New Co (II) Complex of N'-(4-hydroxy-3-methoxybenzylidene) Isonicotinohydrazide: Synthesis, Spectral Characterisation, X-ray Structure
Adama Sy *
LSAO-MED, Gaston Berger University, Saint-Louis, Senegal and LCCO Department of Chemistry, University Cheikh Anta DIOP, Dakar, Sénégal.
Andrea Daolio
Department of Chemical Sciences, Life Science and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy.
Dame Gadiaga
LSAO-MED, Gaston Berger University, Saint-Louis, Senegal and LCCO Department of Chemistry, University Cheikh Anta DIOP, Dakar, Sénégal.
Paolo Pio Mazzeo
Department of Chemical Sciences, Life Science and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy and Biopharmanet-TEC, University of Parma, Parco Area Delle Scienze 27/A,Parma 43124, Italy.
Ibrahima Elhadji Thiam
LCCO Department of Chemistry, University Cheikh Anta DIOP, Dakar, Sénégal.
Alessia Bacchi
Department of Chemical Sciences, Life Science and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy and Biopharmanet-TEC, University of Parma, Parco Area Delle Scienze 27/A,Parma 43124, Italy.
Mohamed Gaye
LCCO Department of Chemistry, University Cheikh Anta DIOP, Dakar, Sénégal.
*Author to whom correspondence should be addressed.
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.
Keywords: Synthesis, X-ray crystal structure, isonicotinohydrazide, coordination complex