W4BN9 crystallizes in the hexagonal P6_3 space group. There are two inequivalent W sites. In the first W site, W(1) is bonded to two equivalent N(1), two equivalent N(2), and two equivalent N(3) atoms to form a mixture of distorted corner and edge-sharing WN6 octahedra. The corner-sharing octahedral tilt angles range from 46-59°. In the second W site, W(2) is bonded to three equivalent N(2) and three equivalent N(3) atoms to form a mixture of corner and edge-sharing WN6 octahedra. The corner-sharing octahedral tilt angles range from 51-52°. B(1) is bonded in a trigonal planar geometry to three equivalent N(1) atoms. There are three inequivalent N sites. In the first N site, N(1) is bonded in a 3-coordinate geometry to two equivalent W(1) and one B(1) atom. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one W(2) and two equivalent W(1) atoms. In the third N site, N(3) is bonded in a 3-coordinate geometry to one W(2) and two equivalent W(1) atoms.
W4BN9 crystallizes in the hexagonal P6_3 space group. There are two inequivalent W sites. In the first W site, W(1) is bonded to two equivalent N(1), two equivalent N(2), and two equivalent N(3) atoms to form a mixture of distorted corner and edge-sharing WN6 octahedra. The corner-sharing octahedral tilt angles range from 46-59°. There is one shorter (1.88 Å) and one longer (2.44 Å) W(1)-N(1) bond length. There is one shorter (2.03 Å) and one longer (2.10 Å) W(1)-N(2) bond length. There is one shorter (1.85 Å) and one longer (2.22 Å) W(1)-N(3) bond length. In the second W site, W(2) is bonded to three equivalent N(2) and three equivalent N(3) atoms to form a mixture of corner and edge-sharing WN6 octahedra. The corner-sharing octahedral tilt angles range from 51-52°. All W(2)-N(2) bond lengths are 1.93 Å. All W(2)-N(3) bond lengths are 2.12 Å. B(1) is bonded in a trigonal planar geometry to three equivalent N(1) atoms. All B(1)-N(1) bond lengths are 1.48 Å. There are three inequivalent N sites. In the first N site, N(1) is bonded in a 3-coordinate geometry to two equivalent W(1) and one B(1) atom. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one W(2) and two equivalent W(1) atoms. In the third N site, N(3) is bonded in a 3-coordinate geometry to one W(2) and two equivalent W(1) atoms.