STUDIES ON DINUCLEAR METAL-COMPLEXES OF MACROCYCLIC LIGANDS WITH VARYING CHELATE RING SIZE

Dinuclear Cu-(II), Ni-(II) and Co-(II) complexes of macrocyclic Schiff -base ligands of 2,6-diformyl-4-methylphenol with alpha,omega-diamines have been synthesized and characterized. The effect of chelate ring s ize and saturation of azomethine groups of these ligands on stability, structure and electrochemical properties of the metal complexes has b een investigated. Catalytic activity of the metal complexes in the oxi dation reaction of 3,5-di-tert-butylcatechol to 3,5-di-tert-butylquino ne by molecular oxygen is reported. Copyright (C) 1997 Elsevier Scienc e Ltd.