New Co (II) Complex of N'-(4-hydroxy-3-methoxybenzylidene) Isonicotinohydrazide: Synthesis, Spectral Characterisation, X-ray Structure

Abstract

The reactions of Schiff base N'-(4-hydroxy-3-methoxybenzylidene)isonicotinohydrazide (H2L) with CoCl2.6H2O provided one new mononuclear complex formulated as {[Co(H2L)2(H2O)4]·2Cl·2H2O} (1). The study aims to study and characterise the compound by elemental analysis, infrared, and ultraviolet-visible (UV-vis) spectroscopy. The structure of the complex has been resolved by Single-Crystal X-ray crystallography. The mononuclear complex 1 crystallises in the triclinic space group Pī with unit cell parameters a = 6.8412 (5) Å, b = 10.0690 (7) Å, c = 12.2548 (9) Å, with V = 825.54 (10) Å3 and Z = 1. The asymmetric unit of complex 1 contains one half of the cobalt(II) cation, one ligand molecule, three water molecules, two coordinated and one uncoordinated, and one chloride anion. The ligand binds the metal in a monodentate fashion through the pyridine nitrogen atom. The cobalt ion is hexacoordinated, and its environment is best described as a slightly distorted octahedron. Numerous hydrogen bonds between the ligand, the anion and the water molecules complete the three-dimensional network.