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Bidentate Lewis Base Adducts of Methyltrioxidorhenium(VII): Ligand Influence on Catalytic Performance and Stability
Author(s) -
Zhou MingDong,
Jain Kavita R.,
Günyar Alev,
Baxter Paul N. W.,
Herdtweck Eberhardt,
Kühn Fritz E.
Publication year - 2009
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200900260
Subject(s) - chemistry , steric effects , denticity , bipyridine , catalysis , lewis acids and bases , ligand (biochemistry) , 2,2' bipyridine , medicinal chemistry , pyridazine , adduct , rhenium , cyclooctene , polymer chemistry , crystallography , stereochemistry , crystal structure , inorganic chemistry , organic chemistry , biochemistry , receptor
Abstract Methyltrioxidorhenium (MTO) forms 1:1 adducts of the general formula CH 3 ReO 3 · L 2 with bidentate Lewis bases (L 2 = 5,5′‐dimethyl‐2,2′‐bipyridine, 5,5′‐diamino‐2,2′‐bipyridine, 4,4′‐dibromo‐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 2 O 2 /organic 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. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)