Oxazole complexes. Part II. Oxygen-bonded complexes of 2-methylbenzoxazole with halides of cobalt(II), nickel(II), copper(II), and zinc(II)

Abstract

The preparation is reported of some complexes of 2-methylbenzoxazole (L) with halides of cobalt(II), nickel(II), copper(II), and zinc(II). The complexes of cobalt(II) and zinc(II) are tetrahedral, of the type MX₂L₂(M = Co^II, Zn^II, X = Cl, Br, and l) containing O-bonded ligand. The nickel(II) complexes are of three stoicheiometries: (a) NiX₂L (X = Cl and Br) which are octahedral and contain both bridging halogen and bridging ligand, and Nil₂L which is tetrahedral with bridging ligand; (b) Nil₂L₂ which is tetrahedral with O-bonded ligand; and (c) NiCl₂L₃ which shows strong ferromagnetic interactions and is probably octahedral with O-bonded ligands. The copper(II) complexes prepared were of the type CuX₂L, (X = Cl and Br), CuBr₂L₂, and CuCl₂L₃; alternative structures for these complexes are discussed.