Abstract：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 1H 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 “highest” 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.
Key words：UV-Vis absorption spectrum;1H NMR technique;Interaction of host-guest;Influence of pH
曾启华,陶朱*,薛赛凤,祝黔江,牟兰. 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[J]. 光谱学与光谱分析, 2007, 27(09): 1826-1829.
ZENG Qi-hua,TAO Zhu*,XUE Sai-feng,ZHU Qian-jiang,MU Lan. Study on Influence of pH on Interaction of Cucurbit[n=7,8]uril with Two Naphthylamine Isomers . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2007, 27(09): 1826-1829.
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