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 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; in revised form: 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

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MDPI and ACS Style

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.

AMA Style

Ahmadzadeh S, Kassim A, Rezayi M, Rounaghi GH. Thermodynamic Study of the Complexation of p-Isopropylcalix[6]arene with Cs+ Cation in Dimethylsulfoxide-Acetonitrile Binary Media. Molecules. 2011; 16(9):8130-8142.

Chicago/Turabian Style

Ahmadzadeh, Saeid; Kassim, Anuar; Rezayi, Majid; Rounaghi, Gholam Hossein. 2011. "Thermodynamic Study of the Complexation of p-Isopropylcalix[6]arene with Cs+ Cation in Dimethylsulfoxide-Acetonitrile Binary Media." Molecules 16, no. 9: 8130-8142.

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