Reactivity of nido-[2-{Fe(η-C5H5)}B5H10] with some transition-metal hydride complexes

Abstract

The reaction of nido-[2-{Fe(η-C₅H₅)}B₅H₁₀] with [Mo(PMe₂Ph)₄H₄] gave capped-closo-[1-{Fe(η-C₅H₅)}-2-{Mo(PMe₂Ph)₃H}B₅H₇] which has been characterised by X-ray crystallography as well as by ¹¹B and ¹H NMR spectroseopy. The structure determination [monoclinic, space group P2₁/c, a= 15.586(5), b= 11.523(4), c= 19.186(4)Å, β= 106.23(2)°] reveals a capped-closo geometry with one Fe–Mo–B face being capped by a boron atom and the other having a triply bridging hydrogen atom. The isostructural tungsten compound capped-closo-[1-{Fe(η-C₅H₅)}-2-{W(PMe₃)₃H}B₅H₇] was similarly prepared from [W(PMe₃)₃H₆] and nido-[2-{Fe(η-C₅H₅)}B₅H₁₀]. Reaction between [Re(PMe₃)₅H] and nido-[2-{Fe(η-C₅H₅)}B₅H₁₀] gave a mixture of nido-[2-{Re(PMe₃)₃}B₅H₁₀] and the salt [Re(PMe₃)₅H₂]⁺[nido-2-{Fe(η-C₅H₅)}B₅H₉]^–, a product of an acid–base reaction.