Tris[(triphenylphosphine)gold(I)]oxonium dihydrogentrifluoride as the product of an attempted preparation of [(triphenylphosphine)gold(I)] fluoride

Trevor Mathieson, Annette Schier, Hubert Schmidbaur

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The reaction of equivalent quantities of (triphenylphosphine)gold chloride and silver fluoride in CH2Cl2MeOH gives tris[(triphenylphosphine)gold(I)]oxonium dihydrogentrifluoride in good yield. This product is formed through the action of water in the reaction medium. Crystals of {[(Ph3P)Au]3O}-[H2F 3]- 1.5 CH2Cl2 (monoclinic, space group P21/c, Z = 4) contain the cations as hexanuclear dimers with short intra- and intermolecular Au-Au contacts. The structural details are similar to those of related salts with different anions. The [H2F3]- anion is V-shaped with one symmetrical and one unsymmetrical F-H-F hydrogen bond and is best described as an addition compound of an HF molecule and a [F-H-F]- anion. The results indicate a high affinity of H2O/OH- for (phosphine)gold fluorides and - by the same token -prove that tri(gold)oxonium cations are stable to anhydrous HF and F- anions. By contrast, hydrochloric acid is known to degrade {[(R3P)Au]3O}+ affording (R3P)AuCl and water.

Original languageEnglish
Pages (from-to)1000-1004
Number of pages5
JournalZeitschrift fur Naturforschung - Section B Journal of Chemical Sciences
Issue number11
StatePublished - Nov 2000
Externally publishedYes


  • Dihydrogentrifluoride
  • Gold fluoride
  • Trigoldoxonium salts


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