Hf2ON2 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Hf sites. In the first Hf site, Hf(1) is bonded to two equivalent N(1), three equivalent N(2), and two equivalent O(1) atoms to form a mixture of distorted corner and edge-sharing HfN5O2 pentagonal bipyramids. In the second Hf site, Hf(2) is bonded in a 8-coordinate geometry to two equivalent 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 corner and edge-sharing NHf5 square pyramids. In the second N site, N(2) is bonded to two equivalent Hf(2) and three equivalent Hf(1) atoms to form a mixture of corner and edge-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 to two equivalent N(1), three equivalent N(2), and two equivalent O(1) atoms to form a mixture of distorted corner and edge-sharing HfN5O2 pentagonal bipyramids. Both Hf(1)-N(1) bond lengths are 2.24 Å. There are two shorter (2.16 Å) and one longer (2.22 Å) Hf(1)-N(2) bond length. There is one shorter (2.24 Å) and one longer (2.30 Å) Hf(1)-O(1) bond length. In the second Hf site, Hf(2) is bonded in a 8-coordinate geometry to two equivalent N(2), three equivalent N(1), and three equivalent O(1) atoms. Both Hf(2)-N(2) bond lengths are 2.31 Å. There are two shorter (2.23 Å) and one longer (2.24 Å) Hf(2)-N(1) bond length. There are two shorter (2.25 Å) and one longer (2.74 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 corner and edge-sharing NHf5 square pyramids. In the second N site, N(2) is bonded to two equivalent Hf(2) and three equivalent Hf(1) atoms to form a mixture of corner and edge-sharing NHf5 square pyramids. O(1) is bonded in a 5-coordinate geometry to two equivalent Hf(1) and three equivalent Hf(2) atoms.