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Chromophoric Lewis Base Adducts of Methyltrioxorhenium: Synthesis, Catalysis and Photochemistry
Author(s) -
Hauser Simone A.,
Korinth Valentina,
Herdtweck Eberhardt,
Cokoja Mirza,
Herrmann Wolfgang A.,
Kühn Fritz E.
Publication year - 2010
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.201000348
Subject(s) - chemistry , adduct , catalysis , steric effects , photochemistry , pyridine , ultraviolet visible spectroscopy , lewis acids and bases , catalytic cycle , spectroscopy , dichloromethane , nuclear magnetic resonance spectroscopy , medicinal chemistry , organic chemistry , physics , quantum mechanics , solvent
Abstract A series of chromophoric Lewis base adducts of methyltrioxorhenium (MTO) was examined. The ligands were pyridine derivatives with different size of the aromatic system and variable substituents, thus providing a variation of electronic and steric parameters. The complexes were fully characterised (UV/Vis, IR and NMR spectroscopy, single‐crystal X‐ray diffraction and elemental analysis) and their stability constants in dichloromethane were determined by means of UV/Vis spectroscopy. Moreover, this report presents a study of the influence of these N‐donor ligands coordinated to MTO on the catalytic activity of epoxidation of 1‐octene. Each compound was tested twice; in a catalytic reaction under exclusion of light and in daylight. No significant differences in catalytic performance were found. The behaviour of the complexes under irradiation with UV light was investigated by means of 17 O‐NMR and UV/Vis spectroscopy. The herein exposed experiments aimed for probing potential beneficial effects of chromophoric N‐donor ligands in MTO adducts, as they might activate the catalytic system by providing additional energy for weakening bonds that have to be broken during the catalytic cycle.