H2Ru6(CO)18,[HRu6(CO)18]–, and [Ru6(CO)18]2–: a simple high yield route to these clusters and the X-ray structure of [Ph3MeP]2[Ru6(CO)18]

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Abstract
Reaction of Ru3(CO)12 with base gives [HRu3(CO)11]– or [Ru6(CO)18]2– depending upon reaction conditions, and acidification of either produces [HRu6(CO)18]– then H2Ru6(CO)18; X-ray analysis has shown the [Ru6(CO)18]2– dianion to possess octahedral metal geometry with bridging as well as terminal carbonyl ligands.