Abstract
Abstract Several attempts to grow crystals of the [(η2-dppe)(η5-C5Me5)Fe–C≡C–1,4-(C6H4)NMe2][PF6] radical cation (1+PF6–) resulted in the isolation of crystals of the known iron(II) [(η2-dppe)(η5-C5Me5)FeCO][PF6] carbonyl adduct (2+PF6–). We report here the solid-state structures of two polymorphs of this unexpected product, as well as the solid-state structure of a tetrafluoroborate analogue of 2+ for comparison purposes. Our investigations lead to a mechanistic proposal rationalising its formation from 1+PF6–. In this respect, this work reveals one possible ‘decomposition’ pathway undergone by electron-rich functional arylacetylide radical cations bearing electron-donating groups, when exposed to air. To cite this article: F. Paul et al., C. R. Chimie 8 (2005).
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