对称八甲基取代六元瓜环与烷基二氨离子的主客体相互作用  

Host-guest Complexation of Octamethyl-substituted Cucurbit[6]uril with a Series of Alkyldiammonium Ions

作　　者：方国生[1] 孟迪[1] 林瑞莲[1] 孙文起[1] 刘静欣[1] FANG Guosheng MENG Di LIN Ruilian SUN Wenqi LIU Jingxin(School of Chemistry and Chemical Engineering, Anhui University ofTechnology, Ma＇anshan 243032, Chin)

机构地区：[1]安徽工业大学化学与化工学院,安徽马鞍山243032

出　　处：《安徽工业大学学报（自然科学版）》2017年第1期38-43,共6页Journal of Anhui University of Technology（Natural Science）

基　　金：国家自然科学基金项目(20971002;21371004)

摘　　要：研究了对称八甲基取代六元瓜环(OMeQ[6])/烷基二铵离子(^+H_3N(CH_2)n NH_3^+,n=2~8)在溶液中的主客体相互作用。~1H NMR谱图表明,除乙二胺离子外,其余客体分子均与OMeQ[6]形成了包结物;如果烷基二胺离子的烷基链长度超过5个亚甲基的长度,则烷基链的构象在OMeQ[6]空腔中被压缩。等温量热滴定(ITC)结果表明,OMeQ[6]与烷基二胺离子的主客体相互作用的驱动力主要是焓驱动。The host- guest complexation of octamethyl- substituted cucurbit[ 6]uril （OMeQ[ 6]） with a series of alkyldiammonium ions （＋H3N（CH2）n NH3＋, n=2-8） in solution was studied. NMR spectra indicate that all alkyl- diammonium ions form inclusion complexes with the OMeQ[ 6], except for the ethanediammonium ion. If the length of the alkyl chain of the alkyldiammonium ion is longer than that of five methylene groups, the alkyl chain is compressed conformation in the cavities of OMeQ[ 6]. Isothermal titration calorimetry （ ITC） results point out that the host-guest complexation of OMeQ[ 6] with the alkyldiammonium ions is mainly driven by enthalpy.

关 键 词：瓜环 烷基二铵离子 主客体配位作用 核磁共振氢谱 等温量热滴定 

分 类 号：O624.6[理学—有机化学]