Volume 20, Issue 4 pp. 322-326
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Interaction of Sulfonated Calix[n]arenes with Rhodamine B and Its Application to Determine Acetylcholine in a Real Neutral Aqueous Medium

Yong-Jun Zhang

Yong-Jun Zhang

College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

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Wei-Xiao Cao

Wei-Xiao Cao

College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

E-mail: [email protected]

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Jian Xu

Jian Xu

Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China

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First published: 26 August 2010
Citations: 25

Abstract

Complexation between Rhodamine B (RB) and sulfonated calix [n] arenes (SCnA) were studied by means of UV-vis spectroscopy and fluorescence spectroscopy. In the presence of sulfonated calix[n] arenes, the absorption band of Rhodamine B shifts to longer wavelength and its intensity decreases. The formation of a host-guest type complex also results in the fluorescence quenching of Rhodamine B. The association constants for the RB/SCnA complexes increase in the order of SC4A < SC6A < SC8A and show dependence on the size of the cavities of the calixarenes. The fluorescence is selectively regenerated by adding acetylcholine. Based on this observation, a method to determine acetylcholine in a real neutral aqueous medium was developed.

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