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Molecules 2011, 16(9), 8130-8142; doi:10.3390/molecules16098130
Article

Thermodynamic Study of the Complexation of p-Isopropylcalix[6]arene with Cs+ Cation in Dimethylsulfoxide-Acetonitrile Binary Media

1,* , 1
, 1
 and 2
1 Department of Chemistry, Faculty of Sciences, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia 2 Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran
* Author to whom correspondence should be addressed.
Received: 28 June 2011 / Revised: 26 August 2011 / Accepted: 26 August 2011 / Published: 22 September 2011
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Abstract

The complexation reactions between the macrocyclic ionophore, p-isopropylcalix[6]arene and Cs+ cation were studied in dimethylsulfoxide–acetonitrile (DMSO-AN) binary non-aqueous solvents at different temperatures using a conductometry method. The conductance data show that the stoichiometry of the (p-isopropylcalix[6]-arene·Cs)+ complex in all binary mixed solvents is 1:1. The stability of the complexes is affected by the composition of the binary solvent media and a non-linear behavior was observed for changes of log Kf of the complex versus the composition of the binary mixed solvents. The thermodynamic parameters (Dc and Dc) for formation of (p-isopropyl-calix[6]arene·Cs)+ complex were obtained from temperature dependence of the stability constant and the obtained results show that the (p-isopropylcalix[6]arene·Cs)+ complex is enthalpy destabilized, but entropy stabilized, and the values of the mentioned parameters are affected strongly by the nature and composition of the binary mixed solvents.
Keywords: conductometry; dimethylsulfoxide–acetonitrile binary media; p-isopropylcalix-[6]arene; Cs+ cation conductometry; dimethylsulfoxide–acetonitrile binary media; p-isopropylcalix-[6]arene; Cs+ cation
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.

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Ahmadzadeh, S.; Kassim, A.; Rezayi, M.; Rounaghi, G.H. Thermodynamic Study of the Complexation of p-Isopropylcalix[6]arene with Cs+ Cation in Dimethylsulfoxide-Acetonitrile Binary Media. Molecules 2011, 16, 8130-8142.

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