Where have all the electrons gone? The complex [Pt3Re2(CO)6(PtBu3)3] (1) containing a trigonal bipyramidal metal cluster is unsaturated by the amount of 10 valence electrons. Compound 1 reacts with hydrogen by adding three equivalents to form the hexahydrido complex 2. The metal cluster in 2 is similar to that of 1, but contains one bridging hydrido ligand on each of the RePt bonds. Pt blue, Re green.
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Adams et al. (2005) studied this question.
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