J. Bould et al., The nido-osmaboranes [2,2,2-(CO)-(PPh3)(2)-nido-2-OsB5H9] and [6,6,6-(CO)(PPh3)(2)-nido-6-OsB9H13], ACT CRYST C, 57, 2001, pp. 1245-1247
The structural characterization of the osmahexaborane 2-carbonyl-2,2-bis(tr
iphenylphosphine)-nido-2-osmahexabor- ane(9), [Os(B5H9)(C18H15P)(2) (CO)],
(I), a metallaborane analogue of B6H10, confirms the structure proposed fro
m NMR spectroscopy. The structure of the osmadecaborane 6-carbonyl-6,6-bis(
triphenylphosphine)-nido-6-osmadecabor- ane(13), [Os(B9H13)(C18H15P)(2) (CO
)], (IV), is similarly confirmed. The short basal B-B distance of 1.652 (8)
Angstrom in (I), not bridged by an H atom, mirrors that in the parent hexa
borane(10) [1.626 (4) Angstrom].