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Salt of the (rare) earth: The reactions of ytterbium(II) iodide with alkali metal salts of the [CpRu(CO)2] and [Cp2Re] anions afford molecular compounds that have two unsupported YbTM bonds (TM=transition metal; see scheme). Electron localisability indicator calculations were performed and revealed highly polar metal–metal bonds.
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Döring et al. (2010) studied this question.
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