First structural characterisation of penta- and hexa-phosphorus analogues of ferrocene. Synthesis, crystal and molecular structure of the air-stable, sublimable iron sandwich compounds [Fe(η5-C2R2P3)2], and [Fe(η5-C3R3P2)(η5-C2R2P3)](R = But)

Abstract

The first structurally characterised penta- and hexa-phosphorus analogues of ferrocene, bis-(η^5–2,5-di-t-butyl-1,3,4-triphosphacyclopentadienyl)iron and (η⁵-2,4,5-tri-t-butyl-1,3-diphosphacyclopentadienyl)-(η⁵-2,5-di-t-butyl-1,3,4-triphosphacyclopentadienyl)iron, are described.