An attractive route to mixed‐valent metal oxideshas been developed from the observation that on slow heating1completely loses its acetonitrile ligands at temperatures below 350 °C and is transformed into an oxide containing MoVIand Re in two oxidation states. Salt1is prepared surprisingly simply according to Equation (a) and shows unexpected electron‐acceptor properties, which makes it a potential source of a naked Re ion. The structural parameters of the cation of1point to a ReRe triple bond, although no strong α or π donors stabilize the system. equation image
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Bernstein et al. (1992) studied this question.
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