SYNTHESIS, CHARACTERIZATION AND DYEING PROPERTIES OF COPPER(II), NICKEL(II) AND COBALT(III) COMPLEXES OF 2-PYRIDYLMETHYLENE-1-AMINO-2-NAPHTHOL

Synthetic methods for the preparation of the heterocyclic ligand 2-pyr idylmethylene-1-amino-2-naphthol (PMAN) and its complexes with copper( II), nickel(II) and cobalt(III) are described. The structure of the li gand and of its metal complexes has been investigated by IR, UV/VIS an d mass spectroscopy, and by elemental analysis. It has been found that the azomethine compound MAN behaves as a tridentate ligand which form s various types of complexes. The Cu(II)-PMAN complex tends to form a chelate of ML type and with perchlorate as an anion. The Ni(II)-PMAN c omplex forms an ML2 type of neutral complex, while the Co(III)-PMAN co mplex has the same ML2 stoichiometry, but with perchlorate as an anion . The dyestuffs have been used for wool dyeing under a controlled dyei ng process. Parameters such as the optimal dyeing temperature, exhaust ion with time and fixing on fabrics under acidic conditions have been determined.