Polarographic Study of Stability Constants of Cadmium(II) Complexes with p-picoline and Some Hydroxy Acids

摘要

The mixed ligand complexes of P-picoline (P-pico),malate (mal~(2-)) and tartrate (tart~(2-)) with Cd(II) have been studied polaro-graphically at constant ionic strength (u = 1.5 M,NaNC>3) and pH 5.95 at 25 + O.rC.The reduction of the complexes at d.m.e.is reversible and diffusion-controlled.Three mixed complexes [Cd(mal)(P-pico)],[Cd(mal)(p"-pico)2] and [Cd(mal)2(P-pico)]2~ are formed in Cd(II) p-picoline-malate system with the stability constants log log P,| = 2.7224,log P12 = 4.2805 and log p2) = 3.9661.Two mixed complexes [Cd(P-pico)(tart)J and [Cd(P-picoh(tart)] are formed in Cd-P-picoIine-tartrate system and their stability constants are found to be log Pi| =2.1368 and log Pn = 4.1065,respectively.