Transition metal complexes with pyrazole-based ligands. XIX. Diaqua-bis(3,5-dimethyl-1 H-pyrazole-1-carboxamidine-k²N,N′) metal(II) dinitrate, with metal = Co and Ni

Abstract

Two transition metal complexes with pyrazole-based ligands were analyzed. The isostructural and isomorphous complexes, [M(C6H 10N4)2(H2O) 2](NO 3)2 (M is Co or Ni), contain transition metal in a distorted octahedral geometry, coordinated by four nitrogen atoms and two oxygen atoms. The CoII and NiII cations were found in a distorted octahedral environment, coordinated to the ligand in the equatorial plane through pyrazole ring nitrogen (N) atoms and amidinium group N atoms. It was stated that the three dimensional pattern of hydrogen bonding imparts stability to the crystal structure of the two title complexes.