Aurated ions

The partially aurated ion 98 has been obtained by Sladek and Schmidbaur,261 who reacted (Ph3PAu)30 1 BI, with 2-methylpropane-2-thiol. Cation 98 is dimeric in the crystal with very similar Au—Au distances within and between the monomeric units indicating significant aurophilic interaction between cations. 

Figure 1. TEM micrographs of regular mono micellar films (a) loaded with (a) LiAuCU, and (b) where the aurate ions were converted to a single Au cluster per micelle prior to film casting. The scheme illustrates that in both cases a single gold particle remains at the place of the micelle.

Preparation and properties of stable salts containing mono- or bis-(pentafluorophenyl)aurate(I) and mono-, tris-, or tetrakis-(pentafluorophenyl) aurate(III) ions. Journal of the Chemical Society, Chemical Communications, (10), 353-354. 

Although the structure determination of an alkali fluoro-aurate would have been more satisfactory for the description of the AuFfi" ion, single crystals of MAuFg (M = Cs, Rb, K, etc.) have not yet been obtained. Nevertheless, with allowance for the perturbing influence of the unsymmetrical cation, an adequate description of AuFe" has been provided by the structure of XciFu AuFe. ... 

Alkynylgold(I) hahde anion complexes have been prepared from suitable gold acetylide precursors by addition of hahde ion, as illustrated in equation 1770, or reacting a bis(acetyhde)aurate(I) with a dihalogenoaurate(I) (equation 18)76. 

Sodium hydroxide solution reddish-brown precipitate of gold(III) hydroxide, Au(OH)3, from concentrated solutions. The precipitate has amphoteric properties it dissolves in excess alkaU forming tetrahydroxo-aurate(III), [Au(OH)4] , ion. 

AUCI4 ions are bound as counterions to the polar core of the micelles. The aurate loaded micelles are formed in equilibrium and the amount of gold per micelle varies only in narrow limits (18,19). Typically up to one or half an equivalent of AuClJ per 2VP or EO unit, respectively, can be taken up by the micellar solution. 

The auration of the metallated cyclopentadienyl ligands in [Fe(C5H4Li>2] is a related example of ion exchange at a site remote from the metal center,42 Scheme 5.4 ... 

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