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Vol. 27 No. 4 (2015): Vol 27 Issue 4

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Spectral Study on Selective Encapsulation and Complexation of Chloroform by Cryptophane-E-(OEt)6

https://doi.org/10.14233/ajchem.2015.17546
C. Tao
School of Optoelectronic Information, Chongqing University of Technology, Chongqing 400054, P.R. China
X. Li
College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, P.R. China
J. Li
Chongqing Medical and Pharmaceutical College, Chongqing 401331, P.R. China
Y. Shi
College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, P.R. China

Corresponding Author(s) : C. Tao

taochuanyi@cqut.edu.cn; taochuanyi@qq.com

Asian Journal of Chemistry, Vol. 27 No. 4 (2015): Vol 27 Issue 4

Abstract

Cryptophane-E-(OEt)6 was synthesized and investigated the interaction with chloroform by fluorescence spectroscopy. The results indicate that cryptophane-E-(OEt)6 is able to selectively encapsulate chloroform. The variation of the fluorescence spectra in binary solvents with the increasing chloroform ratio suggests that cryptophane-E-(OEt)6 and chloroform can form a 1:1 complex and the binding constant is estimated to be 235 M-1, which is much smaller than the binding constant of cryptophane-E to chloroform. Without appreciable consequences on the cavity dimensions, the replacement of methoxy group in cryptophane-E by ethoxy substituents restricts the cross section of the host windows. This is mostly due to steric constraint of the larger ethoxy substituent.

Keywords

Cryptophane Chloroform Binding Complex Encapsulation Fluorescence
Tao, C., Li, X., Li, J., & Shi, Y. (2015). Spectral Study on Selective Encapsulation and Complexation of Chloroform by Cryptophane-E-(OEt)6. Asian Journal of Chemistry, 27(4), 1269–1273. https://doi.org/10.14233/ajchem.2015.17546
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