Transition-metal complexes of the 1,2-dipyridylethylene isomers. Part III. Cobalt(II), nickel(II), and copper(II) nitrato-derivatives

Abstract

The cobalt(II), nickel(II), and copper(II) nitrato-complexes of 1,2-di-(2-pyridyl)-, 1,2-di-(4-pyridyl)-, 1-(2-pyridyl)-2-(3-pyridyl)-, and 1-(2-pyridyl)-2-(4-pyridyl)-ethylene are described, and their structures interpreted on the basis of magnetic and spectral properties. The two main types of complex isolated have stoicheio-metries M(NO₃)₂L and M(NO₃)₂L₂(L = ligand), the former being co-ordination polymers of the type [M(NO₃)₂L]_n.