La4B2N5 crystallizes in the monoclinic C2/m space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 7-coordinate geometry to two equivalent N(2), two equivalent N(3), and three equivalent N(1) atoms. In the second La site, La(2) is bonded in a 6-coordinate geometry to one N(3), two equivalent N(1), and three equivalent N(2) atoms. B(1) is bonded in a bent 120 degrees geometry to one N(1) and one N(2) atom. There are three inequivalent N sites. In the first N site, N(1) is bonded in a 6-coordinate geometry to two equivalent La(2), three equivalent La(1), and one B(1) atom. In the second N site, N(2) is bonded in a distorted single-bond geometry to two equivalent La(1), three equivalent La(2), and one B(1) atom. In the third N site, N(3) is bonded to two equivalent La(2) and four equivalent La(1) atoms to form edge-sharing NLa6 octahedra.
La4B2N5 crystallizes in the monoclinic C2/m space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 7-coordinate geometry to two equivalent N(2), two equivalent N(3), and three equivalent N(1) atoms. Both La(1)-N(2) bond lengths are 2.74 Å. Both La(1)-N(3) bond lengths are 2.64 Å. There is one shorter (2.47 Å) and two longer (2.75 Å) La(1)-N(1) bond lengths. In the second La site, La(2) is bonded in a 6-coordinate geometry to one N(3), two equivalent N(1), and three equivalent N(2) atoms. The La(2)-N(3) bond length is 2.65 Å. Both La(2)-N(1) bond lengths are 2.65 Å. There is one shorter (2.52 Å) and two longer (2.58 Å) La(2)-N(2) bond lengths. B(1) is bonded in a bent 120 degrees geometry to one N(1) and one N(2) atom. The B(1)-N(1) bond length is 1.49 Å. The B(1)-N(2) bond length is 1.48 Å. There are three inequivalent N sites. In the first N site, N(1) is bonded in a 6-coordinate geometry to two equivalent La(2), three equivalent La(1), and one B(1) atom. In the second N site, N(2) is bonded in a distorted single-bond geometry to two equivalent La(1), three equivalent La(2), and one B(1) atom. In the third N site, N(3) is bonded to two equivalent La(2) and four equivalent La(1) atoms to form edge-sharing NLa6 octahedra.