Complexation and Thermodynamic Studies of a New Schiff base Ligand with Some Metallic ions in Nonaqueous Solvents by Conductometric Method
Publish place: Iranian Journal of Analytical Chemistry، Vol: 7، Issue: 2
Publish Year: 1399
نوع سند: مقاله ژورنالی
زبان: English
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JR_IJAC-7-2_008
تاریخ نمایه سازی: 1 مرداد 1401
Abstract:
The complexation reactions between N-N′-Bis(۵-bromo-۲-hydroxybenzylidene)-۲,۲-dimethylpropane-۱,۳-diamine Schiff base ligand and Ag+, Cd۲+, Co۲+, Cu۲+, Hg۲+, Ni۲+, and Zn۲+ ions were studied conductometrically in acetonitrile, dimethylformamide, ethanol, and methanol solvents at ۵, ۱۰, ۱۵, and ۲۵ºC. The formation constants of the resulting ML and M۲L complexes were calculated from the computer fitting of the molar conductance-mole ratio data at different temperatures. The selectivity of the Schiff base ligand to the cations is depended the nature of the solvent. At ۲۵ºC in acetonitrile solvent, the stability of the resulting complexes varied in the order Hg۲+ > Ag+ > Cd۲+ > Cu۲+ > Co۲+ > Zn۲+ > Ni۲+. It was found that the stability of the resulting complexes decreased with increasing the solvation ability of the solvent. The values of the thermodynamic parameters (ΔH°, ΔS° and ΔG°) for complexation reactions were obtained from the temperature dependence of the stability constants values (log Kf) using the Van’t Hoff plots. In most cases, the complexes were found to be an enthalpy and entropy stabilized.
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Authors
Mahmood Payehghadr
Department of Chemistry, Payame Noor University, PO Box ۱۹۳۹۵-۴۶۹۷, Tehran, Iran
Seied Ebrahim Hashemi
Department of Chemistry, Payame Noor University, PO Box ۱۹۳۹۵-۴۶۹۷, Tehran, Iran
Zarin Eshaghi
Department of Chemistry, Payame Noor University, PO Box ۱۹۳۹۵-۴۶۹۷, Tehran, Iran
Hadi Kargar
Department of Chemical Engineering, Ardakan University, P. O. Box: ۱۸۴, Ardakan, Yazd, Iran
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