Extended Sandwich Molecules Displaying Direct Metal–Metal Bonds

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  • Subrat Kumar Barik
    Department of Chemistry Indian Institute of Technology Madras 600036 Chennai India
  • Monojit Ghosal Chowdhury
    Department of Chemistry Indian Institute of Technology Madras 600036 Chennai India
  • Susmita De
    Department of Chemistry National Institute of Technology Calicut 673601 Kozhikhode India
  • Pattiyil Parameswaran
    Department of Chemistry National Institute of Technology Calicut 673601 Kozhikhode India
  • Sundargopal Ghosh
    Department of Chemistry Indian Institute of Technology Madras 600036 Chennai India

抄録

<jats:p>Treatment of [Cp*IrCl<jats:sub>2</jats:sub>]<jats:sub>2</jats:sub> (Cp* = pentamethylcyclopentadienyl) with Li[BH<jats:sub>3</jats:sub>(SePh)] at room temperature led to the isolation of a dimetala analogue of hexaborane(10), <jats:italic>nido</jats:italic>‐[(Cp*Ir)(µ‐SePh)<jats:sub>2</jats:sub>Ir{(Cp*Ir)SePh}B<jats:sub>4</jats:sub>H<jats:sub>8</jats:sub>] (<jats:bold>1</jats:bold>). Solid‐state X‐ray structure analysis of <jats:bold>1</jats:bold> showed an extended sandwich molecule with two iridium atoms between Cp* and a [B<jats:sub>4</jats:sub>Ir] ring. Further, in an effort to synthesize the Rh analogue of <jats:bold>1</jats:bold> under similar reaction conditions, we isolated <jats:italic>arachno</jats:italic>‐[{(Cp*Rh)(µ‐SePh)<jats:sub>3</jats:sub>}Rh(µ‐SePh)B<jats:sub>3</jats:sub>H<jats:sub>6</jats:sub>] (<jats:bold>2</jats:bold>), a rhodium analogue of tetraboarane(10) in which the {RhB<jats:sub>3</jats:sub>} unit shows geometric equivalence with a metal π‐allyl {MC<jats:sub>3</jats:sub>} species. Ir complex <jats:bold>1</jats:bold>, having an Ir–Ir bond, can be considered similar to the dizinc sandwich complex [Cp*Zn‐ZnCp*] in terms of the valence electron count at the metal centers.</jats:p>

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