The electronic absorption spectrum of [ R U ~O C I ~~] ~-in a room-temperature ionic liquid shows three discrete bands in the near4.r. region due to electronic transitions associated with the x(Ru-0-Ru) skeleton; claims of the synthesis ofhave been demonstrated to be in error (the reported products being mixtures of Cs3[Ru2BrgJ and CsBr), and the detailed structure of [Ru2Brg]3-[r(RuRu) = 0.287 nm] is reported for the first time.
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