Gilding primary amines: Formation of organotris(triphenyl-phosphineaurio) ammonium tetrafluoroborates [(AuPPh3)3NR] +BF4-; Crystal structures where R = Bu t or C6H11

Andreas Grohmann, Jürgen Riede, Hubert Schmidbaur

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

Tris(triphenylphosphineaurio)oxonium tetrafluoroborate was found to be a powerful aurating reagent for primary amines RNH2 (R = Me, Et, Prn, Pri, But, cyclohexyl, CH2Ph or Ph). Stable, colourless organotris(triphenylphosphineaurio)ammonium tetrafluoroborates are formed in high yields. The products have been characterized by analytical and spectroscopic data, including 197Au Mössbauer spectroscopy for [(AuPPh3)3NBu t]+BF4- and single-crystal X-ray analysis of this compound and that where R = cyclohexyl. The ammonium nitrogen atoms have been located at the centre of a distorted tetrahedron in both cases, with Au-N-Au angles smaller than the tetrahedral value and Au ⋯ Au contacts near 3.0 Å indicating attractive forces between the gold atoms ('aurophilicity').

Original languageEnglish
Pages (from-to)783-787
Number of pages5
JournalJournal of the Chemical Society. Dalton Transactions
Issue numberS
DOIs
StatePublished - 1991
Externally publishedYes

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