STRUCTURAL CHARACTERIZATION OF DICYANAMIDE COMPLEXES OF COPPER(II), NICKEL(II), AND COBALT(II) WITH AMINOPYRIDINES

New dicyanamide complexes of the type M[N(CN)2]2L2 (M = Cu or Ni; L = 2-, 3-, 4-aminopyridine, 2-amino-5-nitropyridine) and Co[N(CN)2]2 (2-amino-5-nitropyridine)2 were prepared and studied by spectroscopic methods as well as by room-temperature magnetic moments. The results show that the Cu(II) complexes have elongated pseudooctahedral structures while the Ni(II) and Co(II) complexes are octahedral. In most cases the N(CN)2 groups are in bridging function and through their cyanide nitrogens, or - more rarely - amide and cyanide nitrogens connect the basic structure units into polymeric conglomerates. In the Cu(II) systems exchange coupling is seen from the mu(eff) value or ESR spectrum.