[PPN]₂[Cr₂(CO)₁₀], a Salt of the Dimeric Cr^1- Carbonyl Complex Without a Coordinating Counterion

The Cr(^1-) carbonyl complex bis[bis(triphenylphosphine)iminium] decacarbonyldichromate(2-), [PPN]₂[Cr₂(CO)₁₀], (1), where [PPN]⁺ is [(Ph₃P)₂N]⁺, has been prepared by naphthalenide reduction of a Cr⁰ precursor followed by counterion metathesis to introduce a non-coordinating cation. The [Cr₂(CO)₁₀]^2- dianion in (1) is structurally similar to that in a previously characterized salt with a [K(DME)₂]⁺ counterion (DME = dimethylethane), despite the loss of the solid-state ion-pairing present in the [K(DME)₂]⁺ salt.

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