDAB and γ-CD, one or two decyl chains are incorporated into the CD cavity. The 1:2 macroscopic binding constants of DDAB are in increasing order γ-CD ≪ β-CD α-CD. This order is interpreted in terms of the structure of complexes:  the first larger ligated CD inhibits the second ligation more strongly. The present result serves for the quantitative understanding of the interaction bet...

中文翻译：

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从电动势测量推导出二癸基二甲基溴化铵和环糊精的多重络合

二癸基二甲基溴化铵 (DDAB) 和 α-、β- 和 γ-环糊精 (CD) 的 1:1 和 1:2 宏观结合常数由 DDAB 选择性电极的电动势测量值确定，这些值的大小常数是根据配合物的分子结构来解释的。双链表面活性剂的 1:1 宏观结合常数是单链表面活性剂的 2 倍，因为前者有两条链。DDAB的1:1宏观结合常数呈递增顺序α-CD<β-CD≈α-CD，与单链表面活性剂一致。在 DDAB 和 γ-CD 的 1:1 复合物中，一个或两个癸基链并入 CD 空腔。DDAB 的 1:2 宏观结合常数按递增顺序 γ-CD ≪ β-CD α-CD。这个顺序是根据复合物的结构来解释的：第一个较大的连接 CD 更强烈地抑制了第二个连接。目前的结果用于对交互赌注的定量理解......