Abstract
The interaction of Ni(II) and Zn(II) with picolinic acid and pipecolinic acid has been studied by potentiometric titrations at 0, 25, and 40°C and ionic strength of 0·02 M in 1-propanol-water mixtures. Dissociation constants of the ligands and formation constants of the chelates containing 1:1 and 1:2 molar ratios of metal ion to ligand in a dielectric constant range of 30–80 are reported. A computer program used in obtaining the dissociation constants is discussed. The predominance of the neutral molecule over the zwitterion form for picolinic acid is discussed.
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