光谱学与光谱分析 |
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Study on Influence of pH on Interaction of Cucurbit[n=7,8]uril with Two Naphthylamine Isomers |
ZENG Qi-hua,TAO Zhu*,XUE Sai-feng,ZHU Qian-jiang,MU Lan |
Institute of Applied Chemistry,Guizhou University,Guiyang 550025, China |
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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.
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Received: 2006-06-16
Accepted: 2006-10-08
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Corresponding Authors:
TAO Zhu
E-mail: gzutao@263.net
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Cite this article: |
ZENG Qi-hua,TAO Zhu,XUE Sai-feng, et al. Study on Influence of pH on Interaction of Cucurbit[n=7,8]uril with Two Naphthylamine Isomers [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2007, 27(09): 1826-1829.
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URL: |
https://www.gpxygpfx.com/EN/Y2007/V27/I09/1826 |
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