Solvent influence on complex formation between Cd2+ and 2-hydroxy-1,4-naphthoquinone in binary mixed nonaqueous solvents at 15–45°C
- Authors: Farazandeh R.1, Rounaghi G.H.1, Ebrahimi M.1, Basafa S.1
-
Affiliations:
- Department of Chemistry, Faculty of Sciences
- Issue: Vol 91, No 4 (2017)
- Pages: 678-684
- Section: Physical Chemistry of Solutions
- URL: https://journals.rcsi.science/0036-0244/article/view/169401
- DOI: https://doi.org/10.1134/S0036024417040082
- ID: 169401
Cite item
Abstract
The complexation reaction of Cd2+ cation with 2-hydroxy-1,4-naphthoquinone (HNQ) was studied in acetonitrile (AN), 2-PrOH, ethyl acetate (EtOAc), EtOH, dimethylformamide (DMF) and in binary solutions AN–2-PrOH, AN–DMF, AN–EtOH, and AN–EtOAc using conductometric method at 15–45°C. The conductance data show that the stoichiometry of the Cd2+ complex with HNQ in all solvent systems is 1 : 1. In the pure solvents the stability of the complex changes in the order AN > 2-PrOH > EtOH > DMF. The stability of the complex at 25°C in the studied mixtures changes in the following order : AN−EtOAc > AN−2-PrOH > AN−EtOH > AN−DMF. These orders are affected by the nature and composition of the solvent systems and by the temperature. From the temperature dependence data, the thermodynamic functions values (ΔH° and ΔS°) for the complex formation were calculated.
About the authors
R. Farazandeh
Department of Chemistry, Faculty of Sciences
Email: ghrounaghi@yahoo.com
Iran, Islamic Republic of, Mashhad
G. H. Rounaghi
Department of Chemistry, Faculty of Sciences
Author for correspondence.
Email: ghrounaghi@yahoo.com
Iran, Islamic Republic of, Mashhad
M. Ebrahimi
Department of Chemistry, Faculty of Sciences
Email: ghrounaghi@yahoo.com
Iran, Islamic Republic of, Mashhad
S. Basafa
Department of Chemistry, Faculty of Sciences
Email: ghrounaghi@yahoo.com
Iran, Islamic Republic of, Mashhad