Electrochemical Studies for Cation Recognition with Diazo-Coupled Calix4arenesReportar como inadecuado




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Journal of Analytical Methods in Chemistry - Volume 2015 2015, Article ID 579463, 7 pages -

Research ArticleDepartment of Chemistry, Soonchunhyang University, Asan 336-746, Republic of Korea

Received 2 October 2014; Revised 19 December 2014; Accepted 2 January 2015

Academic Editor: Bengi Uslu

Copyright © 2015 Bongsu Kim and Tae Hyun Kim. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The electrochemical properties of diazophenylcalix4arenes bearing ortho-carboxyl group o-CAC and ortho-ester group o-EAC, respectively, in the presence of various metal ions were investigated by voltammetry in CH3CN. o-CAC and o-EAC showed voltammetric changes toward divalent metal ions and no significant changes with monovalent alkali metal ions. However, o-CAC preferentially binds with alkaline earth and transition metal ions, whereas no significant changes in voltammetric signals are observed in o-EAC with alkaline earth metal ions. o-EAC only binds with other transition metal ions. This can be explained on metal ion complexation-induced release of proton from the azophenol to the quinone-hydrazone tautomer followed by internal complexation of the metal ion with aid of nitrogen atoms and ortho-carbonyl groups in the diazophenylazocalix4arenes.





Autor: Bongsu Kim and Tae Hyun Kim

Fuente: https://www.hindawi.com/



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