Gold -I Compounds

Goldoiydul, n. aurous oxide, gold(I) oxide, -verbindung, /. aurous compoimd, gold(I) compound. 

Though matrix-isolated gold(O) species Au(CO) and Au(CO)2 are very unstable, the gold(I) compound Au(CO)Cl has long been known (section 4.10.5). Au(CO)Br is unstable but salts of [Au(CO)2]+ of varying stability have been made [Au(CO)2](Sb2Fn) is stable to 130°C [164]. 

An extensive chemistry is developing of dinuclear gold(III) complexes with phosphorus ylid ligands (Figure 4.41). As mentioned in section 4.19, gold(I) compounds can undergo one- or two-electron oxidative additions,... 

King, C., Wang, J.-C., Khan, M.N.l. and Fackler, J.P. Jr (1989) Luminescence and metal-metal interactions in binudear Gold(I) compounds. Inorganic Chemistry, 28, 2145-2149. 

Burini, A., Mohamed, A. and Fackler, J.P. (2003) Cyclic trrnudear Gold(I) compounds synthesis, structures and supramolecular add-base m-stacks. Comments on Inorganic Chemistry,... 

Olmstead, M.M., Jiang, F., Attar, S. and Balch, A.L. (2001) Alteration of the aurophilic interactions in trimeric Gold(I) compounds through charge transfer, behavior of solvoluminescent Au3(MeN=COMe)3 in the presence of electron acceptors. Journal of the American Chemical Society, 123, 3260. 

Besides this, the remarkable properties of gold(I) compounds, which often give rise to aurophilic interactions and/or to luminescence, are of interest when these properties are transported into the liquid crystal field. Although there is much still to be studied, it is already clear that luminescence can survive in the condensed but mobile state of a mesophase, and even in the isotropic liquid state of a molten gold compound. It also seems that aurophilicity can contribute in some cases to the formation of mesophases. 

Gold(I) complexes of the type [AuCl(PPh3)ra] (n= 1, 2) or [Au(N03)(PPh3)] show an excellent performance towards oxidative addition carbonylation or aromatic amines to form corresponding carbamates, and also towards the carbonilation of aliphatic amines to produce either alkylureas or formamides.2552,2553 Cationic gold(I) compounds of the type [AuL]+ where L = phosphine, phosphite, or arsine are excellent catalysts for the addition of alcohols to alkynes.2554... 

Donor-free gold(i) alkynyls play an important role as precursors in the synthesis of related complexes. The compounds are generally prepared from the alkyne, a gold(i) compound with ligands L, which are readily displaced, and a base (Equations (10) and (11)). 

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