Structural characterization of metal(II) thiocyanato complexes derived from bis(2-(H-pyrazol-1-yl)ethyl)amine

Abstract

Reactions of a methanolic solution containing M(NO3)2·nH2O and bis(2-(H-pyrazol-1-yl)ethyl)amine (bepza) with NH4NCS afforded two series of complexes: the mononuclear dithiocyanato [M(bepza)(NCS)2] (1: M=Mn2+, 2: M=Zn2+, 3: M=Cu2+, 5: M=Ni2+) and the dinuclear bridged-thiocyano [M2(bepza)2(μ1,3-NCS)2(NCS)2] (6: M=Cd2+, 7: M=Co2+). The compounds which proved to be non-electrolytes were characterized by IR and UV–Vis spectroscopy and the molecular structures of the compounds 1–3, 6 and 7 were determined by single-crystal X-ray crystallography. In the former series, the five-coordinate distorted square pyramidal or trigonal bipyramidal geometry was achieved by the three N-donors of the ligand bepza and two N atoms of the terminal thiocyanato ligands, whereas in the dinuclear series, distorted octahedral geometry around each metal ion was achieved via the three N-donors of bepza, one N atom of a terminal thiocyanato ligand and a doubly bridged μ1,3-NCS.