B2(CN2)3 crystallizes in the triclinic P-1 space group. There are four inequivalent B sites. In the first B site, B(1) is bonded to one N(12), one N(3), one N(6), and one N(8) atom to form BN4 tetrahedra that share  a cornercorner with one C(1)N4 tetrahedra,  a cornercorner with one C(2)N4 tetrahedra,  a cornercorner with one C(3)N4 tetrahedra, corners with two equivalent C(4)N4 tetrahedra, and corners with three equivalent C(6)N4 tetrahedra. In the second B site, B(2) is bonded to one N(11), one N(2), and two equivalent N(10) atoms to form BN4 tetrahedra that share  a cornercorner with one B(3)N4 tetrahedra,  a cornercorner with one C(2)N4 tetrahedra,  a cornercorner with one C(5)N4 tetrahedra,  a cornercorner with one C(6)N4 tetrahedra, corners with two equivalent C(3)N4 tetrahedra, corners with three equivalent C(1)N4 tetrahedra, and  an edgeedge with one B(2)N4 tetrahedra. In the third B site, B(3) is bonded to one N(11), one N(5), one N(7), and one N(9) atom to form BN4 tetrahedra that share  a cornercorner with one B(2)N4 tetrahedra,  a cornercorner with one C(1)N4 tetrahedra,  a cornercorner with one C(3)N4 tetrahedra,  a cornercorner with one C(4)N4 tetrahedra, corners with three equivalent C(5)N4 tetrahedra, and  an edgeedge with one C(2)N4 tetrahedra. In the fourth B site, B(4) is bonded in a trigonal planar geometry to one N(1), one N(3), and one N(4) atom. There are six inequivalent C sites. In the first C site, C(1) is bonded to one N(10), one N(2), one N(6), and one N(9) atom to form CN4 tetrahedra that share  a cornercorner with one B(1)N4 tetrahedra,  a cornercorner with one B(3)N4 tetrahedra,  a cornercorner with one C(3)N4 tetrahedra,  a cornercorner with one C(4)N4 tetrahedra,  a cornercorner with one C(5)N4 tetrahedra,  a cornercorner with one C(6)N4 tetrahedra, and corners with three equivalent B(2)N4 tetrahedra. In the second C site, C(2) is bonded to one N(11), one N(12), one N(4), and one N(7) atom to form CN4 tetrahedra that share  a cornercorner with one B(1)N4 tetrahedra,  a cornercorner with one B(2)N4 tetrahedra,  a cornercorner with one C(5)N4 tetrahedra,  a cornercorner with one C(6)N4 tetrahedra, corners with two equivalent C(4)N4 tetrahedra, and  an edgeedge with one B(3)N4 tetrahedra. In the third C site, C(3) is bonded to one N(1), one N(10), one N(5), and one N(8) atom to form CN4 tetrahedra that share  a cornercorner with one B(1)N4 tetrahedra,  a cornercorner with one B(3)N4 tetrahedra,  a cornercorner with one C(1)N4 tetrahedra,  a cornercorner with one C(6)N4 tetrahedra, corners with two equivalent B(2)N4 tetrahedra, and corners with two equivalent C(5)N4 tetrahedra. In the fourth C site, C(4) is bonded to one N(3), one N(4), one N(6), and one N(7) atom to form CN4 tetrahedra that share  a cornercorner with one B(3)N4 tetrahedra,  a cornercorner with one C(1)N4 tetrahedra,  a cornercorner with one C(6)N4 tetrahedra, corners with two equivalent B(1)N4 tetrahedra, and corners with two equivalent C(2)N4 tetrahedra. In the fifth C site, C(5) is bonded to one N(1), one N(11), one N(5), and one N(9) atom to form CN4 tetrahedra that share  a cornercorner with one B(2)N4 tetrahedra,  a cornercorner with one C(1)N4 tetrahedra,  a cornercorner with one C(2)N4 tetrahedra, corners with two equivalent C(3)N4 tetrahedra, and corners with three equivalent B(3)N4 tetrahedra. In the sixth C site, C(6) is bonded to one N(12), one N(2), one N(3), and one N(8) atom to form CN4 tetrahedra that share  a cornercorner with one B(2)N4 tetrahedra,  a cornercorner with one C(1)N4 tetrahedra,  a cornercorner with one C(2)N4 tetrahedra,  a cornercorner with one C(3)N4 tetrahedra,  a cornercorner with one C(4)N4 tetrahedra, and corners with three equivalent B(1)N4 tetrahedra. There are twelve inequivalent N sites. In the first N site, N(1) is bonded in a trigonal non-coplanar geometry to one B(4), one C(3), and one C(5) atom. In the second N site, N(2) is bonded in a trigonal non-coplanar geometry to one B(2), one C(1), and one C(6) atom. In the third N site, N(3) is bonded in a tetrahedral geometry to one B(1), one B(4), one C(4), and one C(6) atom. In the fourth N site, N(4) is bonded in a trigonal non-coplanar geometry to one B(4), one C(2), and one C(4) atom. In the fifth N site, N(5) is bonded in a trigonal planar geometry to one B(3), one C(3), and one C(5) atom. In the sixth N site, N(6) is bonded in a trigonal planar geometry to one B(1), one C(1), and one C(4) atom. In the seventh N site, N(7) is bonded in a trigonal non-coplanar geometry to one B(3), one C(2), and one C(4) atom. In the eighth N site, N(8) is bonded in a trigonal non-coplanar geometry to one B(1), one C(3), and one C(6) atom. In the ninth N site, N(9) is bonded in a trigonal non-coplanar geometry to one B(3), one C(1), and one C(5) atom. In the tenth N site, N(10) is bonded to two equivalent B(2), one C(1), and one C(3) atom to form a mixture of edge and corner-sharing NB2C2 tetrahedra. In the eleventh N site, N(11) is bonded to one B(2), one B(3), one C(2), and one C(5) atom to form corner-sharing NB2C2 tetrahedra. In the twelfth N site, N(12) is bonded in a trigonal planar geometry to one B(1), one C(2), and one C(6) atom.
B2(CN2)3 crystallizes in the triclinic P-1 space group. There are four inequivalent B sites. In the first B site, B(1) is bonded to one N(12), one N(3), one N(6), and one N(8) atom to form BN4 tetrahedra that share  a cornercorner with one C(1)N4 tetrahedra,  a cornercorner with one C(2)N4 tetrahedra,  a cornercorner with one C(3)N4 tetrahedra, corners with two equivalent C(4)N4 tetrahedra, and corners with three equivalent C(6)N4 tetrahedra. The B(1)-N(12) bond length is 1.49 Å. The B(1)-N(3) bond length is 1.71 Å. The B(1)-N(6) bond length is 1.46 Å. The B(1)-N(8) bond length is 1.56 Å. In the second B site, B(2) is bonded to one N(11), one N(2), and two equivalent N(10) atoms to form BN4 tetrahedra that share  a cornercorner with one B(3)N4 tetrahedra,  a cornercorner with one C(2)N4 tetrahedra,  a cornercorner with one C(5)N4 tetrahedra,  a cornercorner with one C(6)N4 tetrahedra, corners with two equivalent C(3)N4 tetrahedra, corners with three equivalent C(1)N4 tetrahedra, and  an edgeedge with one B(2)N4 tetrahedra. The B(2)-N(11) bond length is 1.52 Å. The B(2)-N(2) bond length is 1.47 Å. There is one shorter (1.56 Å) and one longer (1.63 Å) B(2)-N(10) bond length. In the third B site, B(3) is bonded to one N(11), one N(5), one N(7), and one N(9) atom to form BN4 tetrahedra that share  a cornercorner with one B(2)N4 tetrahedra,  a cornercorner with one C(1)N4 tetrahedra,  a cornercorner with one C(3)N4 tetrahedra,  a cornercorner with one C(4)N4 tetrahedra, corners with three equivalent C(5)N4 tetrahedra, and  an edgeedge with one C(2)N4 tetrahedra. The B(3)-N(11) bond length is 1.63 Å. The B(3)-N(5) bond length is 1.53 Å. The B(3)-N(7) bond length is 1.58 Å. The B(3)-N(9) bond length is 1.47 Å. In the fourth B site, B(4) is bonded in a trigonal planar geometry to one N(1), one N(3), and one N(4) atom. The B(4)-N(1) bond length is 1.43 Å. The B(4)-N(3) bond length is 1.50 Å. The B(4)-N(4) bond length is 1.44 Å. There are six inequivalent C sites. In the first C site, C(1) is bonded to one N(10), one N(2), one N(6), and one N(9) atom to form CN4 tetrahedra that share  a cornercorner with one B(1)N4 tetrahedra,  a cornercorner with one B(3)N4 tetrahedra,  a cornercorner with one C(3)N4 tetrahedra,  a cornercorner with one C(4)N4 tetrahedra,  a cornercorner with one C(5)N4 tetrahedra,  a cornercorner with one C(6)N4 tetrahedra, and corners with three equivalent B(2)N4 tetrahedra. The C(1)-N(10) bond length is 1.59 Å. The C(1)-N(2) bond length is 1.50 Å. The C(1)-N(6) bond length is 1.41 Å. The C(1)-N(9) bond length is 1.48 Å. In the second C site, C(2) is bonded to one N(11), one N(12), one N(4), and one N(7) atom to form CN4 tetrahedra that share  a cornercorner with one B(1)N4 tetrahedra,  a cornercorner with one B(2)N4 tetrahedra,  a cornercorner with one C(5)N4 tetrahedra,  a cornercorner with one C(6)N4 tetrahedra, corners with two equivalent C(4)N4 tetrahedra, and  an edgeedge with one B(3)N4 tetrahedra. The C(2)-N(11) bond length is 1.62 Å. The C(2)-N(12) bond length is 1.44 Å. The C(2)-N(4) bond length is 1.50 Å. The C(2)-N(7) bond length is 1.48 Å. In the third C site, C(3) is bonded to one N(1), one N(10), one N(5), and one N(8) atom to form CN4 tetrahedra that share  a cornercorner with one B(1)N4 tetrahedra,  a cornercorner with one B(3)N4 tetrahedra,  a cornercorner with one C(1)N4 tetrahedra,  a cornercorner with one C(6)N4 tetrahedra, corners with two equivalent B(2)N4 tetrahedra, and corners with two equivalent C(5)N4 tetrahedra. The C(3)-N(1) bond length is 1.50 Å. The C(3)-N(10) bond length is 1.55 Å. The C(3)-N(5) bond length is 1.44 Å. The C(3)-N(8) bond length is 1.47 Å. In the fourth C site, C(4) is bonded to one N(3), one N(4), one N(6), and one N(7) atom to form CN4 tetrahedra that share  a cornercorner with one B(3)N4 tetrahedra,  a cornercorner with one C(1)N4 tetrahedra,  a cornercorner with one C(6)N4 tetrahedra, corners with two equivalent B(1)N4 tetrahedra, and corners with two equivalent C(2)N4 tetrahedra. The C(4)-N(3) bond length is 1.55 Å. The C(4)-N(4) bond length is 1.46 Å. The C(4)-N(6) bond length is 1.42 Å. The C(4)-N(7) bond length is 1.52 Å. In the fifth C site, C(5) is bonded to one N(1), one N(11), one N(5), and one N(9) atom to form CN4 tetrahedra that share  a cornercorner with one B(2)N4 tetrahedra,  a cornercorner with one C(1)N4 tetrahedra,  a cornercorner with one C(2)N4 tetrahedra, corners with two equivalent C(3)N4 tetrahedra, and corners with three equivalent B(3)N4 tetrahedra. The C(5)-N(1) bond length is 1.55 Å. The C(5)-N(11) bond length is 1.47 Å. The C(5)-N(5) bond length is 1.46 Å. The C(5)-N(9) bond length is 1.49 Å. In the sixth C site, C(6) is bonded to one N(12), one N(2), one N(3), and one N(8) atom to form CN4 tetrahedra that share  a cornercorner with one B(2)N4 tetrahedra,  a cornercorner with one C(1)N4 tetrahedra,  a cornercorner with one C(2)N4 tetrahedra,  a cornercorner with one C(3)N4 tetrahedra,  a cornercorner with one C(4)N4 tetrahedra, and corners with three equivalent B(1)N4 tetrahedra. The C(6)-N(12) bond length is 1.46 Å. The C(6)-N(2) bond length is 1.48 Å. The C(6)-N(3) bond length is 1.61 Å. The C(6)-N(8) bond length is 1.49 Å. There are twelve inequivalent N sites. In the first N site, N(1) is bonded in a trigonal non-coplanar geometry to one B(4), one C(3), and one C(5) atom. In the second N site, N(2) is bonded in a trigonal non-coplanar geometry to one B(2), one C(1), and one C(6) atom. In the third N site, N(3) is bonded in a tetrahedral geometry to one B(1), one B(4), one C(4), and one C(6) atom. In the fourth N site, N(4) is bonded in a trigonal non-coplanar geometry to one B(4), one C(2), and one C(4) atom. In the fifth N site, N(5) is bonded in a trigonal planar geometry to one B(3), one C(3), and one C(5) atom. In the sixth N site, N(6) is bonded in a trigonal planar geometry to one B(1), one C(1), and one C(4) atom. In the seventh N site, N(7) is bonded in a trigonal non-coplanar geometry to one B(3), one C(2), and one C(4) atom. In the eighth N site, N(8) is bonded in a trigonal non-coplanar geometry to one B(1), one C(3), and one C(6) atom. In the ninth N site, N(9) is bonded in a trigonal non-coplanar geometry to one B(3), one C(1), and one C(5) atom. In the tenth N site, N(10) is bonded to two equivalent B(2), one C(1), and one C(3) atom to form a mixture of edge and corner-sharing NB2C2 tetrahedra. In the eleventh N site, N(11) is bonded to one B(2), one B(3), one C(2), and one C(5) atom to form corner-sharing NB2C2 tetrahedra. In the twelfth N site, N(12) is bonded in a trigonal planar geometry to one B(1), one C(2), and one C(6) atom.