A thermodynamic study of interaction of Ag+, Mg2+, Ca2+, and K+ cations with 4-hydroxyphenyl-2,5-bis(2-benzofuranyl)pyridine in some binary mixed non-aqueous solvents
- 作者: Khoshnood R.1, Hatami E.1, Arefi D.1, Maknoni F.1
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隶属关系:
- Department of Chemistry, Mashhad Branch
- 期: 卷 90, 编号 2 (2016)
- 页面: 308-317
- 栏目: Physical Chemistry of Solutions
- URL: https://journals.rcsi.science/0036-0244/article/view/167468
- DOI: https://doi.org/10.1134/S0036024415130300
- ID: 167468
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详细
In the present work the complexation process between Ag+ and Mg2+ cations and 4-hydroxyphenyl-2,5-bis(2-benzofuranyl)pyridine (HBFPY) ligand was studied in pure dimethylformamide (DMF), ethanol (EtOH), acetonitrile (AN) and in (DMF-EtOH), (AN-EtOH) and (DMF-AN) binary mixed solvent solutions at different temperatures using the conductometric method. Also in this work the complexation reaction between Ca2+, K+ cations and HBFPY ligand, was studied in pure dimethylformamide (DMF), propanol (PrOH), 1,4-dioxane (DOX), ethanol (EtOH) and in DMF-PrOH, DMF-DOX and DMF-EtOH binary mixed solvent solutions at different temperatures using the conductometric method. The conductance data show that the stoichiometry of the complexes formed between this ligand and the studied cations is 1 : 1 [ML]. In most cases, addition of HBFPY to solutions of these cations, causes a continuous increase in the molar conductivities which indicates that the mobility of complexed cations is more than the uncomplexed ones. The stability constants of the complexes were obtained from fitting of molar conductivity curves using a computer program, GENPLOT. The stability constant of [Mg(HBFPY)]2+ complex in various neat solvents at 15°C decreases in order: EtOH > DMF > AN and the stability constant of [Ag(HBFPY)]+ complex in various neat solvents at 35°C decreases in order: DMF > EtOH. The values of standard enthalpy changes (ΔH°c) for complexation reactions were obtained from the slope of the Van’t Hoff plots and the changes in standard entropy (ΔS°c) were calculated from the relationship ΔH°c,295.15= ΔH°c–298.15ΔS°c.
作者简介
Razieh Khoshnood
Department of Chemistry, Mashhad Branch
编辑信件的主要联系方式.
Email: rskhoshnood@yahoo.com
伊朗伊斯兰共和国, Mashhad
Elaheh Hatami
Department of Chemistry, Mashhad Branch
Email: rskhoshnood@yahoo.com
伊朗伊斯兰共和国, Mashhad
Donya Arefi
Department of Chemistry, Mashhad Branch
Email: rskhoshnood@yahoo.com
伊朗伊斯兰共和国, Mashhad
Fatemeh Maknoni
Department of Chemistry, Mashhad Branch
Email: rskhoshnood@yahoo.com
伊朗伊斯兰共和国, Mashhad