Ce2(MnNi)5 crystallizes in the orthorhombic Pmmm space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 18-coordinate geometry to two equivalent Mn(1), four equivalent Mn(2), four equivalent Ni(1), and eight equivalent Ni(2) atoms. In the second Ce site, Ce(2) is bonded in a 18-coordinate geometry to two equivalent Mn(2), four equivalent Mn(1), four equivalent Mn(3), and eight equivalent Ni(2) atoms. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 9-coordinate geometry to one Ce(1), two equivalent Ce(2), two equivalent Mn(3), and four equivalent Ni(2) atoms. In the second Mn site, Mn(2) is bonded in a 9-coordinate geometry to one Ce(2), two equivalent Ce(1), two equivalent Ni(1), and four equivalent Ni(2) atoms. In the third Mn site, Mn(3) is bonded to four equivalent Ce(2), four equivalent Mn(1), and four equivalent Ni(2) atoms to form distorted MnCe4Mn4Ni4 cuboctahedra that share corners with four equivalent Mn(3)Ce4Mn4Ni4 cuboctahedra, corners with four equivalent Ni(1)Ce4Mn4Ni4 cuboctahedra, corners with eight equivalent Ni(2)Ce4Mn5Ni3 cuboctahedra, edges with two equivalent Mn(3)Ce4Mn4Ni4 cuboctahedra, edges with eight equivalent Ni(2)Ce4Mn5Ni3 cuboctahedra, faces with two equivalent Mn(3)Ce4Mn4Ni4 cuboctahedra, and faces with eight equivalent Ni(2)Ce4Mn5Ni3 cuboctahedra. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to four equivalent Ce(1), four equivalent Mn(2), and four equivalent Ni(2) atoms to form distorted NiCe4Mn4Ni4 cuboctahedra that share corners with four equivalent Mn(3)Ce4Mn4Ni4 cuboctahedra, corners with four equivalent Ni(1)Ce4Mn4Ni4 cuboctahedra, corners with eight equivalent Ni(2)Ce4Mn5Ni3 cuboctahedra, edges with two equivalent Ni(1)Ce4Mn4Ni4 cuboctahedra, edges with eight equivalent Ni(2)Ce4Mn5Ni3 cuboctahedra, faces with two equivalent Ni(1)Ce4Mn4Ni4 cuboctahedra, and faces with eight equivalent Ni(2)Ce4Mn5Ni3 cuboctahedra. In the second Ni site, Ni(2) is bonded to two equivalent Ce(1), two equivalent Ce(2), one Mn(3), two equivalent Mn(1), two equivalent Mn(2), one Ni(1), and two equivalent Ni(2) atoms to form distorted NiCe4Mn5Ni3 cuboctahedra that share corners with two equivalent Mn(3)Ce4Mn4Ni4 cuboctahedra, corners with two equivalent Ni(1)Ce4Mn4Ni4 cuboctahedra, corners with twelve equivalent Ni(2)Ce4Mn5Ni3 cuboctahedra, edges with two equivalent Mn(3)Ce4Mn4Ni4 cuboctahedra, edges with two equivalent Ni(1)Ce4Mn4Ni4 cuboctahedra, edges with six equivalent Ni(2)Ce4Mn5Ni3 cuboctahedra, faces with two equivalent Mn(3)Ce4Mn4Ni4 cuboctahedra, faces with two equivalent Ni(1)Ce4Mn4Ni4 cuboctahedra, and faces with six equivalent Ni(2)Ce4Mn5Ni3 cuboctahedra.
Ce2(MnNi)5 crystallizes in the orthorhombic Pmmm space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 18-coordinate geometry to two equivalent Mn(1), four equivalent Mn(2), four equivalent Ni(1), and eight equivalent Ni(2) atoms. Both Ce(1)-Mn(1) bond lengths are 2.99 Å. All Ce(1)-Mn(2) bond lengths are 2.95 Å. All Ce(1)-Ni(1) bond lengths are 3.25 Å. All Ce(1)-Ni(2) bond lengths are 3.25 Å. In the second Ce site, Ce(2) is bonded in a 18-coordinate geometry to two equivalent Mn(2), four equivalent Mn(1), four equivalent Mn(3), and eight equivalent Ni(2) atoms. Both Ce(2)-Mn(2) bond lengths are 2.92 Å. All Ce(2)-Mn(1) bond lengths are 2.92 Å. All Ce(2)-Mn(3) bond lengths are 3.25 Å. All Ce(2)-Ni(2) bond lengths are 3.21 Å. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 9-coordinate geometry to one Ce(1), two equivalent Ce(2), two equivalent Mn(3), and four equivalent Ni(2) atoms. Both Mn(1)-Mn(3) bond lengths are 2.44 Å. All Mn(1)-Ni(2) bond lengths are 2.50 Å. In the second Mn site, Mn(2) is bonded in a 9-coordinate geometry to one Ce(2), two equivalent Ce(1), two equivalent Ni(1), and four equivalent Ni(2) atoms. Both Mn(2)-Ni(1) bond lengths are 2.48 Å. All Mn(2)-Ni(2) bond lengths are 2.49 Å. In the third Mn site, Mn(3) is bonded to four equivalent Ce(2), four equivalent Mn(1), and four equivalent Ni(2) atoms to form distorted MnCe4Mn4Ni4 cuboctahedra that share corners with four equivalent Mn(3)Ce4Mn4Ni4 cuboctahedra, corners with four equivalent Ni(1)Ce4Mn4Ni4 cuboctahedra, corners with eight equivalent Ni(2)Ce4Mn5Ni3 cuboctahedra, edges with two equivalent Mn(3)Ce4Mn4Ni4 cuboctahedra, edges with eight equivalent Ni(2)Ce4Mn5Ni3 cuboctahedra, faces with two equivalent Mn(3)Ce4Mn4Ni4 cuboctahedra, and faces with eight equivalent Ni(2)Ce4Mn5Ni3 cuboctahedra. All Mn(3)-Ni(2) bond lengths are 2.52 Å. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to four equivalent Ce(1), four equivalent Mn(2), and four equivalent Ni(2) atoms to form distorted NiCe4Mn4Ni4 cuboctahedra that share corners with four equivalent Mn(3)Ce4Mn4Ni4 cuboctahedra, corners with four equivalent Ni(1)Ce4Mn4Ni4 cuboctahedra, corners with eight equivalent Ni(2)Ce4Mn5Ni3 cuboctahedra, edges with two equivalent Ni(1)Ce4Mn4Ni4 cuboctahedra, edges with eight equivalent Ni(2)Ce4Mn5Ni3 cuboctahedra, faces with two equivalent Ni(1)Ce4Mn4Ni4 cuboctahedra, and faces with eight equivalent Ni(2)Ce4Mn5Ni3 cuboctahedra. All Ni(1)-Ni(2) bond lengths are 2.55 Å. In the second Ni site, Ni(2) is bonded to two equivalent Ce(1), two equivalent Ce(2), one Mn(3), two equivalent Mn(1), two equivalent Mn(2), one Ni(1), and two equivalent Ni(2) atoms to form distorted NiCe4Mn5Ni3 cuboctahedra that share corners with two equivalent Mn(3)Ce4Mn4Ni4 cuboctahedra, corners with two equivalent Ni(1)Ce4Mn4Ni4 cuboctahedra, corners with twelve equivalent Ni(2)Ce4Mn5Ni3 cuboctahedra, edges with two equivalent Mn(3)Ce4Mn4Ni4 cuboctahedra, edges with two equivalent Ni(1)Ce4Mn4Ni4 cuboctahedra, edges with six equivalent Ni(2)Ce4Mn5Ni3 cuboctahedra, faces with two equivalent Mn(3)Ce4Mn4Ni4 cuboctahedra, faces with two equivalent Ni(1)Ce4Mn4Ni4 cuboctahedra, and faces with six equivalent Ni(2)Ce4Mn5Ni3 cuboctahedra. There is one shorter (2.55 Å) and one longer (2.58 Å) Ni(2)-Ni(2) bond length.