Comparative study of electronic and steric properties of bulky, electron-rich bisphosphinoethane, bis-NHC and phosphino-NHC chelating ligands in analogous rhodium(I) and iridium(I) COD and carbonyl complexes
作者： Marcel Brill , Daniela Marrwitz (née Eisenhauer) , Frank Rominger , Peter Hofmann
DOI: 10.1016/J.JORGANCHEM.2014.04.008
关键词:
摘要: Abstract The synthesis and characterization of rhodium(I) iridium(I) COD (1,5-cyclooctadiene) carbonyl complexes containing small-bite angle bulky bisphosphine (bis(di-tert-butylphosphino)ethane = dtbpe), bis-NHC (1,1′-di-tert-butyl-3,3′-methylenediimidazolin-2,2′-ylidene BisNHC) phosphino-functionalized NHC (3-tert-butyl-1-(di-tert-butylphosphinomethyl)-imidazolin-2-ylidene = NHCP) ligands is described. X-ray diffraction analysis most compounds made spectroscopic data permitted a valuable comparison the characteristic steric electronic properties these related ligand classes also “abnormally” bound form NHCP (aNHCP). While dicarbonyl indicated similar overall donating abilities for BisNHC ligands, dtbpe aNHCP were shown to be significantly less or more electron donating, respectively. These allowed evaluation different σ-donating influences moiety in phosphine within hybrid NHC–P systems.
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