Co(II), Cu(II) and Zn(II) dinuclear complexes of a polypodal ligand containing phenolate and pyridyl donor groups

Acetate and perchlorate dinuclear metal complexes of Co(II), Cu(II) and Zn(II) with the cresolate polypodal ligand having mixed phenolate and pyridyl pendant functionalities, H3L, have been synthesized. The complexes were characterized by microanalysis, LSI mass spectrometry, IR, UV–Vis spectroscopy, magnetic studies and conductivity measurements. Crystal structures of H3L, [Cu2(HL)(OAc)(H2O)2](OAc)·1.5H2O and [Zn2L(CH3OH)3](ClO4)CH3OH·2H2O complexes, have been also determined.The X-ray studies show the presence of dinuclear complexes with the metal ions joined by the bridging cresolate group and coordinated to the tertiary amine nitrogen and their corresponding attached pyridyl and phenol/phenolate pendant groups. The coordination environment for the metal ions is completed by acetate, water or solvent molecules to generate mixed distorted coordination geometries; square plane/square pyramidal for Cu(II) and octahedral/trigonal bipyramidal for Zn(II) complexes. Different intramolecular interactions through hydrogen bonds are also observed in both complexes.

The acetate Co(II), Cu(II) and Zn(II) complexes of the potential trianionic, septadentate, N4O3, donor cresolate polypodal ligand, H3L, have been synthesized in methanol. The in situ metathesis reaction with sodium perchlorate let obtain the corresponding perchlorate complexes. The crystal structure of H3L as well as of [Cu2(HL)(OAc)(H2O)2](OAc)·1.5H2O and [Zn2L(CH3OH)3](ClO4)CH3OH·2H2O complexes, have been determined. All the complexes are dinuclear acting the cresolate group as bridge between the metal ions. The X-ray structures show the two metal ions in different coordination environment. In the case of the Cu(II) complex, the metal ions present square planar and square pyramidal geometries. For the Zn(II) complex, the metal ions present a distorted octahedral and trigonal bipyramidal geometries. Different intramolecular interactions through hydrogen bonds are also observed in both complexes.Figure optionsDownload as PowerPoint slide