六、七、八元瓜环与苯胺系列衍生物的相互作用  

Interaction of Cucurbit[n=6,7,8] with Aniline and Its Derivates

作　　者：曾启华[1] 祝黔江[1] 薛赛凤[1] 牟兰[1] 陶朱[1] 

机构地区：[1]贵州大学理学院应用化学研究所

出　　处：《化学学报》2006年第20期2101-2110,共10页Acta Chimica Sinica

基　　金：科技部国际科技合作重点项目(No.2003DF000030);贵州省省长基金资助项目(No.05008);贵州省国际科技合作重点项目;贵州省教育厅自然科学研究资助项目.

摘　　要：利用紫外吸收光谱、荧光光谱以及1HNMR方法详细考察了六、七、八元瓜环(Q[6],Q[7],Q[8])与苯胺系列衍生物客体的相互作用和体系pH对其作用的影响.实验结果表明,3种瓜环与苯胺系列衍生物客体的相互作用强弱、作用比例以及作用模式与体系的酸度密切相关:在“高”或“低”pH条件下,未观察到瓜环与这些客体的明显作用;在介于“高”与“较高”或“低”与“较低”的pH范围,瓜环与这些客体发生相互作用,形成1∶1的包结配合物;而在介于“较高”与“较低”的pH范围,瓜环与这些客体发生相互作用,可形成1∶2的包结配合物.对于不同的瓜环-客体作用体系,相应的pH范围各不相同.本文利用简便的实验方法,测试了这些pH值及其范围.根据测定的结果,结合瓜环以及客体的结构特征,对体系主客体在不同的酸度区域表现出的不同作用模式进行了探讨.Interaction of cucurbit[n=6, 7, 8]urils（Q[6], Q[7], Q[8]） with aniline and its derivates and influence of pH on the interaction were studied by using UV spectroscopy, fluorescence spectrophotometry and ^1H NMR technique in details. The experimental results revealed that the interaction, such as interaction models and ratio of the interacted Q[n] with the guest, is closely related with pH of a host-guest system. Generally, there are five interaction stages： there is no obvious interaction between Q[n] and the title guest（s） at the ＂highest＂ and the ＂lowest＂ pH; the Q[n] includes the guest with a l ： 1 ratio between the ＂highest＂ and a ＂higher＂ pH or the ＂lowest＂ and a ＂lower＂ pH; between the higher and the lower pH, the Q[n], even some Q[6]-guest systems, includes the guest with a 1 ： 2 ratio. However, the values of the ＂highest＂, ＂higher lowest lower＂ pH are different for different Q[n]-guest systems, and in this work, a relevant simple method was used to determine these different pH values. Based on the experimental results, the structure of the Q[n] and the guests, the reasons of different interaction models and ratio at different pH were discussed.

关 键 词：紫外吸收光谱 荧光光谱 ^1H NMR技术 主客体包结作用 pH影响 

分 类 号：O625.6[理学—有机化学]