alexa Fundamental Studies of Synthesizing Novel Calix[4]arene Derivative as Host for Treatment of Toxic Metal Cations (Hg2+, Cd2+, Pb2+ and Ag+) | OMICS International | Abstract
ISSN: 2161-0398

Journal of Physical Chemistry & Biophysics
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Research Article

Fundamental Studies of Synthesizing Novel Calix[4]arene Derivative as Host for Treatment of Toxic Metal Cations (Hg2+, Cd2+, Pb2+ and Ag+)

Ahmed Yahya Issa Rubaye*
Department of Chemistry, College of Science, University of Basrah, Basrah, Iraq
Corresponding Author : Ahmed Yahya Issa Rubaye
Department of Chemistry
College of Science, University of Basrah
Basrah, Iraq
Tel: +964772196070 extn. 123
Fax: +9647703231442
E-mail: [email protected]
Received July 23, 2015; Accepted September 04, 2015; Published September 08, 2015
Citation: Rubaye AYI (2015) Fundamental Studies of Synthesizing Novel Calix[4] arene Derivative as Host for Treatment of Toxic Metal Cations (Hg2+, Cd2+, Pb2+ and Ag+). J Phys Chem Biophys 5:184. doi:10.4172/2161-0398.1000184
Copyright: © 2015 Rubaye AYI. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Abstract

Novel calix[4]arene derivative containing mixed pendant arms in its lower rim, 25, 27- bis (diethylamino) ethoxy- 26, 28- (bis-methoxyethoxy) calix[4]arene, L3, has been synthesized to target the heavy metal cations. 1H NMR investigations seems to indicate that the receptor L3 interacts preferentially with Hg2+, Cd2+, Pb2+ and Ag+ in acetonitrile. Complexation studies in acetonitrile show that the lower rim groups of the receptor L3 are the active sites of its interaction with metal ions. These findings are corroborated by conductance measurements in acetonitrile, plots of molar conductance against the ligand/metal cation ratio reveal the formation of 1:1 complexes between this ligand with these cations. Standard thermodynamics parameters of complexation (log Ks, ΔHᵒ c, ΔSᵒ c, ΔGᵒ c) of L3 with Hg2+, Cd2+, Pb2+ and Ag+ in acetonitrile were determined using the Nano ITC (isothermal titration calorimetry). For all the systems investigated, the complexation process between these metal cations and the receptor L3 was enthalpically controlled. The enthalpic and entropic contributions to the Gibbs energy associated with these processes are analysed.

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