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A Conductometric Study of Complexation Reaction Between Meso-octamethylcalix [4] pyrrole with Titanium Cation in Acetonitrile–Ethanol Binary Mixtures


Citation

Kassim, Anuar and Ahmadzadeh, Saeid and Rezayi, Majid and Rounaghi, Gholam Hossein and Abdollahi, Yadollah (2011) A Conductometric Study of Complexation Reaction Between Meso-octamethylcalix [4] pyrrole with Titanium Cation in Acetonitrile–Ethanol Binary Mixtures. International Journal of Electrochemical Science, 6. pp. 4749-4759.

Abstract

The equilibrium constants and thermodynamic parameters for complexation process between titanium (III) cation and meso-octamethylcalix[4]pyrrole were determined by conductivity measurements in acetonitrile–ethanol (AN–EtOH) binary mixture at different temperatures. The conductance data show that the stoichiometry of the (meso-octamethylcalix[4]pyrrole.[Ti(OH)-(H2O)5])2+ complex in all binary mixed solvents is 1:1[I:M]. The stability of the formed complex is sensitive to the solvent composition and a non-linear behavior was observed for changes of log Kf of this complex versus the composition of the binary mixed solvents. The values of thermodynamic parameters (Hc and Sc) for formation of (meso-octamethylcalix[4]pyrrole.[Ti(OH)-(H2O)5])2+ complex were obtained from temperature dependence of the stability constant using van’t Hoff plots. The obtained results show that the formed complex is enthalpy destabilized, but entropy stabilized and a non-monotonic behavior was observed for variations of standard enthalpy and entropy changes versus the composition of the binary mixed solvents.


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Additional Metadata

Item Type: Article
Divisions: Institute of Advanced Technology
Keywords: meso-octamethylcalix[4]pyrrole, titanium (III) cation, Acetonitrile–ethanol binary solvents, Conductometry
Depositing User: Norhaliza Zainal
Date Deposited: 19 Mar 2012 04:42
Last Modified: 22 Sep 2015 00:07
URI: http://psasir.upm.edu.my/id/eprint/18781
Statistic Details: View Download Statistic

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