Hf2ON2 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Hf sites. In the first Hf site, Hf(1) is bonded in a 8-coordinate geometry to two equivalent N(1), four equivalent N(2), and two equivalent O(1) atoms. In the second Hf site, Hf(2) is bonded in a 7-coordinate geometry to one N(2), three equivalent N(1), and three equivalent O(1) atoms. There are two inequivalent N sites. In the first N site, N(1) is bonded to two equivalent Hf(1) and three equivalent Hf(2) atoms to form a mixture of edge, corner, and face-sharing NHf5 square pyramids. In the second N site, N(2) is bonded to one Hf(2) and four equivalent Hf(1) atoms to form a mixture of distorted edge, corner, and face-sharing NHf5 square pyramids. O(1) is bonded in a 5-coordinate geometry to two equivalent Hf(1) and three equivalent Hf(2) atoms.
Hf2ON2 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Hf sites. In the first Hf site, Hf(1) is bonded in a 8-coordinate geometry to two equivalent N(1), four equivalent N(2), and two equivalent O(1) atoms. Both Hf(1)-N(1) bond lengths are 2.30 Å. There are two shorter (2.17 Å) and two longer (2.32 Å) Hf(1)-N(2) bond lengths. There is one shorter (2.45 Å) and one longer (2.60 Å) Hf(1)-O(1) bond length. In the second Hf site, Hf(2) is bonded in a 7-coordinate geometry to one N(2), three equivalent N(1), and three equivalent O(1) atoms. The Hf(2)-N(2) bond length is 2.22 Å. There are two shorter (2.16 Å) and one longer (2.26 Å) Hf(2)-N(1) bond length. There are two shorter (2.15 Å) and one longer (2.44 Å) Hf(2)-O(1) bond length. There are two inequivalent N sites. In the first N site, N(1) is bonded to two equivalent Hf(1) and three equivalent Hf(2) atoms to form a mixture of edge, corner, and face-sharing NHf5 square pyramids. In the second N site, N(2) is bonded to one Hf(2) and four equivalent Hf(1) atoms to form a mixture of distorted edge, corner, and face-sharing NHf5 square pyramids. O(1) is bonded in a 5-coordinate geometry to two equivalent Hf(1) and three equivalent Hf(2) atoms.