YReFe6Co5 crystallizes in the orthorhombic Imm2 space group. Y(1) is bonded in a 20-coordinate geometry to one Re(1), two equivalent Fe(2), two equivalent Fe(3), eight equivalent Fe(1), one Co(2), two equivalent Co(1), and four equivalent Co(3) atoms. Re(1) is bonded in a 14-coordinate geometry to one Y(1), two equivalent Fe(2), four equivalent Fe(1), one Co(2), two equivalent Co(3), and four equivalent Co(1) atoms. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent Y(1), one Re(1), one Fe(2), one Fe(3), two equivalent Fe(1), one Co(2), two equivalent Co(1), and two equivalent Co(3) atoms to form distorted FeY2Fe4Co5Re cuboctahedra that share corners with two equivalent Fe(2)Y2Fe4Co4Re2 cuboctahedra, corners with two equivalent Fe(3)Y2Fe4Co6 cuboctahedra, corners with ten equivalent Fe(1)Y2Fe4Co5Re cuboctahedra,  an edgeedge with one Fe(2)Y2Fe4Co4Re2 cuboctahedra,  an edgeedge with one Fe(3)Y2Fe4Co6 cuboctahedra, edges with four equivalent Fe(1)Y2Fe4Co5Re cuboctahedra, faces with two equivalent Fe(2)Y2Fe4Co4Re2 cuboctahedra, faces with two equivalent Fe(3)Y2Fe4Co6 cuboctahedra, and faces with six equivalent Fe(1)Y2Fe4Co5Re cuboctahedra. In the second Fe site, Fe(2) is bonded to two equivalent Y(1), two equivalent Re(1), four equivalent Fe(1), two equivalent Co(1), and two equivalent Co(3) atoms to form distorted FeY2Fe4Co4Re2 cuboctahedra that share corners with six equivalent Fe(3)Y2Fe4Co6 cuboctahedra, corners with eight equivalent Fe(1)Y2Fe4Co5Re cuboctahedra,  an edgeedge with one Fe(3)Y2Fe4Co6 cuboctahedra, edges with two equivalent Fe(2)Y2Fe4Co4Re2 cuboctahedra, edges with four equivalent Fe(1)Y2Fe4Co5Re cuboctahedra,  a faceface with one Fe(3)Y2Fe4Co6 cuboctahedra, and faces with eight equivalent Fe(1)Y2Fe4Co5Re cuboctahedra. In the third Fe site, Fe(3) is bonded to two equivalent Y(1), four equivalent Fe(1), two equivalent Co(1), two equivalent Co(2), and two equivalent Co(3) atoms to form distorted FeY2Fe4Co6 cuboctahedra that share corners with six equivalent Fe(2)Y2Fe4Co4Re2 cuboctahedra, corners with eight equivalent Fe(1)Y2Fe4Co5Re cuboctahedra,  an edgeedge with one Fe(2)Y2Fe4Co4Re2 cuboctahedra, edges with two equivalent Fe(3)Y2Fe4Co6 cuboctahedra, edges with four equivalent Fe(1)Y2Fe4Co5Re cuboctahedra,  a faceface with one Fe(2)Y2Fe4Co4Re2 cuboctahedra, and faces with eight equivalent Fe(1)Y2Fe4Co5Re cuboctahedra. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded in a 14-coordinate geometry to one Y(1), two equivalent Re(1), one Fe(2), one Fe(3), four equivalent Fe(1), one Co(1), two equivalent Co(2), and two equivalent Co(3) atoms. In the second Co site, Co(2) is bonded in a 14-coordinate geometry to one Y(1), one Re(1), two equivalent Fe(3), four equivalent Fe(1), two equivalent Co(3), and four equivalent Co(1) atoms. In the third Co site, Co(3) is bonded in a 12-coordinate geometry to two equivalent Y(1), one Re(1), one Fe(2), one Fe(3), four equivalent Fe(1), one Co(2), and two equivalent Co(1) atoms.
YReFe6Co5 crystallizes in the orthorhombic Imm2 space group. Y(1) is bonded in a 20-coordinate geometry to one Re(1), two equivalent Fe(2), two equivalent Fe(3), eight equivalent Fe(1), one Co(2), two equivalent Co(1), and four equivalent Co(3) atoms. The Y(1)-Re(1) bond length is 3.09 Å. Both Y(1)-Fe(2) bond lengths are 3.03 Å. Both Y(1)-Fe(3) bond lengths are 3.00 Å. There are four shorter (3.18 Å) and four longer (3.22 Å) Y(1)-Fe(1) bond lengths. The Y(1)-Co(2) bond length is 2.98 Å. Both Y(1)-Co(1) bond lengths are 3.02 Å. All Y(1)-Co(3) bond lengths are 3.01 Å. Re(1) is bonded in a 14-coordinate geometry to one Y(1), two equivalent Fe(2), four equivalent Fe(1), one Co(2), two equivalent Co(3), and four equivalent Co(1) atoms. Both Re(1)-Fe(2) bond lengths are 2.60 Å. All Re(1)-Fe(1) bond lengths are 2.59 Å. The Re(1)-Co(2) bond length is 2.39 Å. Both Re(1)-Co(3) bond lengths are 2.58 Å. All Re(1)-Co(1) bond lengths are 2.87 Å. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent Y(1), one Re(1), one Fe(2), one Fe(3), two equivalent Fe(1), one Co(2), two equivalent Co(1), and two equivalent Co(3) atoms to form distorted FeY2Fe4Co5Re cuboctahedra that share corners with two equivalent Fe(2)Y2Fe4Co4Re2 cuboctahedra, corners with two equivalent Fe(3)Y2Fe4Co6 cuboctahedra, corners with ten equivalent Fe(1)Y2Fe4Co5Re cuboctahedra,  an edgeedge with one Fe(2)Y2Fe4Co4Re2 cuboctahedra,  an edgeedge with one Fe(3)Y2Fe4Co6 cuboctahedra, edges with four equivalent Fe(1)Y2Fe4Co5Re cuboctahedra, faces with two equivalent Fe(2)Y2Fe4Co4Re2 cuboctahedra, faces with two equivalent Fe(3)Y2Fe4Co6 cuboctahedra, and faces with six equivalent Fe(1)Y2Fe4Co5Re cuboctahedra. The Fe(1)-Fe(2) bond length is 2.42 Å. The Fe(1)-Fe(3) bond length is 2.40 Å. There is one shorter (2.33 Å) and one longer (2.34 Å) Fe(1)-Fe(1) bond length. The Fe(1)-Co(2) bond length is 2.55 Å. There is one shorter (2.56 Å) and one longer (2.60 Å) Fe(1)-Co(1) bond length. There is one shorter (2.41 Å) and one longer (2.44 Å) Fe(1)-Co(3) bond length. In the second Fe site, Fe(2) is bonded to two equivalent Y(1), two equivalent Re(1), four equivalent Fe(1), two equivalent Co(1), and two equivalent Co(3) atoms to form distorted FeY2Fe4Co4Re2 cuboctahedra that share corners with six equivalent Fe(3)Y2Fe4Co6 cuboctahedra, corners with eight equivalent Fe(1)Y2Fe4Co5Re cuboctahedra,  an edgeedge with one Fe(3)Y2Fe4Co6 cuboctahedra, edges with two equivalent Fe(2)Y2Fe4Co4Re2 cuboctahedra, edges with four equivalent Fe(1)Y2Fe4Co5Re cuboctahedra,  a faceface with one Fe(3)Y2Fe4Co6 cuboctahedra, and faces with eight equivalent Fe(1)Y2Fe4Co5Re cuboctahedra. Both Fe(2)-Co(1) bond lengths are 2.62 Å. Both Fe(2)-Co(3) bond lengths are 2.69 Å. In the third Fe site, Fe(3) is bonded to two equivalent Y(1), four equivalent Fe(1), two equivalent Co(1), two equivalent Co(2), and two equivalent Co(3) atoms to form distorted FeY2Fe4Co6 cuboctahedra that share corners with six equivalent Fe(2)Y2Fe4Co4Re2 cuboctahedra, corners with eight equivalent Fe(1)Y2Fe4Co5Re cuboctahedra,  an edgeedge with one Fe(2)Y2Fe4Co4Re2 cuboctahedra, edges with two equivalent Fe(3)Y2Fe4Co6 cuboctahedra, edges with four equivalent Fe(1)Y2Fe4Co5Re cuboctahedra,  a faceface with one Fe(2)Y2Fe4Co4Re2 cuboctahedra, and faces with eight equivalent Fe(1)Y2Fe4Co5Re cuboctahedra. Both Fe(3)-Co(1) bond lengths are 2.58 Å. Both Fe(3)-Co(2) bond lengths are 2.58 Å. Both Fe(3)-Co(3) bond lengths are 2.71 Å. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded in a 14-coordinate geometry to one Y(1), two equivalent Re(1), one Fe(2), one Fe(3), four equivalent Fe(1), one Co(1), two equivalent Co(2), and two equivalent Co(3) atoms. The Co(1)-Co(1) bond length is 2.36 Å. Both Co(1)-Co(2) bond lengths are 2.88 Å. Both Co(1)-Co(3) bond lengths are 2.59 Å. In the second Co site, Co(2) is bonded in a 14-coordinate geometry to one Y(1), one Re(1), two equivalent Fe(3), four equivalent Fe(1), two equivalent Co(3), and four equivalent Co(1) atoms. Both Co(2)-Co(3) bond lengths are 2.59 Å. In the third Co site, Co(3) is bonded in a 12-coordinate geometry to two equivalent Y(1), one Re(1), one Fe(2), one Fe(3), four equivalent Fe(1), one Co(2), and two equivalent Co(1) atoms.