title: Synthesis, spectroscopic and X-ray characterization of a copper(II) complex with the Schiff base derived from pyridoxal and aminoguanidine: NMR spectral studies of the ligand.
abstract: A copper(II) complex with the pyridoxal-aminoguanidine (PL-AG) Schiff base adduct, as an organic compound of the very potent biological activity and promising pharmacological importance in the treatment of diabetic complications, has been prepared and characterized. The X-ray structural analysis of the [CuCl2(PL-AG)] complex showed that it has a distorted pseudo-square-pyramidal (4+1) structure with the tridentate ONN Schiff base in the equatorial plane, with the Cu-O(1), Cu-N(1) and Cu-N(3) bond lengths of 1.917(2)A, 1.930(2)A and 1.984(2)A, respectively. The bond length of the equatorial Cu-Cl(1) is 2.279(1)A, while that of the apical Cu-Cl(2) is 2.792(1)A. Pyridoxal fragment is coordinated in its zwitterionic form. In addition to the X-ray structural analysis, the complex was characterized by IR spectrometric, conductometric and magnetic techniques, and the ligand itself by IR, 1H and 13C NMR spectra.
authors.affiliation: Faculty of Sciences, University of Novi Sad, Trg D. Obradovića 3, 21000 Novi Sad, Serbia.
authors.forename: Vukadin M
authors.initials: VM
authors.lastname: Leovac
authors.forename: Milan D
authors.initials: MD
authors.lastname: Joksović
authors.forename: Vladimir
authors.initials: V
authors.lastname: Divjaković
authors.forename: Ljiljana S
authors.initials: LS
authors.lastname: Jovanović
authors.forename: Zana
authors.initials: Z
authors.lastname: Saranović
authors.forename: Andrej
authors.initials: A
authors.lastname: Pevec
mesh_terms: D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray / Q000379:methods; D006146:Guanidines / Q000737:chemistry*; D008024:Ligands; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008958:Models, Molecular; D015394:Molecular Structure; D011730:Pyridoxal / Q000737:chemistry*; D012545:Schiff Bases / Q000737:chemistry*
chemical_list: D006146:Guanidines; D008024:Ligands; D012545:Schiff Bases; D011730:Pyridoxal; D003300:Copper; C004479:pimagedine