title: Synthesis, spectrochemical characterisation and catalytic activity of transition metal complexes derived from Schiff base modified chitosan.
abstract: Three novel quadridentate Schiff base complexes, [Cu(OIAC)Cl(2)], [Co(OIAC)Cl(2)] and [Ni(OIAC)Cl(2)] [OIAC, a Schiff base ligand: (([2-oxo-1H-indol-3-ylidene]amino)chitosan)] have been synthesized. The molecular structure of the complexes has been characterised by elemental analyses, magnetic measurements, molar conductance studies, vibrational (FT-IR), electronic (UV-Vis) and (1)H NMR spectroscopic techniques. Thermal properties of the complexes have been investigated with TG-DTG analyses. The surface morphological difference of ligand and the complexes has been explored with scanning electron microscopy. The crystallinity of the compounds was analysed by powder X-ray diffraction technique and it was found to be less for the Schiff base (OIAC) and the complexes as compared to the chitosan. The catalytic activities of the complexes have been studied in the oxidation of cyclohexane, using environmental friendly oxidant, hydrogen peroxide. Complex with rough surface has shown higher catalytic activity compared to the other complexes.
authors.affiliation: Centre for Scientific and Applied Research, PSN College of Engineering and Technology, Tirunelveli 627 152, Tamilnadu, India.
authors.forename: R
authors.initials: R
authors.lastname: Antony
authors.forename: S
authors.initials: S
authors.lastname: Theodore David
authors.forename: K
authors.initials: K
authors.lastname: Saravanan
authors.forename: K
authors.initials: K
authors.lastname: Karuppasamy
authors.forename: S
authors.initials: S
authors.lastname: Balakumar
mesh_terms: D002384:Catalysis; D048271:Chitosan / Q000138:chemical synthesis / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry*; D003300:Copper / Q000737:chemistry; D003510:Cyclohexanes / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D009532:Nickel / Q000737:chemistry; D010084:Oxidation-Reduction; D012545:Schiff Bases / Q000138:chemical synthesis / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D028561:Transition Elements / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D056831:Coordination Complexes; D003510:Cyclohexanes; D012545:Schiff Bases; D028561:Transition Elements; D003035:Cobalt; C506365:Cyclohexane; D003300:Copper; D009532:Nickel; D048271:Chitosan