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Title of Journal: J Incl Phenom Macrocycl Chem

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Abbravation: Journal of Inclusion Phenomena and Macrocyclic Chemistry

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Springer Netherlands

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DOI

10.1016/0191-8869(96)00117-1

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ISSN

1573-1111

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Thermodynamics of ZrOSuperscript2+/Superscript

Authors: Gholam Hossein Rounaghi Behjat Deiminiat Somayeh Tarahomi
Publish Date: 2011/08/18
Volume: 73, Issue: 1-4, Pages: 67-73
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Abstract

The complexation reaction of dibenzo18crown6 DB18C6 with ZrO2+ cation was studied in some binary solvent solutions of acetonitrile AN 12 dichloroethane DCE nitromethane NM and ethylacetate EtOAc with methanol MeOH at different temperatures by conductometry method The stability constant of the resulting 11 complex at each temperature was determined using a computer fitting conductancemole ratio data The results revealed that the DB18C6·ZrO2+ complex is more stable in the EtOAc–MeOH binary mixed solvents compared with the other binary mixed solvent solutions A nonlinear relationship was observed for changes of log Kf of DB18C6·ZrO2+ complex versus the composition of the binary mixed solvents The corresponding standard thermodynamic parameters ΔH c ° ΔS c ° were obtained from temperature dependence of the stability constant The results show that the DB18C6·ZrO2+ complex is enthalpy destabilized but entropy stabilized and the values along with the sign of these parameters are influenced by the nature and composition of the mixed solvents

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