Polymer Anchored Copper (II) Complex Supported  by –ONNO– Schiff Base: Efficient Catalysts for  Oxidation of Phenol

Alekha Kumar Sutar; Ysobanta Das; Prasanta Rath; Tungabidya Maharana

Volume : III, Issue : XI, November - 2013

Polymer Anchored Copper (II) Complex Supported by –ONNO– Schiff Base: Efficient Catalysts for Oxidation of Phenol

Alekha Kumar Sutar, Ysobanta Das, Prasanta Rath, Tungabidya Maharana

Abstract :

The free and polymer anchored copper ion complexes [HMBdMBn–Cu and P– HMBdMBn–Cu], supported by –ONNO–tetradentate Schiff–base ligand are prepared by the reactions of metal solution with one molar equivalent of unsupported HMBdMBn (N, N–bis (2–hydroxy–3–methylbenzaldehyde) 4–Methylbenzene–1,2–diamine) or polymer supported Schiff–base ligands in methanol. The efficiency of complexation of copper ion on the polymer anchored HMBdMBn Schiff base was more than unsupported one. The structural study reveal that copper(II) ion complex of HMBdMBn Schiff base is square planar geometry. Complexation of copper ion increased the thermal stability of HMBdMBn Schiff base. The catalytic activities of copper complexes toward the oxidation of phenol are investigated in the presence of hydrogen peroxide. Experimental results indicate that the reactivity of P–HMBdMBn–Cu is dramatically affected by the polymer support over HMBdMBn–Cu. The rate of phenol conversion was high (1.57 x 10–6 mole dm–3 s–1) in the presence of polymer–supported HMBdMBn Schiff base complexes of copper and low in the presence of unsupported analogue. The TON for polymer supported copper catalyst was found to be 10.64 g mol–1Cu hr–1.