Co(II), Ni(II) and Cu(II) metal complexes with a N8 azamacrocyclic ligand

Hydrated nitrate and perchlorate salts of the transitional metal ions Co2+, Ni2+ and Cu2+ have been used to investigate the coordination capability of the octaaza macrocycle L derived from 2,6-diformylpyridine and diethylenetriamine. The synthesis of the metal complexes was carried out in 1:1 and 2:1 metal:ligand molar ratios, but dinuclear complexes were obtained in all cases due to the size of the 24-membered ligand. The complexes have been characterized by elemental analysis, molar conductivity, mass spectrometry, IR spectroscopy, diffuse reflectance and magnetic measurements. The dinuclear nature of the compounds was confirmed by X-ray diffraction. The crystal structures of [Ni2L(NO3)2](NO3)2, [Cu2L(NO3)4] and [Cu2L(ClO4)4], were determined.

Graphical abstractHydrated nitrate and perchlorate salts of the transitional metal ions Co2+, Ni2+ and Cu2+ have been used to investigate the coordination capability of the octaaza macrocycle L derived from 2,6-diformylpyridine and diethylenetriamine. The synthesis of the metal complexes was carried out in 1:1 and 2:1 metal:ligand molar ratios, but dinuclear complexes were obtained in all cases. The complexes have been characterized by elemental analysis, molar conductivity, mass spectrometry, IR spectroscopy, diffuse reflectance and magnetic measurements. The crystal structures of [Ni2L(NO3)2](NO3)2, [Cu2L(NO3)4] and [Cu2L(ClO4)4] have been determined.Figure optionsDownload full-size imageDownload as PowerPoint slide