Electrical conductance of some transition metal complexes in both water and dioxane—water mixtures at 25°C

✍ Scribed by Amina M. Hafez; M.M. Osman; M.M. El-Kholy

• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 655 KB
• Volume: 30
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(85)80045-1

✦ Synopsis

Equivalent conductances of [Cu(en),]X, and [Ni(en)s]XI (X = Cl, Br and I) solutions in both water and dioxane-water mixtures at 25°C were measured in different compositions covering the range 0.00-53.00 wt. "/.. The data were anal@ using the Fuoss-Edelson method to obtain the limiting equivalent conductance A0 and the association constant K, simultaneously. The distance of closest approach 0' was calculated using Stokes' equation and related to K,. In water, it was found that the limiting cationic conductance decreases with the decrease of the cationic size, and the values of the association constant KA indicate incomplete dissociation of complexes in water and unremarkable change of K, with the change of the counter anion. But in dioxane-water mixtures, it was found that the limiting cationic conductance is directly proportional to the dielectric constant D, while the association constant K, is inversly proportional to it, except at low dioxane content for the complexes [Cu(en),]Br,, [Ni(en),]CI, and [Ni(en)s]Br,. Where K, reaches a minimum value at 15.72, 11.93 and 5.14 dioxane wt.% respectively.