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The reaction of anhydrous AuCl3 with CO in thionyl chloride gives [Au(CO)Cl] in substantially quantitative yields. The reaction takes place via the intermediate formation of a soluble carbonyl species which has been characterised spectroscopically and is believed to be a mixed-valence carbonyl complex of formula [Au2(CO)Cl4]. Under nitrogen or argon, AuCl3 and [Au(CO)Cl] give an insoluble microcrystalline substance of analytical formula AuCl2, which further reacts with CO to yield [Au(CO)Cl].
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Dell’Amico et al. (1976) studied this question.
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