Cobalt(II), nickel(II), and copper(II) complexes of imidazole and thiazole

Abstract

The preparation and spectral and magnetic properties are reported for the complexes of the type Co(imidazole)₆X₂ and Ni(imidazole)₆X₂(X = Cl, Br, l, or NO₃) and Cu(imidazole)₄X₂(X = Cl or NO₃). These compounds have octahedral or distorted octahedral structures whereas the compounds Co(imidazole)₂Cl₂ and di-imidazolatocobalt(II) are tetrahedral. The “inner” complex di-imidazolatonickel(II) has a square-planar structure. The thiazole complexes Ni(thiazole)₄Cl₂, Co(thiazole)₂Cl₂, and Cu(thiazole)₂Cl₂ are described and are shown to have essentially octahedral structures.