Half sandwich compound

Half sandwich compounds, also known as piano stool complexes, are organometallic complexes that feature a cyclic polyhapto ligand bound to an MLn center, where L is a unidentate ligand. Thousands of such complexes are known.[1][page needed] Well-known examples include cyclobutadieneiron tricarbonyl and (C5H5)TiCl3. Commercially useful examples include (C5H5)Co(CO)2, which is used in the synthesis of substituted pyridines, and methylcyclopentadienyl manganese tricarbonyl, an antiknock agent in petrol.

  • MMT is a commercially useful antiknock compound.
    MMT is a commercially useful antiknock compound.
  • CpCo(CO)2 is a catalyst for the synthesis of pyridines.
    CpCo(CO)2 is a catalyst for the synthesis of pyridines.
  • (C4H4)Fe(CO)3.
    (C4H4)Fe(CO)3.
  • CpFe(CO)2I is an example of a piano stool complex with two different monodentate ligands.
    CpFe(CO)2I is an example of a piano stool complex with two different monodentate ligands.
  • The diruthenium of cymene is readily cleaved by ligands to give monoRu half-sandwich derivatives.
    The diruthenium of cymene is readily cleaved by ligands to give monoRu half-sandwich derivatives.
  • Cycloheptatriene molybdenum tricarbonyl
    Cycloheptatriene molybdenum tricarbonyl
  • Cp2V2(CO)5 featuring a pair of semi-bridging CO ligands.[2]
    Cp2V2(CO)5 featuring a pair of semi-bridging CO ligands.[2]
  1. ^ Elschenbroich, Christoph (2006-03-10). Organometallics. Wiley. ISBN 978-3-527-29390-2. OCLC 1004583759.
  2. ^ Huffman, J. C.; Lewis, L. N.; Caulton, K. G. (1980). "A donor semibridge? Molecular structures of dicyclopentadienyldivanadiumtetracarbonyltriphenylphosphine and dicyclopentadienyldivanadiumpentacarbonyl". Inorganic Chemistry. 19 (9): 2755–2762. doi:10.1021/ic50211a052.