The Medium Effect on the Selective Complexation of Mercury (II) and Silver (I) by a Fully Substituted Lower Rim Calix[4]arene Receptor

  • Walther B. Aparicio Aragon Altiplano National University
  • Angela F. Danil de Namor University of Surrey
DOI: https://doi.org/10.53555/as.v4i11.2498
Keywords: Mercury, p-tert-Butylcalix[4]arene, Binding, potentiometry, conductometry, Protons, selectivity

Abstract

Mercury has been recognized as a highly dangerous element by the Environmental Protection Agency (EPA) due to its accumulative and persistent character in the environment and biota. In the Latin American region several countries are affected by the extremely high contents of mercury in the environmental and consequently in water, therefore the aim of this research is to synthesize receptors able to interact selectively with mercury species.

This paper reports the synthesis of a novel lower rim calix[4]arene derivative with pendent arms containing oxygen, phosphorus and sulphur as donor atoms, (1). Spectrometric (1H NMR) measurements were performed to determine the actives site of complexation of this ligand and the mercury (II) and silver (I) cations in solution. Conductance data provide information regarding the composition of the metal-ion complex in acetonitrile and methanol. The stability constant of the mercury (II) and silver (I) complex was derived from direct potentiometric titration. The latter technique was also used to characterize the thermochemical character of the binding process

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Author Biographies

Walther B. Aparicio Aragon, Altiplano National University

School of Chemical Engineering, Chemical Engineering Department, Altiplano National University, Puno/Peru

Angela F. Danil de Namor, University of Surrey

School of Biomedical and Molecular Sciences, Chemistry division, University of Surrey, Guildford, Surrey GU2 7XH

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Published
2018-11-30
How to Cite
Aragon, W. B. A., & Namor, A. F. D. de. (2018). The Medium Effect on the Selective Complexation of Mercury (II) and Silver (I) by a Fully Substituted Lower Rim Calix[4]arene Receptor. IJRDO-Journal of Applied Science, 4(11), 20-26. https://doi.org/10.53555/as.v4i11.2498
Issue
Vol. 4 No. 11 (2018): IJRDO - Journal of Applied Science | ISSN: 2455-6653
Section
Articles

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