Nd2Mn22C3 crystallizes in the monoclinic C2/m space group. Nd(1) is bonded in a distorted T-shaped geometry to two equivalent Mn(4), four equivalent Mn(7), one C(2), and two equivalent C(1) atoms. There are eight inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 10-coordinate geometry to two equivalent Mn(4), four equivalent Mn(6), and four equivalent Mn(7) atoms. In the second Mn site, Mn(2) is bonded in a 10-coordinate geometry to two equivalent Mn(4), two equivalent Mn(5), two equivalent Mn(6), two equivalent Mn(7), and two equivalent Mn(8) atoms. In the third Mn site, Mn(3) is bonded in a 10-coordinate geometry to two equivalent Mn(4), four equivalent Mn(5), and four equivalent Mn(8) atoms. In the fourth Mn site, Mn(4) is bonded in a 14-coordinate geometry to two equivalent Nd(1), one Mn(1), one Mn(3), two equivalent Mn(2), two equivalent Mn(5), two equivalent Mn(6), two equivalent Mn(7), and two equivalent Mn(8) atoms. In the fifth Mn site, Mn(5) is bonded in a single-bond geometry to one Mn(2), one Mn(3), one Mn(4), one Mn(7), and one C(2) atom. In the sixth Mn site, Mn(6) is bonded in a single-bond geometry to one Mn(1), one Mn(2), one Mn(4), two equivalent Mn(7), and one C(1) atom. In the seventh Mn site, Mn(7) is bonded to two equivalent Nd(1), one Mn(1), one Mn(2), one Mn(4), one Mn(5), two equivalent Mn(6), two equivalent Mn(7), and two equivalent Mn(8) atoms to form distorted MnNd2Mn10 cuboctahedra that share corners with two equivalent Mn(7)Nd2Mn10 cuboctahedra, corners with three equivalent C(1)Nd2Mn4 octahedra, corners with three equivalent C(2)Nd2Mn4 octahedra,  an edgeedge with one C(1)Nd2Mn4 octahedra, faces with four equivalent Mn(7)Nd2Mn10 cuboctahedra, and  a faceface with one C(1)Nd2Mn4 octahedra. The corner-sharing octahedral tilt angles range from 24-71°. In the eighth Mn site, Mn(8) is bonded in a single-bond geometry to one Mn(2), one Mn(3), one Mn(4), two equivalent Mn(7), and one C(1) atom. There are two inequivalent C sites. In the first C site, C(1) is bonded to two equivalent Nd(1), two equivalent Mn(6), and two equivalent Mn(8) atoms to form CNd2Mn4 octahedra that share corners with six equivalent Mn(7)Nd2Mn10 cuboctahedra, corners with two equivalent C(1)Nd2Mn4 octahedra, corners with two equivalent C(2)Nd2Mn4 octahedra, edges with two equivalent Mn(7)Nd2Mn10 cuboctahedra, and faces with two equivalent Mn(7)Nd2Mn10 cuboctahedra. The corner-sharing octahedral tilt angles range from 36-85°. In the second C site, C(2) is bonded to two equivalent Nd(1) and four equivalent Mn(5) atoms to form distorted CNd2Mn4 octahedra that share corners with twelve equivalent Mn(7)Nd2Mn10 cuboctahedra and corners with four equivalent C(1)Nd2Mn4 octahedra. The corner-sharing octahedral tilt angles are 85°.
Nd2Mn22C3 crystallizes in the monoclinic C2/m space group. Nd(1) is bonded in a distorted T-shaped geometry to two equivalent Mn(4), four equivalent Mn(7), one C(2), and two equivalent C(1) atoms. There is one shorter (3.19 Å) and one longer (3.26 Å) Nd(1)-Mn(4) bond length. There are two shorter (3.12 Å) and two longer (3.24 Å) Nd(1)-Mn(7) bond lengths. The Nd(1)-C(2) bond length is 2.64 Å. Both Nd(1)-C(1) bond lengths are 2.59 Å. There are eight inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 10-coordinate geometry to two equivalent Mn(4), four equivalent Mn(6), and four equivalent Mn(7) atoms. Both Mn(1)-Mn(4) bond lengths are 2.66 Å. All Mn(1)-Mn(6) bond lengths are 2.35 Å. All Mn(1)-Mn(7) bond lengths are 2.39 Å. In the second Mn site, Mn(2) is bonded in a 10-coordinate geometry to two equivalent Mn(4), two equivalent Mn(5), two equivalent Mn(6), two equivalent Mn(7), and two equivalent Mn(8) atoms. Both Mn(2)-Mn(4) bond lengths are 2.58 Å. Both Mn(2)-Mn(5) bond lengths are 2.38 Å. Both Mn(2)-Mn(6) bond lengths are 2.41 Å. Both Mn(2)-Mn(7) bond lengths are 2.41 Å. Both Mn(2)-Mn(8) bond lengths are 2.40 Å. In the third Mn site, Mn(3) is bonded in a 10-coordinate geometry to two equivalent Mn(4), four equivalent Mn(5), and four equivalent Mn(8) atoms. Both Mn(3)-Mn(4) bond lengths are 2.64 Å. All Mn(3)-Mn(5) bond lengths are 2.40 Å. All Mn(3)-Mn(8) bond lengths are 2.40 Å. In the fourth Mn site, Mn(4) is bonded in a 14-coordinate geometry to two equivalent Nd(1), one Mn(1), one Mn(3), two equivalent Mn(2), two equivalent Mn(5), two equivalent Mn(6), two equivalent Mn(7), and two equivalent Mn(8) atoms. Both Mn(4)-Mn(5) bond lengths are 2.66 Å. Both Mn(4)-Mn(6) bond lengths are 2.65 Å. Both Mn(4)-Mn(7) bond lengths are 2.62 Å. Both Mn(4)-Mn(8) bond lengths are 2.70 Å. In the fifth Mn site, Mn(5) is bonded in a single-bond geometry to one Mn(2), one Mn(3), one Mn(4), one Mn(7), and one C(2) atom. The Mn(5)-Mn(7) bond length is 2.54 Å. The Mn(5)-C(2) bond length is 1.86 Å. In the sixth Mn site, Mn(6) is bonded in a single-bond geometry to one Mn(1), one Mn(2), one Mn(4), two equivalent Mn(7), and one C(1) atom. There is one shorter (2.50 Å) and one longer (2.57 Å) Mn(6)-Mn(7) bond length. The Mn(6)-C(1) bond length is 1.86 Å. In the seventh Mn site, Mn(7) is bonded to two equivalent Nd(1), one Mn(1), one Mn(2), one Mn(4), one Mn(5), two equivalent Mn(6), two equivalent Mn(7), and two equivalent Mn(8) atoms to form distorted MnNd2Mn10 cuboctahedra that share corners with two equivalent Mn(7)Nd2Mn10 cuboctahedra, corners with three equivalent C(1)Nd2Mn4 octahedra, corners with three equivalent C(2)Nd2Mn4 octahedra,  an edgeedge with one C(1)Nd2Mn4 octahedra, faces with four equivalent Mn(7)Nd2Mn10 cuboctahedra, and  a faceface with one C(1)Nd2Mn4 octahedra. The corner-sharing octahedral tilt angles range from 24-71°. There is one shorter (2.42 Å) and one longer (2.64 Å) Mn(7)-Mn(7) bond length. There is one shorter (2.42 Å) and one longer (2.52 Å) Mn(7)-Mn(8) bond length. In the eighth Mn site, Mn(8) is bonded in a single-bond geometry to one Mn(2), one Mn(3), one Mn(4), two equivalent Mn(7), and one C(1) atom. The Mn(8)-C(1) bond length is 1.86 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded to two equivalent Nd(1), two equivalent Mn(6), and two equivalent Mn(8) atoms to form CNd2Mn4 octahedra that share corners with six equivalent Mn(7)Nd2Mn10 cuboctahedra, corners with two equivalent C(1)Nd2Mn4 octahedra, corners with two equivalent C(2)Nd2Mn4 octahedra, edges with two equivalent Mn(7)Nd2Mn10 cuboctahedra, and faces with two equivalent Mn(7)Nd2Mn10 cuboctahedra. The corner-sharing octahedral tilt angles range from 36-85°. In the second C site, C(2) is bonded to two equivalent Nd(1) and four equivalent Mn(5) atoms to form distorted CNd2Mn4 octahedra that share corners with twelve equivalent Mn(7)Nd2Mn10 cuboctahedra and corners with four equivalent C(1)Nd2Mn4 octahedra. The corner-sharing octahedral tilt angles are 85°.