The title compound, hexadecacarbonyl-1 kappa(3)C, 2 kappa(3)C,-3 kappa
(3) C, 4 kappa(4) C, 5 kappa(3) C-di-mu-hydrido-1:2 kappa(2)H; 1:3 kap
pa(2)H-pentaosmium(8 Os-Os), has been crystallized in a different crys
tal form from that reported previously [Guy & Sheldrick (1978). Acta C
ryst. B34, 1725-1727]. The form reported here has crystallographic mir
ror symmetry and the packing arrangement in the crystal exhibits a dif
ferent relative orientation of the molecules from the earlier structur
e.