Ca2Os3B5 crystallizes in the monoclinic C2 space group. Ca(1) is bonded in a 2-coordinate geometry to two equivalent Os(1), two equivalent B(1), two equivalent B(2), and three equivalent B(3) atoms. There are two inequivalent Os sites. In the first Os site, Os(1) is bonded in a 10-coordinate geometry to four equivalent Ca(1), two equivalent B(3), and four equivalent B(2) atoms. In the second Os site, Os(2) is bonded in a 5-coordinate geometry to one B(1), one B(2), and three equivalent B(3) atoms. There are three inequivalent B sites. In the first B site, B(1) is bonded to four equivalent Ca(1) and two equivalent Os(2) atoms to form edge-sharing BCa4Os2 octahedra. In the second B site, B(2) is bonded in a 7-coordinate geometry to two equivalent Ca(1), one Os(2), two equivalent Os(1), one B(2), and one B(3) atom. In the third B site, B(3) is bonded in a 8-coordinate geometry to three equivalent Ca(1), one Os(1), three equivalent Os(2), and one B(2) atom.
Ca2Os3B5 crystallizes in the monoclinic C2 space group. Ca(1) is bonded in a 2-coordinate geometry to two equivalent Os(1), two equivalent B(1), two equivalent B(2), and three equivalent B(3) atoms. There is one shorter (3.16 Å) and one longer (3.29 Å) Ca(1)-Os(1) bond length. There is one shorter (2.70 Å) and one longer (2.71 Å) Ca(1)-B(1) bond length. There is one shorter (2.86 Å) and one longer (2.98 Å) Ca(1)-B(2) bond length. There are a spread of Ca(1)-B(3) bond distances ranging from 2.92-3.16 Å. There are two inequivalent Os sites. In the first Os site, Os(1) is bonded in a 10-coordinate geometry to four equivalent Ca(1), two equivalent B(3), and four equivalent B(2) atoms. Both Os(1)-B(3) bond lengths are 2.24 Å. There are two shorter (2.17 Å) and two longer (2.21 Å) Os(1)-B(2) bond lengths. In the second Os site, Os(2) is bonded in a 5-coordinate geometry to one B(1), one B(2), and three equivalent B(3) atoms. The Os(2)-B(1) bond length is 1.95 Å. The Os(2)-B(2) bond length is 2.11 Å. There are a spread of Os(2)-B(3) bond distances ranging from 2.12-2.26 Å. There are three inequivalent B sites. In the first B site, B(1) is bonded to four equivalent Ca(1) and two equivalent Os(2) atoms to form edge-sharing BCa4Os2 octahedra. In the second B site, B(2) is bonded in a 7-coordinate geometry to two equivalent Ca(1), one Os(2), two equivalent Os(1), one B(2), and one B(3) atom. The B(2)-B(2) bond length is 1.65 Å. The B(2)-B(3) bond length is 1.73 Å. In the third B site, B(3) is bonded in a 8-coordinate geometry to three equivalent Ca(1), one Os(1), three equivalent Os(2), and one B(2) atom.