BN crystallizes in the monoclinic Cm space group. There are four inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one N(1) and two equivalent N(2) atoms. In the second B site, B(2) is bonded in a trigonal planar geometry to one N(4) and two equivalent N(3) atoms. In the third B site, B(3) is bonded in a trigonal planar geometry to one N(1) and two equivalent N(4) atoms. In the fourth B site, B(4) is bonded to one N(2), one N(3), and two equivalent N(1) atoms to form corner-sharing BN4 tetrahedra. There are four inequivalent N sites. In the first N site, N(1) is bonded to one B(1), one B(3), and two equivalent B(4) atoms to form corner-sharing NB4 tetrahedra. In the second N site, N(2) is bonded in a trigonal planar geometry to one B(4) and two equivalent B(1) atoms. In the third N site, N(3) is bonded in a trigonal planar geometry to one B(4) and two equivalent B(2) atoms. In the fourth N site, N(4) is bonded in a trigonal planar geometry to one B(2) and two equivalent B(3) atoms.
BN crystallizes in the monoclinic Cm space group. There are four inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one N(1) and two equivalent N(2) atoms. The B(1)-N(1) bond length is 1.54 Å. Both B(1)-N(2) bond lengths are 1.43 Å. In the second B site, B(2) is bonded in a trigonal planar geometry to one N(4) and two equivalent N(3) atoms. The B(2)-N(4) bond length is 1.48 Å. Both B(2)-N(3) bond lengths are 1.44 Å. In the third B site, B(3) is bonded in a trigonal planar geometry to one N(1) and two equivalent N(4) atoms. The B(3)-N(1) bond length is 1.52 Å. Both B(3)-N(4) bond lengths are 1.44 Å. In the fourth B site, B(4) is bonded to one N(2), one N(3), and two equivalent N(1) atoms to form corner-sharing BN4 tetrahedra. The B(4)-N(2) bond length is 1.56 Å. The B(4)-N(3) bond length is 1.53 Å. Both B(4)-N(1) bond lengths are 1.57 Å. There are four inequivalent N sites. In the first N site, N(1) is bonded to one B(1), one B(3), and two equivalent B(4) atoms to form corner-sharing NB4 tetrahedra. In the second N site, N(2) is bonded in a trigonal planar geometry to one B(4) and two equivalent B(1) atoms. In the third N site, N(3) is bonded in a trigonal planar geometry to one B(4) and two equivalent B(2) atoms. In the fourth N site, N(4) is bonded in a trigonal planar geometry to one B(2) and two equivalent B(3) atoms.