Heterotrinuclear manganese(II) and vanadium(IV) Schiff base complexes as epoxidation catalysts |
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Authors: | Sajjad Mohebbi Shokoh Bahrami Asad Shangaie |
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Affiliation: | (1) Department of Chemistry, University of Kurdistan, PO. Box 66179-416, Sanandaj, Iran |
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Abstract: | The catalytic epoxidation of styrene using urea-hydrogen peroxide and heterotrinuclear Cu(II) complexes with general formula (ML n )2Cu(acac)2, where n = 1–3 and M = VO2+ or Mn2+ is reported. Schiff base complexes ML n involving a 3,4-diaminopyridine bridge with free coordination site were used as the ligand, where (Ln)2− is [(5-x-Sal)2Py]2 and x = H, Br or NO2. The complexes were characterized by physico-chemical and spectroscopic methods. The electrochemical properties of M were modified upon trinuclear complex formation. The trinuclear complexes show high catalytic activity, with up to 86% conversion and 93% selectivity, while no catalytic properties were observed for the monomeric complexes. The catalyst could be reused with some loss of activity. |
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