The solvent extraction of metal complexes of pyridine-2-aldehyde-2'-pyridylhydrazone

The distribution behaviour of the complexes formed between the terdentate ligand, pyridine-2-aldehyde-2'-pyridylhydrazone, and Zn(II), Cd(II), Fe(II), Cu(II), Ni(II), Mn(II) and Pd(II) has been studied between aqueous buffer and chloroform. Results are interpreted in terms of the complexes in the aqueous solution and the loss of a proton from each coordinated ligand to form an uncharged, extractable species. The suitability of PAPHY as a spectrophotometric reagent used in conjunction with a solvent extraction procedure is discussed.