This reddish - black polymorph is orthorhombic .
This reddish - black polymorph adopts a structure in which osmium centres are octahedrally coordinated , sharing opposite edges of the OsCl octahedra to form a chain .
This reddish - black polymorph is orthorhombic and adopts a structure in which osmium centres are octahedrally coordinated , sharing opposite edges of the OsCl octahedra to form a chain .