OsSi2 is Magnesium tetraboride-like structured and crystallizes in the monoclinic C2/m space group. Os(1) is bonded in a 8-coordinate geometry to three equivalent Si(2) and five equivalent Si(1) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 5-coordinate geometry to five equivalent Os(1) atoms. In the second Si site, Si(2) is bonded in a 6-coordinate geometry to three equivalent Os(1) and three equivalent Si(2) atoms.
OsSi2 is Magnesium tetraboride-like structured and crystallizes in the monoclinic C2/m space group. Os(1) is bonded in a 8-coordinate geometry to three equivalent Si(2) and five equivalent Si(1) atoms. There are two shorter (2.44 Å) and one longer (2.50 Å) Os(1)-Si(2) bond length. There are a spread of Os(1)-Si(1) bond distances ranging from 2.50-2.58 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 5-coordinate geometry to five equivalent Os(1) atoms. In the second Si site, Si(2) is bonded in a 6-coordinate geometry to three equivalent Os(1) and three equivalent Si(2) atoms. There is one shorter (2.28 Å) and two longer (2.59 Å) Si(2)-Si(2) bond lengths.