Synthesis and crystal structure of a coordinatively unsaturated organomercury iridium complex (PCP)Ir(HgPh)Cl (PCP = η3-2,6- (tBu2PCH2)2C6H 3)

Xiawei Zhang, Thomas J. Emge, Alan S. Goldman

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The title compound (PCP)Ir(HgPh)Cl (1), (PCP = η3-2,6-( tBu2PCH2)2C6H 3), is obtained by the reaction of (PCP)IrHCl and Ph2Hg in toluene solution. Purple crystals of 1 were grown by slow evaporation of benzene solution of 1 and have been studied by X-ray crystallography. The space group is P21/n, a = 13.9384(8) Å, b = 15.1095(8) Å, c = 15.8148(9) Å, β = 111.005(1)°, V = 3109.3(3) Å 3, Z = 4. The geometry at the iridium center is quasi-square pyramidal with Hg at the apical position; the Cl-Ir-C(PCP) angle is 175.87(8)°. The Ir-Hg-C(Ph) angle is 175.90(9)°. The Hg-Ir bond is unusually short: 2.5251(2) Å. This short distance is likely attributable to the absence of a ligand trans to the phenylmercury group. The resulting strong metal-mercury bond may explain the unusual stability of the complex and the failure to eliminate mercury as is commonly observed with organomercury-transition-metal complexes.

Original languageEnglish
Pages (from-to)613-617
Number of pages5
JournalJournal of Chemical Crystallography
Issue number8
Publication statusPublished - Aug 1 2003



  • Crystal structure
  • Ir-Hg bond
  • Organomercury complex
  • Pincer ligand

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics

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