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Oxo-bridged bis oxo-vanadium(V) complexes with tridentate Schiff base ligands (VOL)2O (L = SAE, SAMP, SAP): Synthesis, structure and epoxidation catalysis under solvent-free conditions |
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| Authors: | Cindy Cordelle Dominique Agustin Jean-Claude Daran |
| Institution: | a CNRS, LCC (Laboratoire de Chimie de Coordination), Université de Toulouse, UPS, INPT, 205, route de Narbonne, F-31077 Toulouse, France b Université de Toulouse, Institut Universitaire de Technologie Paul Sabatier, Département de Chimie, Av. Georges Pompidou, BP 20258, F-81104 Castres Cedex, France c Institut Universitaire de France, 103, bd Saint-Michel, 75005 Paris, France |
| Abstract: | The dinuclear V(V) complexes (VOL)2O (L = SAE (1), SAMP (2), SAP (3)) have been synthesized from VO(acac)2 and the corresponding tridentate ligands LH2 in methanol under reflux conditions and subsequent air oxidation in organic solvent. They have been characterized by IR and NMR spectroscopy, by thermogravimetric analysis, and by single crystal X-ray diffraction for 1 and 2. DFT calculations were carried out for a better understanding of the vibrational pattern, principally the V-O related vibrations. Complex VO(SAP)]2O (3) catalyzes the epoxidation of cyclooctene by TBHP in water in the absence of any added solvent with good selectivity. |
| Keywords: | Vanadium Vanadyl complexes Schiff base ligands Epoxidation Homogeneous catalysis |
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