Crystal structure and physicochemical properties of a mixed-chelated nickel complex: aquo-{o-[(2-pyridylmethylene)amino]benzamide}-[2-(2-pyridyl)-1,2,3,4-tetrahydroquinazolin-4-one]nickel(II) dinitrate tetrahydrate

Abstract

The title compound has been prepared and its spectroscopic and magnetic properties and X-ray structure have been studied. The structure was solved from diffractometer data by Patterson and Fourier methods and refined by least-squares techniques to R 6·3% for 6530 independent reflexions. Crystals are triclinic, space group P, with unit-cell dimensions: a= 15·49(1), b= 13·00(1), c= 8·99(1)Å, α= 95·3(1), β= 105·3(1), γ= 110·8(1)°, Z= 2. Co-ordination around Ni is octahedral and involves two different organic ligands and a water molecule. The o-aminobenzamide ligand is terdentate [Ni–O(1) 2·028, Ni–N 2·082, 2·067 Å] and the quinazolinone ligand is bidentate (Ni–N 2·164, 2·068 Å). Packing is determined by a hydrogen bond system and by van der Waals contacts.