Potentiometric Studies on the Complexes of Some Trivalent Metal Ions with N-(2-Hydroxy-5-Phenylbenzylidene) 2,4-Dimethylaniline

Department of Chemistry, Ramnarain Ruia College, Matunga, Bombay-400 010

Manuscript received 23 February 1982, accepted 28 December 1982

Potentiometric studies have been carried out on metal complexes of Y³⁺, Pr³⁺, Nd³⁺, Sm³⁺, Gd³⁺ and Dy³⁺ with N-(2-hydroxy-5-phenylbenzylidene) 2,4-dimethyl­aniline. The formation constants (\(p\)K₁ and \(p\)K₂) of the reagent and the dissociation constants of its metal complexes have been determined by Bjerrum's method at 30+0.1° and at ionic strength 0.1 Min 75 : 25 percent (v/v) dioxane-water medium. The order of stability constants of the chelates is found to be Pr²⁺>Nd²⁺>Y²⁺> Dy²⁺>Gd²⁺>Sm²⁺.