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In the preparation of dichlorodicarbonylruthenium(~~) by the interaction of a mixture of formic acid and hydrochloric acid on ruthenium trichloride, it was observed1 that the solution turned from its initial red colour to bright green before finally becoming yellow or orange. The dicarbonyl complex was isolated from the orange solution1 and we now report the isolation of the intermediate compound, dichloroaquocarbonylruthenium(~~), from the green solution. In the course of an elegant kinetic study of this system, Halpern and Kemp2 isolated the anion [RuCO(H20)C14]2-, which is derived from our new aquocarbonyl halide, simply by addition of ammonium chloride to the green solution; and they suggested that dichloroaquocarbonylruthenium(~~) was an intermediate in the formation of the dicarbonyl compound.

Carbonyl halides of the Group VIII transition metals. III. Dichloroaquocarbonylruthenium(II)