Mn2NiN2 crystallizes in the trigonal P-3m1 space group. Mn(1) is bonded to four equivalent N(1) atoms to form distorted MnN4 trigonal pyramids that share corners with six equivalent Ni(1)N6 cuboctahedra, corners with six equivalent Mn(1)N4 trigonal pyramids, edges with three equivalent Ni(1)N6 cuboctahedra, and edges with three equivalent Mn(1)N4 trigonal pyramids. Ni(1) is bonded to six equivalent N(1) atoms to form distorted NiN6 cuboctahedra that share corners with twelve equivalent Mn(1)N4 trigonal pyramids, edges with six equivalent Ni(1)N6 cuboctahedra, and edges with six equivalent Mn(1)N4 trigonal pyramids. N(1) is bonded in a 7-coordinate geometry to four equivalent Mn(1) and three equivalent Ni(1) atoms.
Mn2NiN2 crystallizes in the trigonal P-3m1 space group. Mn(1) is bonded to four equivalent N(1) atoms to form distorted MnN4 trigonal pyramids that share corners with six equivalent Ni(1)N6 cuboctahedra, corners with six equivalent Mn(1)N4 trigonal pyramids, edges with three equivalent Ni(1)N6 cuboctahedra, and edges with three equivalent Mn(1)N4 trigonal pyramids. There are three shorter (1.86 Å) and one longer (2.03 Å) Mn(1)-N(1) bond length. Ni(1) is bonded to six equivalent N(1) atoms to form distorted NiN6 cuboctahedra that share corners with twelve equivalent Mn(1)N4 trigonal pyramids, edges with six equivalent Ni(1)N6 cuboctahedra, and edges with six equivalent Mn(1)N4 trigonal pyramids. All Ni(1)-N(1) bond lengths are 2.39 Å. N(1) is bonded in a 7-coordinate geometry to four equivalent Mn(1) and three equivalent Ni(1) atoms.