Determination of Stability Constants of N-[5-Methylsalicylidene] -Benzylamine Complexes with Y3+, La3+, Pr3+, Nd3+, Sm3+, Gd3+ and Dy3+

Department of Chemistry, Ramnarain Ruia College, Matunga, Bombay-400 019

Manuscript received 12 August 1980, accepted 23 February 1981

Potentiometric studies have been carried out on metal complexes of  Y^3+,  La³⁺, Pr³⁺, Nd³⁺, Sm³⁺, Gd³⁺ and Dy³⁺  with N-[5-methylsalicylidene]-benzylamine. The proton association constants (pK₁ and pK₂) of the reagent and the formation constants of  its metal complexes have been determined by Bjerrum's method at 25 \(\pm\)  0.1˚ and at ionic strength 0.1 M  in 75: 25 percent (v/v) dioxan-water medium. The order of stability constants of  the chelates is found to  Dy³⁺ > Sm³⁺ > Gd³⁺ > Y³⁺ > Nd³⁺ > Pr³⁺ > La³⁺.