Development of Copper-Selective Potentiometric Sensor Using a New Ion Carrier: A Theoretical and Experimental Study

A. Panahi Sarmad A. Panahi Sarmad , L. Hajiaghababaei L. Hajiaghababaei , A. S. Shahvelayati A. S. Shahvelayati , J. Najafpour J. Najafpour
Russian Journal of Electrochemistry
Abstract / Full Text

The most stable conformer of a ligand (i.e., 2-(2-((4-methoxybenzoyl)imino)-4-(4-methoxyphenyl) thiazol-3(2H)-yl)-2-phenylacetic acid) and its isosteric complexes with different cations were determined through the MMFF94 method based on molecular mechanics. The results of the Gibbs free energy of the reaction by B3LYP/6-31G(d) calculation level in which 6-31G(d) base level for heavy metals replaced by LanL2DZ show that the thermodynamic complexation reactivity of Cu2+ and the ligand was maximal. Consequently, the mentioned ligand was used to construct a Cu2+ ion-selective electrode. The developed liquid membrane electrode showed a Nernstian response (33.33 ± 2.71 mV per decade of concentration) from 1.0 × 10–1 to 1.0 × 10–6 mol L–1. The detection limit of the sensor was determined as 9.0 × 10–7 mol L–1. The electrode had a short response time around 10 s and was applicable in the pH range of 5.0–8.0. Moreover, the sensor was successfully used in the potentiometric titration of Cu2+ with EDTA and also in the direct determination of Cu2+.

Author information
  • Department of Chemistry, Islamic Azad University, Yadegar-e-Imam Khomeini (RAH) Shahre Rey Branch, Tehran, Iran

    A. Panahi Sarmad, L. Hajiaghababaei, A. S. Shahvelayati & J. Najafpour

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