Ferrocene‐Based Phosphenium Ion with Intramolecular Phosphine Coordination

Abstract

AbstractA bis(ferrocenyl)phosphenium ion with intramolecular phosphine‐coordination, incorporated within [2]ferrocenophane framework, was synthesized as an air‐stable compound. Although it can be thought as a phosphino‐phosphonium derivative, considering the potential rotation of the cyclopentadienyl group of the ferrocene moiety, the isolated compound should be a masked phosphenium ion with intramolecular phosphine coordination. The redox behavior of the isolated phosphine‐coordinated phosphenium ion has been revealed by CV measurements and the theoretical calculations, suggesting its oxidation at the ferrocenyl moieties and reduction at the phosphorus center consecutively giving the corresponding phosphinyl radical and phosphide ion.