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'diastereomers' in keywords Facet   Publication Year 1997  [X]
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1Author    Angela Bayler, Andreas Bauer, Hubert SchmidbaurRequires cookie*
 Title    Chiral Phosphine Ligands in the Structural Chemistry of Gold  
 Abstract    The reaction of chloro(dimethylsulfide)gold(I) with (2-hydroxybutyl)diphenylphosphine (L) (racemic mixture) in dichloromethane affords high yields of the racemic chiral complex (L)AuCl. Metathesis reactions with KBr or KI, respectively, in a two-phase solvent mix­ ture (CH2CI2/H2O) lead to a conversion into the corresponding bromide and iodide complexes (L)AuBr and (L)AuI. Treatment of silver chloride with the ligand L in acetonitrile yields the analogous 1:1 adduct (L)AgCl. The compounds have been characterized by their analytical and spectroscopic data, and the structures of (L)AuCl and (L)AuBr have been determined by single-crystal X-ray diffraction. The compounds build isomorphous crystal lattices (monoclinic, P2i/c) in which pairs of enantiomers (R-and S-configuration of L) are aggregated by two long hydrogen bonds between the hydroxyl group of the ligand and the halogen substituent of the neighbouring molecule. Cationic, linear two-coordinate 1:2 complexes (L)2Au+ X-(X = BF4, CIO4, SO3CF3) and (L)2Ag+ X-(X = BF4) are obtained in good yields by reaction of L with Me2SAuCl and AgX (molar ratio 2:1:1) or with AgBF4 (molar ratio 2:1), respectively. 31P NMR studies at variable temperature show an equilibrium between all possible stereoisomers (RR, SS, RS, SR) in solution with rapid ligand exchange at ambient temperatures. 
  Reference    Z. Naturforsch. 52b, 1477—1483 (1997); received October 14 1997 
  Published    1997 
  Keywords    Gold Complexes, Phosphane Complexes, Chiral Phosphanes, Crystal Structure, Diastereomers 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-1477.pdf 
 Identifier    ZNB-1997-52b-1477 
 Volume    52