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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 (CC BY 3.0).
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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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