title: Synthesis and characterization of Co(II), Ni(II), Cu(II) and Zn(II) complexes of tridentate Schiff base derived from vanillin and DL-alpha-aminobutyric acid.
abstract: Co(II), Ni(II), Cu(II) and Zn(II) complexes of the Schiff base derived from vanillin and dl-alpha-aminobutyric acid were synthesized and characterized by elemental analysis, IR, electronic spectra, conductance measurements, magnetic measurements, powder XRD and biological activity. The analytical data show the composition of the metal complex to be [ML(H2O)], where L is the Schiff base ligand. The conductance data indicate that all the complexes are non-electrolytes. IR results demonstrate the tridentate binding of the Schiff base ligand involving azomethine nitrogen, phenolic oxygen and carboxylato oxygen atoms. The IR data also indicate the coordination of a water molecule with the metal ion in the complex. The electronic spectral measurements show that Co(II) and Ni(II) complexes have tetrahedral geometry, while Cu(II) complex has square planar geometry. The powder XRD studies indicate that Co(II) and Cu(II) complexes are amorphous, whereas Ni(II) and Zn(II) complexes are crystalline in nature. Magnetic measurements show that Co(II), Ni(II) and Cu(II) complexes have paramagnetic behaviour. Antibacterial results indicated that the metal complexes are more active than the ligand.
authors.affiliation: Department of Chemistry, Manonmaniam Sundaranar University, Tirunelveli 627012, India. msnairchem@rediffmail.com
authors.forename: M Sivasankaran
authors.initials: MS
authors.lastname: Nair
authors.forename: R Selwin
authors.initials: RS
authors.lastname: Joseyphus
mesh_terms: D000613:Aminobutyrates / Q000737:chemistry*; D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000494:pharmacology; D001547:Benzaldehydes / Q000737:chemistry*; D008024:Ligands; D008280:Magnetics; D019216:Metals, Heavy / Q000737:chemistry*; D050296:Microbial Viability / Q000187:drug effects; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000737:chemistry*; D012545:Schiff Bases / Q000737:chemistry; D013057:Spectrum Analysis; D014961:X-Ray Diffraction
chemical_list: D000613:Aminobutyrates; D000900:Anti-Bacterial Agents; D001547:Benzaldehydes; D008024:Ligands; D019216:Metals, Heavy; D009942:Organometallic Compounds; D012545:Schiff Bases; C100058:vanillin