光谱法研究体系pH对七、八元瓜环与萘胺异构体相互作用的影响  

Study on Influence of pH on Interaction of Cucurbit[n=7,8]uril with Two Naphthylamine Isomers

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

机构地区:[1]贵州大学理学院应用化学研究所,贵州贵阳550025

出  处:《光谱学与光谱分析》2007年第9期1826-1829,共4页Spectroscopy and Spectral Analysis

基  金:国家自然科学基金项目(200261002);国际科技合作重点项目计划项目(2003DF000030);贵州省省长基金项目;贵州省教育厅自然科学研究项目资助

摘  要:利用紫外吸收光谱方法和^1HNMR技术考察了体系pH对七、八元瓜环(Q[7],Q[8])与萘胺异构体的相互作用的影响。实验结果表明,Q[7]与萘胺异构体在-0.3〈pH〈8范围内均是以主客体物质的量之比为1:1的方式相互作用,在8〈pH〈14的范围内,观察不到相互作用;Q[8]与萘胺异构体相互作用体系在pH为-0.3~14的范围内,呈现了5个作用阶段:在“较高”的pH范围,瓜环与萘胺异构体发生相互作用,形成1:1的包结配合物;在“较低”的pH范围,主客体存在1:1和1:2两种作用模式的竞争;而在介于“较高”与“较低”之间的pH范围,Q[8]与这些客体发生相互作用,形成1:2的包结配合物。The interaction of cucurbit[n=7, 8]urils(Q[7], Q[8]) with two naphthylamine isomers and the influence of pH on the interaction were studied by using UV-Vis spectroscopy and^ 1 H NMR technique. The experimental results revealed that Q[7] always forms a 1 : 1 complex with the naphthylamine isomers respectively in the pH range (-0.3〈pH〈8) and the interaction of Q[7] with the title guests was not observed in the 8〈pH〈14 range. However, there are five interaction stages for Q[8]- naphthylamine isomer systems, no obvious interaction between the host Q[8] and the title naphthylamine guest(s) at the "high- est" and the "lowest" pH (pH〉14 and pH〈-0. 3 respectively) ; the Q[8] could include the guest with a 1 : 1 ratio between the "highest" and a "higher" pH or the "lowest" and a "lower" pH (-0. 3〈pH〈4 and 9. 5〈pH〈14) ; between the higher and the lower pH (4〈pH〈9.5), the Q[8] includes the guest and forms a inclusion complex with 1 : 2 ratio of host to guest.

关 键 词:紫外吸收光谱 ^1HNMR技术 主客体包结作用 pH影响 

分 类 号:O657.3[理学—分析化学]

 

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