Synthesis, Characterization And Catalytic Activity Of Iron And Copper Complexes

This thesis contains the following two parts:The functionalisation of micro-nano silica gel with iron (Ⅱ) complex and its catalysis towards the degradation of catechol. A bidentate ligand L (L=2-(ethylthiomethyl)pyridine) with "NS" donor set and its iron (Ⅱ) complex,[FeL2Cl2], were synthesised and fully characterised. Reaction of pyridin-2-ylmethanethiol with3-chloropropyltriethoxysilane gave functionalised silica gel, L-NSiG which possessed a donor-set analogous to ligand L. Loading iron (II) using both FeCl2and FeSO4to the functionalised silica gel (L-NSiG) produced two functionalised materials, Fec@L-NSiG and Fes@L-NSiG (Scheme3.2). Possible coordination chemistry of the iron(Ⅱ) on the surface of the functionalised materials and hence their catalytic performance on the catalysis of oxidative degradation of catechol by hydrogen peroxide were discussed alongside with the control complex [FeL2Cl2]. The material Fes@L-NSiG whose iron(Ⅱ) may have more labile ligand(s) compared to its analogue FeC@L-NSiG showed higher catalytic efficiency by about one-fold and slightly lower performance compared to the control complex.Synthesis and characterization of multbntate ligands possessing{N,O}-donor and their copper (Ⅱ) complexes (10、11、12and14) and iron (Ⅲ) complex (13) and catalytic performance on the catalysis of benzene selective oxidation to phenol with these coplexes. Complexes10,13and14were characterised using X-ray single crystal diffraction analysis. It was found that complex10was a phenol-bridged di-copper (Ⅱ) complex, complex14was an OH-bridged and phenol-bridged nine nuclear-copper (Ⅱ) complex and complex13was a mononuclear iron (Ⅲ) complex. All complexes were as the catalyst in benzene selective oxidation using hydrogen peroxide as oxidant and acetonitrile as solvent. Result indicated that all copper complexes have the catalytic activity of benzene hydroxylation except13.