COPPER(II) AND ZINC(lI) COMPLEXES OF REDUCED SCHIFF BASES AND THEIR CATALYTIC ACTIVITIES

Abstract

The present dissertation describes the synthesis of copper and zinc metal complexes with reduced Schiff base ligands and their characterization by various physicochemical techniques. Styrene catalytic oxidation reaction has been carried out using these complexes as catalyst and suitable reaction conditions have been obtained for the maximum oxidation of styrene. The reaction products have been analyzed by gas chromatograph (GC). For convenience the work presented in this dissertation has been divided in the following chapters. First Chapter is the introduction and literature survey, About various copper and zinc complexes with Schiff base and reduced Schiff base ligands and their catalytic activity which are related to present work have been reported. Second Chapter describes the synthesis of reduced Schiff base ligands viz, H2SGly (N(2-hydroxybenzyl)-Glycine) (A), H2SLue (N-(2-hydroxybenzyl)-Luesine) (B), H2SPhe (N-(2-hydroxybenzyl)-phenylalanine) (C) and Third Chapter is devoted on the synthesis of copper(II) complexes viz, [Cu2(Sgly)2].H20 (D), [Cu2(Slue)2].H20 (E) and [Cu2(Sphe)2].H20 (F). Characterization of these ligands and complexes are achieved by various physicochemical techniques, IR, UV, TGA and VSM. The copper complexes (D, E, F) are found to be active catalysts for the oxidation. of styrene using H202 as an oxidant. Under optimized reaction conditions we have found that the order of percentage conversion of styrene oxidation with various (D, E, F) catalysts is F (95%) > D (82%) > E (79%). Chapter four deals with zinc complexes with above mentioned reduced Schiff base ligands (A, B, C). This chapter describes synthesis and characterizations of zinc complexes viz, Zn2(Sgly)2].H20 (G), Zn2(Slue)2].H20 (H), Zn2(Sphe)2].H20 (M). We have also studied the catalytic activity of zinc complexes on styrene oxidation under same VI optimized conditions which were used for copper complexes (D, E, F). It was found that zinc complexes (G, H, I) are not show good catalytic active compared to copper complexes (D, E, F). Finally, it is concluded that copper complexes (D, E, F) are good catalyst than zinc complexes (G, H, I) for styrene oxidation.