Polarographic Study of Stability Constants of Copper(II) Complexes with β-picoline, Malic and Tartaric Acid

Abstract

The mixed ligand complexes of b-picoline (b-pico), malate (mal^2–) and tartrate (tart^2–) with Cu(II) have been studied polarographically at constant ionic strength (μ = 1.5 M (NaNO₃) and pH 5.95 at 25 ± 0.1°C). The reduction of the complexes at d.m.e. is reversible and diffusion-controlled. Two mixed complexes, [Cu(b-pico)(mal)] and [Cu(b-pico)(tart)] are formed. Their stability constants are found to be log b₁₁ = 5.0360 and log b₁₁ = 4.8932, respectively at 25°C.