title: Study of Cu(II)-hydrazine-6-methylpicolinaldehyde system: A new "in situ" reaction.
abstract: The Cu(II)-hydrazine-6-methylpicolinaldehyde system in solution is studied. The "in situ" reactions, based on the formation of a ligand by condensation of an amine and an aldehyde in the presence of the metal ion, and the consequent formation of the coloured Cu(I)-azine and Cu(l)-hydrazone complexes are reported. A new mode of homogeneous colour development, based on the exchange of groups in the ligand with the metal ion present, is also described. The results are compared with those obtained with the previously synthesized reagents.
authors.affiliation: Department of Analytical Chemistry Faculty of Sciences University of Sevilla Sevilla, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Valcarcel
authors.forename: F
authors.initials: F
authors.lastname: Pino