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Bidentate lewis base adducts of methyltrioxidorhenium(VII): Ligand influence on catalytic performance and stability
Methyltrioxidorhenium (MTO) forms 1:1 adducts of the general formula CH3ReO3-L2 with bidentate Lewis bases (L 2 = 5,5′-dimethyl-2,2′-bipyridine, 5,5′-diamino-2,2′-bipyridine, 4,4′-dibronio-2,2′-bipyridine, 5,5′-dibromo-2,2′-bipyridine, diethyl 2,2′-bipyridine-5,5′-dicarboxylate, 1,10-phenanthroline-5,6-dione, 3,6-di(2-pyridyl)pyridazine), Due to the steric demands of the ligands, the complexes display a distorted octahedral geometry as confirmed by solid state X-ray crystallography. The rhenium center is disordered in all examined crystal structures. The complexes synthesized, are thermally stable but sensitive to light and moisture. The 2,2’bipyridine derived, complexes exhibit: good catalytic activities for cyclooctene epoxidation in a biphasic H 2O2organic solvent catalytic system using hydrogen peroxide as oxidizing agent. The functional groups on the bipyridine rings play an important: role with respect to the differences in formation, stability and activity of the complexes. Their influence depends largely on their electron donor capabilities.
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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI