REACTIVITY OF NIDO-[2-(FE(ETA-C5H5))B5H10] WITH SOME TRANSITION-METAL HYDRIDE COMPLEXES

The reaction of nido-[2-{Fe(η-C5H5)}B5H10] with [Mo(PMe2Ph)4H4] gave capped-closo-[1-{Fe(η-C5H5)}-2-{Mo(PMe 2Ph)3H}B5H7] which has been characterised by X-ray crystallography as well as by 11B and 1H NMR spectroscopy. 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(PMe 3)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