[(CO)H(PPh₃)₂-arachno-OsB₃H₈]

A single-crystal X-ray diffraction study of the species 2-carbonyl2-hydrido-trans-2,2-bis(triphenylphosphine)-2-osma-arachno-tetraborane confirms the structure as a tetraborane(10) butterfly with a trans-[(CO)H(PPh₃)₂Os] group replacing a BH₂ group at a wing-tip or 2-position. It is compared with the previously reported ruthenaborane analogue (CO)H(PPh₃)₂-arachno-RuB₃H₈.

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