Tetrakis(triphenylphosphine oxide)lithium di(iodo)aurate(I)

Oliver Schuster, Hubert Schmidbaur

Research output: Contribution to journalArticlepeer-review

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The title compound, [(Ph3PO)4Li]+ AuI 2-, crystallized from a reaction mixture obtained from Ph3PAuC=CPh, LiMe and MeI (molar ratio 1:1:2) in diethylether upon subsequent oxidation in air. The triclinic crystals, space group P1, are isomorphous with those of the corresponding di(bromo)cuprate(I). The gold atoms of the two independent [AuI2]- anions reside on centers of inversion and have no close interanionic contacts. The structure of the complete [(Ph3PO)4Li]+ cation does not approach any standard symmetry (e.g., S4 or D2 or D2d). Its conformation is similar to that reported for the isomorphous reference compound with the anion CuBr2-, but different from that in the bromide · acetonitrile, Li-phthalocyaninate or iodide · triphenylphosphine oxide salts, suggesting that the relative orientation of the four Ph3PO molecules at the Li+ center is flexible and co-determined by the packing in the crystals. Even the O4Li core units are affected by the variations in the mode of attachment of the Ph 3PO ligands, and their distortions are significant as shown by the ranges of Li-O distances and O-Li-O angles, which are small in the title compound, but spread from 1.886(5) to 1.953(9) Å and from 105.1(4) to 111.8(4)°, respectively, when taking into account all known salts with the [(Ph3PO)4Li]+ cation.

Original languageEnglish
Pages (from-to)956-960
Number of pages5
JournalZeitschrift fur Naturforschung - Section B Journal of Chemical Sciences
Issue number8
StatePublished - Aug 2006
Externally publishedYes


  • Conformation
  • Di(iodo)aurate(I) Anion
  • Lithium Coordination
  • Triphenylphosphine Oxide Ligand


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