CrN2 is Keatite-like structured and crystallizes in the monoclinic C2/m space group. There are seven inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one N(1), one N(2), and two equivalent N(3) atoms to form corner-sharing CrN4 tetrahedra. In the second Cr site, Cr(2) is bonded to one N(1), one N(2), and two equivalent N(5) atoms to form corner-sharing CrN4 tetrahedra. In the third Cr site, Cr(3) is bonded to one N(4), one N(6), and two equivalent N(3) atoms to form corner-sharing CrN4 tetrahedra. In the fourth Cr site, Cr(4) is bonded to one N(10), one N(9), and two equivalent N(5) atoms to form corner-sharing CrN4 tetrahedra. In the fifth Cr site, Cr(5) is bonded to one N(10), one N(4), and two equivalent N(8) atoms to form corner-sharing CrN4 tetrahedra. In the sixth Cr site, Cr(6) is bonded to one N(11), one N(9), and two equivalent N(8) atoms to form corner-sharing CrN4 tetrahedra. In the seventh Cr site, Cr(7) is bonded to one N(11), one N(6), and two equivalent N(7) atoms to form corner-sharing CrN4 tetrahedra. There are eleven inequivalent N sites. In the first N site, N(3) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(3) atom. In the second N site, N(4) is bonded in a linear geometry to one Cr(3) and one Cr(5) atom. In the third N site, N(5) is bonded in a bent 150 degrees geometry to one Cr(2) and one Cr(4) atom. In the fourth N site, N(6) is bonded in a bent 150 degrees geometry to one Cr(3) and one Cr(7) atom. In the fifth N site, N(7) is bonded in a linear geometry to two equivalent Cr(7) atoms. In the sixth N site, N(8) is bonded in a bent 150 degrees geometry to one Cr(5) and one Cr(6) atom. In the seventh N site, N(9) is bonded in a bent 150 degrees geometry to one Cr(4) and one Cr(6) atom. In the eighth N site, N(10) is bonded in a linear geometry to one Cr(4) and one Cr(5) atom. In the ninth N site, N(11) is bonded in a linear geometry to one Cr(6) and one Cr(7) atom. In the tenth N site, N(1) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(2) atom. In the eleventh N site, N(2) is bonded in a linear geometry to one Cr(1) and one Cr(2) atom.
CrN2 is Keatite-like structured and crystallizes in the monoclinic C2/m space group. There are seven inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one N(1), one N(2), and two equivalent N(3) atoms to form corner-sharing CrN4 tetrahedra. The Cr(1)-N(1) bond length is 1.73 Å. The Cr(1)-N(2) bond length is 1.70 Å. Both Cr(1)-N(3) bond lengths are 1.73 Å. In the second Cr site, Cr(2) is bonded to one N(1), one N(2), and two equivalent N(5) atoms to form corner-sharing CrN4 tetrahedra. The Cr(2)-N(1) bond length is 1.73 Å. The Cr(2)-N(2) bond length is 1.75 Å. Both Cr(2)-N(5) bond lengths are 1.72 Å. In the third Cr site, Cr(3) is bonded to one N(4), one N(6), and two equivalent N(3) atoms to form corner-sharing CrN4 tetrahedra. The Cr(3)-N(4) bond length is 1.73 Å. The Cr(3)-N(6) bond length is 1.73 Å. Both Cr(3)-N(3) bond lengths are 1.72 Å. In the fourth Cr site, Cr(4) is bonded to one N(10), one N(9), and two equivalent N(5) atoms to form corner-sharing CrN4 tetrahedra. The Cr(4)-N(10) bond length is 1.69 Å. The Cr(4)-N(9) bond length is 1.73 Å. Both Cr(4)-N(5) bond lengths are 1.75 Å. In the fifth Cr site, Cr(5) is bonded to one N(10), one N(4), and two equivalent N(8) atoms to form corner-sharing CrN4 tetrahedra. The Cr(5)-N(10) bond length is 1.75 Å. The Cr(5)-N(4) bond length is 1.71 Å. Both Cr(5)-N(8) bond lengths are 1.73 Å. In the sixth Cr site, Cr(6) is bonded to one N(11), one N(9), and two equivalent N(8) atoms to form corner-sharing CrN4 tetrahedra. The Cr(6)-N(11) bond length is 1.71 Å. The Cr(6)-N(9) bond length is 1.74 Å. Both Cr(6)-N(8) bond lengths are 1.74 Å. In the seventh Cr site, Cr(7) is bonded to one N(11), one N(6), and two equivalent N(7) atoms to form corner-sharing CrN4 tetrahedra. The Cr(7)-N(11) bond length is 1.73 Å. The Cr(7)-N(6) bond length is 1.73 Å. Both Cr(7)-N(7) bond lengths are 1.73 Å. There are eleven inequivalent N sites. In the first N site, N(3) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(3) atom. In the second N site, N(4) is bonded in a linear geometry to one Cr(3) and one Cr(5) atom. In the third N site, N(5) is bonded in a bent 150 degrees geometry to one Cr(2) and one Cr(4) atom. In the fourth N site, N(6) is bonded in a bent 150 degrees geometry to one Cr(3) and one Cr(7) atom. In the fifth N site, N(7) is bonded in a linear geometry to two equivalent Cr(7) atoms. In the sixth N site, N(8) is bonded in a bent 150 degrees geometry to one Cr(5) and one Cr(6) atom. In the seventh N site, N(9) is bonded in a bent 150 degrees geometry to one Cr(4) and one Cr(6) atom. In the eighth N site, N(10) is bonded in a linear geometry to one Cr(4) and one Cr(5) atom. In the ninth N site, N(11) is bonded in a linear geometry to one Cr(6) and one Cr(7) atom. In the tenth N site, N(1) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(2) atom. In the eleventh N site, N(2) is bonded in a linear geometry to one Cr(1) and one Cr(2) atom.