OsSi3 is alpha bismuth trifluoride structured and crystallizes in the tetragonal I4/mmm space group. Os(1) is bonded in a distorted body-centered cubic geometry to six equivalent Si(2) and eight equivalent Si(1) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a distorted body-centered cubic geometry to four equivalent Os(1) and four equivalent Si(2) atoms. In the second Si site, Si(2) is bonded to six equivalent Os(1) and eight equivalent Si(1) atoms to form a mixture of distorted corner and face-sharing SiSi8Os6 cuboctahedra.
OsSi3 is alpha bismuth trifluoride structured and crystallizes in the tetragonal I4/mmm space group. Os(1) is bonded in a distorted body-centered cubic geometry to six equivalent Si(2) and eight equivalent Si(1) atoms. There are four shorter (2.94 Å) and two longer (3.14 Å) Os(1)-Si(2) bond lengths. All Os(1)-Si(1) bond lengths are 2.61 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a distorted body-centered cubic geometry to four equivalent Os(1) and four equivalent Si(2) atoms. All Si(1)-Si(2) bond lengths are 2.61 Å. In the second Si site, Si(2) is bonded to six equivalent Os(1) and eight equivalent Si(1) atoms to form a mixture of distorted corner and face-sharing SiSi8Os6 cuboctahedra.