Francisco Hueso-Ureńa, Nuria A. Illán-Cabeza, Miguel N. Moreno-Carretero* and Antonio L. Peńas-Chamorro
Departamento de Química Inorgánica y Orgánica, Universidad de Jaén, 23071-Jaén, Spain
 

ABSTRACT

The synthesis and spectroscopic characterization of complexes of Ni^II, Cu^II, Zn^II and Cd^II containing hydrazones derived from 6-amino-5-formyl-1,3-dimethyluracil and nicotinic and isonicotinic acid hydrazides are reported. In all cases, the complexes appear to be monomeric and four-coordinated, with three binding sites occupied by the dinegative tridentate  ligand, which makes two five- and six-membered chelate rings and the fourth position occupied by either water or ammonia. The coordination of the organic ligand takes place through the deprotonated N6 atom from the 6-amino group, the N51 azomethine atom and the O52 oxygen from the hydrazide moiety. Experimental data indicate that neither carbonyl oxygen atoms from the uracil ring nor the endocyclic nitrogen atom from pyridine are involved in the coordination to the metal.