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Supramolecular Chemistry Volume 24, 2012 - Issue 12
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Original Articles

Synthesis, characterisation and properties of star polypseudorotaxanes with cucurbit[7]uril

Hui Yang The Key Laboratory of Special Functional Aggregated Materials, Shandong University, Ministry of Education, Jinan, 250100, P.R. China
,
Caiyu Song The Key Laboratory of Special Functional Aggregated Materials, Shandong University, Ministry of Education, Jinan, 250100, P.R. China
,
Hao Chen The Key Laboratory of Special Functional Aggregated Materials, Shandong University, Ministry of Education, Jinan, 250100, P.R. China
,
Wenchao Xu The Key Laboratory of Special Functional Aggregated Materials, Shandong University, Ministry of Education, Jinan, 250100, P.R. China
&
Yebang Tan The Key Laboratory of Special Functional Aggregated Materials, Shandong University, Ministry of Education, Jinan, 250100, P.R. China; School of Chemistry and Chemical Engineering Shandong University, Jinan, 250100, P.R. ChinaCorrespondence[email protected]
Pages 833-840 | Received 31 Jul 2012, Accepted 13 Sep 2012, Published online: 17 Oct 2012
 
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Abstract

New star polypseudorotaxanes that include 4,4′-dipyridyl-terminated 4-arm-poly(ethylene glycol) (PC1) and cucurbit[7]uril (CB[7]) were easily synthesised. The 1H NMR, UV–vis and resonance light scattering (RLS) data show that the viologen units of the star polypseudorotaxanes could fall off from the hydrophobic cavity of CB[7] with the addition of 1-adamantylamine (ADA). The cyclic voltammograms results indicate that the star polypseudorotaxanes have the redox property with the addition of ADA compared with the non-redox property of the pure star polypseudorotaxanes. The biological toxicity experiment shows that the bactericidal activity of the star polypseudorotaxanes in Escherichia coli was aroused by adjusting CB[7] dethreading from the star polypseudorotaxanes with the addition of another competitive guest ADA, which has a very high affinity for CB[7].

Acknowledgements

The authors are grateful for the financial support from the National Natural Science Foundation of China (No. 20674045), National Basic Research Program of China (973 Program, 2009CB930103) and Shandong Provincial Natural Science Foundation (ZR2011BM002).

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