Table of Contents
Research Letters in Organic Chemistry
Volume 2009 (2009), Article ID 601089, 5 pages
http://dx.doi.org/10.1155/2009/601089
Research Letter

Synthesis of a New Calix[4]Arene and Its Application in Construction of a Highly Selective Silver Ion-Selective Membrane Electrode

1Department of Chemistry, Islamic Azad University, North Tehran Branch, P.O. Box 19585-936, Tehran, Iran
2Chemistry and Chemical Engineering Research Center of Iran, P.O. Box 14335-186, Tehran, Iran
3Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, P.O. Box 14155-6455, Tehran, Iran

Received 14 April 2009; Accepted 17 June 2009

Academic Editor: Cyril Parkanyi

Copyright © 2009 Saeed Taghvaei-Ganjali et al. 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

A PVC membrane sensor for Ag (I) ions has been prepared. The membrane has 5, 11, 17, 23-tetra-tert-butyl-25-(3-N, N-diethyldithio carbamoylpropoxy)-26,27,28-tris-propoxy calix[4]arene (CAD) as a carrier. It was found that the sensor exhibits a Nernstian response for A g + ions over a wide concentration range (10−2–10−6 M). Additionally, it illustrates a fast response time (about 5 seconds), and it can be used for at least 2 months without any considerable divergence in potentials. The nature of the plasticizer, the additive, the concentration of internal solutions in the electrodes, and the composition of the membrane were investigated. Furthermore, the suggested membrane electrode revealed good selectivities for A g + over a variety of other metal cations, and it could be used in the pH range of 3.0–7.0. Eventually, it was successfully applied as an indicator electrode for the potentiometric titration of A g + ion with NaCl.