Abstract
Tridentate Schiff base ligands derived from aromatic aldehydes and benzhydrazide, and their iron complexes [Fe(L 1)(HL 1)] 1, [Fe(HL 1)Cl 2(CH 3OH)]·(CH 3OH) 2 and [Fe(HL 2)Cl 2(H 2O)] 3 have been prepared and characterized (H 2L 1 = ( E)- N′-(2-hydroxy-3-methoxybenzylidene)benzohydrazide, H 2L 2 = ( E)- N′-(5-bromo-2-hydroxybenzylidene)benzohydrazide). The crystal structure of 2 has been determined. The electrochemical properties of these complexes have been investigated by cyclic voltammetric technique in acetonitrile solutions. Electrochemical studies have revealed quasi-reversibility for these compounds. The catalytic potential of these complexes has been tested for the oxidation of cyclooctene using tert-butylhydroperoxide (TBHP) as oxidant. The effects of the molar ratio of oxidant to substrate, the temperature, the co-catalyst concentration and the solvent have been studied. Excellent selectivities have been obtained for the epoxidation of cyclohexene, cyclooctene, norbornene, cis- and trans-stilbene.
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