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 Razieh Sanavi^*; Hatami Elaheh; Arefi Donya; Maknoni Fatemeh Zahra

来源：Russian Journal of Physical Chemistry, 2016, 90(2): 308-317.

DOI：10.1134/S0036024415130300

• conductometry
• dimethylformamide
• propanol
• dioxan
• ethanol
• acetonitrile
• Ca2+
• K+
• Ag+
• Mg2+

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 15A degrees C decreases in order: EtOH > DMF > AN and the stability constant of [Ag(HBFPY)](+) complex in various neat solvents at 35A degrees C decreases in order: DMF > EtOH.

• 出版日期2016-2