SYNTHESIS AND NMR STUDY OF HYDROXYQUINOXALINE CARBOXALIDINE AMINO METHYL PHENOL COBALT (II) METAL COMPLEX

Transition metal complex of Schiff base formed by the condensation of quinoxaline-2-carboxaldehyde with 2- aminophenol or were synthesized and characterized by NMR spectroscopy. The phenolic OH and NH signals which are found at 12.85 and 11.52 ppm in the spectrum of the ligand are not seen in the spectrum of the Co (II) complex indicating the enolisation of the Schiff base in Co (II) complex and participation of the phenolic OH group in chelation with proton displacement Keywords: Condensation, carboxaldehyde, 2-aminophenol, Schiff base, NMR spectra