Homonuclear gold cluster compounds

Augite, Mossbauer spectrum of, 6 474 Au(PRj) fragment, addition to homonuclear gold cluster compounds, 39 329-332 Auranofin, 36 21 cytotoxicity, 36 22, 34 Auro-bis(thiosulfate), 36 18-19 Aurosomes, gold in, 36 21-22 Aurothioglucose, 36 18-19 Aurothiomalate, 36 18-21... 

Herein we describe the synthesis and characterization of small-size homonuclear gold cluster compounds with a nuclearity ranging from 3 to 39 gold atoms. These types of dusters are usually characterized through definitive structural techniques such as single-crystal X-ray diffraction, enabling in-depth study of the structural arrangements found in the solid state. 

Single-crystal X-ray crystallography remains the only definitive technique for the structural characterization of heteronuclear gold cluster compounds, although other techniques, in particular Mossbauer, NMR, IR, and fast atom bombardment mass spectroscopies (FABMS), have yielded valuable information, especially concerning the nature of these species in solution. Electron spectroscopy, which has proved to be of great value in the identification of homonuclear gold cluster compounds (210) has received little attention by workers in this area,... 

Au4(PPh3)4()U-SnCl3)2], which has been prepared in these laboratories (195), is isoelectronic and isostructural with the homonuclear gold cluster compound [Au4(PPh3)4(/w-I)2] (269) and has the structure illustrated in Fig. 22b. Both of these clusters exhibit longer Au-Au bonds than are found in the gold-osmium cluster. 

The type of homonuclear gold cluster compound formed by the photolysis of R3PAUN3 is influenced by the steric demand of the ligand bound to the gold atom. If Ph3PAuN3 is used for the photolytic reaction in THF then smaller clusters like [(Ph3PAu)s] + are obtained (Eq. 1). 

Bonding in the homonuclear and heteronudear gold cluster compounds... 

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