Transition-metal quinoxaline complexes. Part III. Copper(II) derivatives with substituted quinoxalines

Abstract

Copper(II) halides form complexes of the type CuX₂L₂(L is 2,3-diphenyl- and 2-methyl-quinoxaline) and CuX₂L (L is 2,3-dimethylquinoxaline) with substituted quinoxaline. The 2,3-diphenylquinoxaline complexes appear to be monomeric whereas the others are polymeric. The 2-methylquinoxaline complexes have halide bridges and the 2,3-dimethyquinoxaline complexes are square-planar with organic ligand bridges. These structures are deduced from reflectance and far-infrared spectra and an examination of molecular models. Some copper(II) nitrate complexes of these ligands are described.