Synthesis and characterization of mononuclear complexes containing 3-acetylamino-1,2,4-triazole (aat). X-ray structure of [Co(aat)2(H2O)2]Br2

Abstract The spectroscopic characteristics of the isostructural compounds [M(aat) 2 (H 2 O) 2 ]X 2 (aat = 3-acetylamino-1,2,4-triazole; M = Co, Cu, X = Br, CI; M = Ni, X = Cl) are described. The structure of [Co(aat) 2 (H 2 O) 2 ]Br 2 has been determined by X-ray diffraction methods. Crystals are monoclinic, space group P 2 1 / a with a = 9.686(3), b = 14.433(4), c = 6.169(2) A, β = 92.84(2)° and Z = 2. The structure was refined to final R and R ′ values of 0.033 and 0.039 for 1066 observed reflections. In the mononuclear cationic complex, having an imposed crystallographic C i symmetry, the cobalt atom is surrounded in a slightly distorted octahedral arrangement by two axial water molecule…