An unusual agostic stabilised ruthenium boryl complex [Ru(IPr)2(CO)(Bcat)]+ (IPr = bis(1,3-(2,6-diisopropylphenyl)imidazol-2-ylidene; Bcat = catecholborane) has been characterised by X-ray crystallography. Neutron data will afford accurate measurement of the Ru-H-C distance and, as such, provide structural information that will facilitate understanding of the of how structure relates to the catalytic alkene hydroboration activity of this complex. In Ru(IMe4)2(PPh3)(HSiPh3)H2, an alternative form of sigma bonding that involves 2-Ph3SiH coordination has been evidenced by NMR spectroscopy and X-ray crystallography. Neutron diffraction studies on this complex will afford definitive data on Ru-H and Si-H positions, information vital to understanding the role of this species as an intermediate in the catalytic hydrodefluorination reactions. We request 14-15 days