U2Co12P7 crystallizes in the monoclinic Pm space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 18-coordinate geometry to one Co(1), one Co(2), one Co(3), one Co(7), one Co(8), one Co(9), two equivalent Co(4), two equivalent Co(5), two equivalent Co(6), two equivalent P(1), two equivalent P(2), and two equivalent P(3) atoms. In the second U site, U(2) is bonded in a 12-coordinate geometry to two equivalent Co(1), two equivalent Co(2), two equivalent Co(3), two equivalent P(5), two equivalent P(6), and two equivalent P(7) atoms. There are twelve inequivalent Co sites. In the first Co site, Co(1) is bonded to one U(1), two equivalent U(2), one P(5), one P(6), and two equivalent P(3) atoms to form distorted CoU3P4 tetrahedra that share corners with two equivalent Co(7)UP4 tetrahedra, corners with two equivalent Co(9)UP4 tetrahedra, corners with three equivalent Co(2)U3P4 tetrahedra, corners with four equivalent Co(4)U2P4 tetrahedra,  an edgeedge with one Co(8)UP4 tetrahedra, edges with two equivalent Co(6)U2P4 tetrahedra, edges with two equivalent Co(1)U3P4 tetrahedra,  a faceface with one Co(2)U3P4 tetrahedra,  a faceface with one Co(9)UP4 tetrahedra, and faces with two equivalent Co(5)U2P4 tetrahedra. In the second Co site, Co(2) is bonded to one U(1), two equivalent U(2), one P(6), one P(7), and two equivalent P(1) atoms to form distorted CoU3P4 tetrahedra that share corners with two equivalent Co(7)UP4 tetrahedra, corners with two equivalent Co(8)UP4 tetrahedra, corners with three equivalent Co(1)U3P4 tetrahedra, corners with four equivalent Co(5)U2P4 tetrahedra,  an edgeedge with one Co(9)UP4 tetrahedra, edges with two equivalent Co(4)U2P4 tetrahedra, edges with two equivalent Co(2)U3P4 tetrahedra,  a faceface with one Co(1)U3P4 tetrahedra,  a faceface with one Co(7)UP4 tetrahedra, and faces with two equivalent Co(6)U2P4 tetrahedra. In the third Co site, Co(3) is bonded in a 4-coordinate geometry to one U(1), two equivalent U(2), one P(5), one P(7), and two equivalent P(2) atoms. In the fourth Co site, Co(4) is bonded to two equivalent U(1), one P(1), one P(2), and two equivalent P(5) atoms to form distorted CoU2P4 tetrahedra that share corners with two equivalent Co(5)U2P4 tetrahedra, corners with two equivalent Co(6)U2P4 tetrahedra, corners with two equivalent Co(9)UP4 tetrahedra, corners with four equivalent Co(1)U3P4 tetrahedra, edges with two equivalent Co(4)U2P4 tetrahedra, edges with two equivalent Co(2)U3P4 tetrahedra, edges with two equivalent Co(8)UP4 tetrahedra,  a faceface with one Co(5)U2P4 tetrahedra,  a faceface with one Co(6)U2P4 tetrahedra, and faces with two equivalent Co(7)UP4 tetrahedra. In the fifth Co site, Co(5) is bonded to two equivalent U(1), one P(2), one P(3), and two equivalent P(6) atoms to form distorted CoU2P4 tetrahedra that share corners with two equivalent Co(4)U2P4 tetrahedra, corners with two equivalent Co(6)U2P4 tetrahedra, corners with two equivalent Co(7)UP4 tetrahedra, corners with four equivalent Co(2)U3P4 tetrahedra, edges with two equivalent Co(5)U2P4 tetrahedra, edges with two equivalent Co(9)UP4 tetrahedra,  a faceface with one Co(4)U2P4 tetrahedra,  a faceface with one Co(6)U2P4 tetrahedra, faces with two equivalent Co(1)U3P4 tetrahedra, and faces with two equivalent Co(8)UP4 tetrahedra. In the sixth Co site, Co(6) is bonded to two equivalent U(1), one P(1), one P(3), and two equivalent P(7) atoms to form distorted CoU2P4 tetrahedra that share corners with two equivalent Co(4)U2P4 tetrahedra, corners with two equivalent Co(5)U2P4 tetrahedra, corners with two equivalent Co(8)UP4 tetrahedra, edges with two equivalent Co(6)U2P4 tetrahedra, edges with two equivalent Co(1)U3P4 tetrahedra, edges with two equivalent Co(7)UP4 tetrahedra,  a faceface with one Co(4)U2P4 tetrahedra,  a faceface with one Co(5)U2P4 tetrahedra, faces with two equivalent Co(2)U3P4 tetrahedra, and faces with two equivalent Co(9)UP4 tetrahedra. In the seventh Co site, Co(7) is bonded to one U(1), one P(4), one P(5), and two equivalent P(1) atoms to form distorted CoUP4 tetrahedra that share corners with two equivalent Co(5)U2P4 tetrahedra, corners with two equivalent Co(1)U3P4 tetrahedra, corners with two equivalent Co(2)U3P4 tetrahedra, corners with two equivalent Co(7)UP4 tetrahedra, corners with two equivalent Co(8)UP4 tetrahedra, corners with two equivalent Co(9)UP4 tetrahedra, edges with two equivalent Co(6)U2P4 tetrahedra,  a faceface with one Co(2)U3P4 tetrahedra, and faces with two equivalent Co(4)U2P4 tetrahedra. In the eighth Co site, Co(8) is bonded to one U(1), one P(4), one P(6), and two equivalent P(2) atoms to form distorted CoUP4 tetrahedra that share corners with two equivalent Co(6)U2P4 tetrahedra, corners with two equivalent Co(2)U3P4 tetrahedra, corners with two equivalent Co(7)UP4 tetrahedra, corners with two equivalent Co(8)UP4 tetrahedra, corners with two equivalent Co(9)UP4 tetrahedra,  an edgeedge with one Co(1)U3P4 tetrahedra, edges with two equivalent Co(4)U2P4 tetrahedra, and faces with two equivalent Co(5)U2P4 tetrahedra. In the ninth Co site, Co(9) is bonded to one U(1), one P(4), one P(7), and two equivalent P(3) atoms to form distorted CoUP4 tetrahedra that share corners with two equivalent Co(4)U2P4 tetrahedra, corners with two equivalent Co(1)U3P4 tetrahedra, corners with two equivalent Co(7)UP4 tetrahedra, corners with two equivalent Co(8)UP4 tetrahedra, corners with two equivalent Co(9)UP4 tetrahedra,  an edgeedge with one Co(2)U3P4 tetrahedra, edges with two equivalent Co(5)U2P4 tetrahedra,  a faceface with one Co(1)U3P4 tetrahedra, and faces with two equivalent Co(6)U2P4 tetrahedra. In the tenth Co site, Co(10) is bonded in a 5-coordinate geometry to one P(3), two equivalent P(4), and two equivalent P(5) atoms. In the eleventh Co site, Co(11) is bonded in a 5-coordinate geometry to one P(1), two equivalent P(4), and two equivalent P(6) atoms. In the twelfth Co site, Co(12) is bonded in a 5-coordinate geometry to one P(2), two equivalent P(4), and two equivalent P(7) atoms. There are seven inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to two equivalent U(1), one Co(11), one Co(4), one Co(6), two equivalent Co(2), and two equivalent Co(7) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to two equivalent U(1), one Co(12), one Co(4), one Co(5), two equivalent Co(3), and two equivalent Co(8) atoms. In the third P site, P(3) is bonded in a 9-coordinate geometry to two equivalent U(1), one Co(10), one Co(5), one Co(6), two equivalent Co(1), and two equivalent Co(9) atoms. In the fourth P site, P(4) is bonded in a 9-coordinate geometry to one Co(7), one Co(8), one Co(9), two equivalent Co(10), two equivalent Co(11), and two equivalent Co(12) atoms. In the fifth P site, P(5) is bonded in a 9-coordinate geometry to two equivalent U(2), one Co(1), one Co(3), one Co(7), two equivalent Co(10), and two equivalent Co(4) atoms. In the sixth P site, P(6) is bonded in a 9-coordinate geometry to two equivalent U(2), one Co(1), one Co(2), one Co(8), two equivalent Co(11), and two equivalent Co(5) atoms. In the seventh P site, P(7) is bonded in a 9-coordinate geometry to two equivalent U(2), one Co(2), one Co(3), one Co(9), two equivalent Co(12), and two equivalent Co(6) atoms.
U2Co12P7 crystallizes in the monoclinic Pm space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 18-coordinate geometry to one Co(1), one Co(2), one Co(3), one Co(7), one Co(8), one Co(9), two equivalent Co(4), two equivalent Co(5), two equivalent Co(6), two equivalent P(1), two equivalent P(2), and two equivalent P(3) atoms. The U(1)-Co(1) bond length is 3.18 Å. The U(1)-Co(2) bond length is 3.18 Å. The U(1)-Co(3) bond length is 3.19 Å. The U(1)-Co(7) bond length is 3.07 Å. The U(1)-Co(8) bond length is 3.06 Å. The U(1)-Co(9) bond length is 3.07 Å. Both U(1)-Co(4) bond lengths are 2.92 Å. Both U(1)-Co(5) bond lengths are 2.91 Å. Both U(1)-Co(6) bond lengths are 2.91 Å. Both U(1)-P(1) bond lengths are 2.89 Å. Both U(1)-P(2) bond lengths are 2.89 Å. Both U(1)-P(3) bond lengths are 2.88 Å. In the second U site, U(2) is bonded in a 12-coordinate geometry to two equivalent Co(1), two equivalent Co(2), two equivalent Co(3), two equivalent P(5), two equivalent P(6), and two equivalent P(7) atoms. Both U(2)-Co(1) bond lengths are 2.90 Å. Both U(2)-Co(2) bond lengths are 2.92 Å. Both U(2)-Co(3) bond lengths are 2.89 Å. Both U(2)-P(5) bond lengths are 2.87 Å. Both U(2)-P(6) bond lengths are 2.84 Å. Both U(2)-P(7) bond lengths are 2.84 Å. There are twelve inequivalent Co sites. In the first Co site, Co(1) is bonded to one U(1), two equivalent U(2), one P(5), one P(6), and two equivalent P(3) atoms to form distorted CoU3P4 tetrahedra that share corners with two equivalent Co(7)UP4 tetrahedra, corners with two equivalent Co(9)UP4 tetrahedra, corners with three equivalent Co(2)U3P4 tetrahedra, corners with four equivalent Co(4)U2P4 tetrahedra,  an edgeedge with one Co(8)UP4 tetrahedra, edges with two equivalent Co(6)U2P4 tetrahedra, edges with two equivalent Co(1)U3P4 tetrahedra,  a faceface with one Co(2)U3P4 tetrahedra,  a faceface with one Co(9)UP4 tetrahedra, and faces with two equivalent Co(5)U2P4 tetrahedra. The Co(1)-P(5) bond length is 2.24 Å. The Co(1)-P(6) bond length is 2.24 Å. Both Co(1)-P(3) bond lengths are 2.28 Å. In the second Co site, Co(2) is bonded to one U(1), two equivalent U(2), one P(6), one P(7), and two equivalent P(1) atoms to form distorted CoU3P4 tetrahedra that share corners with two equivalent Co(7)UP4 tetrahedra, corners with two equivalent Co(8)UP4 tetrahedra, corners with three equivalent Co(1)U3P4 tetrahedra, corners with four equivalent Co(5)U2P4 tetrahedra,  an edgeedge with one Co(9)UP4 tetrahedra, edges with two equivalent Co(4)U2P4 tetrahedra, edges with two equivalent Co(2)U3P4 tetrahedra,  a faceface with one Co(1)U3P4 tetrahedra,  a faceface with one Co(7)UP4 tetrahedra, and faces with two equivalent Co(6)U2P4 tetrahedra. The Co(2)-P(6) bond length is 2.25 Å. The Co(2)-P(7) bond length is 2.23 Å. Both Co(2)-P(1) bond lengths are 2.28 Å. In the third Co site, Co(3) is bonded in a 4-coordinate geometry to one U(1), two equivalent U(2), one P(5), one P(7), and two equivalent P(2) atoms. The Co(3)-P(5) bond length is 2.23 Å. The Co(3)-P(7) bond length is 2.26 Å. Both Co(3)-P(2) bond lengths are 2.29 Å. In the fourth Co site, Co(4) is bonded to two equivalent U(1), one P(1), one P(2), and two equivalent P(5) atoms to form distorted CoU2P4 tetrahedra that share corners with two equivalent Co(5)U2P4 tetrahedra, corners with two equivalent Co(6)U2P4 tetrahedra, corners with two equivalent Co(9)UP4 tetrahedra, corners with four equivalent Co(1)U3P4 tetrahedra, edges with two equivalent Co(4)U2P4 tetrahedra, edges with two equivalent Co(2)U3P4 tetrahedra, edges with two equivalent Co(8)UP4 tetrahedra,  a faceface with one Co(5)U2P4 tetrahedra,  a faceface with one Co(6)U2P4 tetrahedra, and faces with two equivalent Co(7)UP4 tetrahedra. The Co(4)-P(1) bond length is 2.31 Å. The Co(4)-P(2) bond length is 2.23 Å. Both Co(4)-P(5) bond lengths are 2.27 Å. In the fifth Co site, Co(5) is bonded to two equivalent U(1), one P(2), one P(3), and two equivalent P(6) atoms to form distorted CoU2P4 tetrahedra that share corners with two equivalent Co(4)U2P4 tetrahedra, corners with two equivalent Co(6)U2P4 tetrahedra, corners with two equivalent Co(7)UP4 tetrahedra, corners with four equivalent Co(2)U3P4 tetrahedra, edges with two equivalent Co(5)U2P4 tetrahedra, edges with two equivalent Co(9)UP4 tetrahedra,  a faceface with one Co(4)U2P4 tetrahedra,  a faceface with one Co(6)U2P4 tetrahedra, faces with two equivalent Co(1)U3P4 tetrahedra, and faces with two equivalent Co(8)UP4 tetrahedra. The Co(5)-P(2) bond length is 2.31 Å. The Co(5)-P(3) bond length is 2.23 Å. Both Co(5)-P(6) bond lengths are 2.28 Å. In the sixth Co site, Co(6) is bonded to two equivalent U(1), one P(1), one P(3), and two equivalent P(7) atoms to form distorted CoU2P4 tetrahedra that share corners with two equivalent Co(4)U2P4 tetrahedra, corners with two equivalent Co(5)U2P4 tetrahedra, corners with two equivalent Co(8)UP4 tetrahedra, edges with two equivalent Co(6)U2P4 tetrahedra, edges with two equivalent Co(1)U3P4 tetrahedra, edges with two equivalent Co(7)UP4 tetrahedra,  a faceface with one Co(4)U2P4 tetrahedra,  a faceface with one Co(5)U2P4 tetrahedra, faces with two equivalent Co(2)U3P4 tetrahedra, and faces with two equivalent Co(9)UP4 tetrahedra. The Co(6)-P(1) bond length is 2.23 Å. The Co(6)-P(3) bond length is 2.30 Å. Both Co(6)-P(7) bond lengths are 2.29 Å. In the seventh Co site, Co(7) is bonded to one U(1), one P(4), one P(5), and two equivalent P(1) atoms to form distorted CoUP4 tetrahedra that share corners with two equivalent Co(5)U2P4 tetrahedra, corners with two equivalent Co(1)U3P4 tetrahedra, corners with two equivalent Co(2)U3P4 tetrahedra, corners with two equivalent Co(7)UP4 tetrahedra, corners with two equivalent Co(8)UP4 tetrahedra, corners with two equivalent Co(9)UP4 tetrahedra, edges with two equivalent Co(6)U2P4 tetrahedra,  a faceface with one Co(2)U3P4 tetrahedra, and faces with two equivalent Co(4)U2P4 tetrahedra. The Co(7)-P(4) bond length is 2.11 Å. The Co(7)-P(5) bond length is 2.17 Å. Both Co(7)-P(1) bond lengths are 2.27 Å. In the eighth Co site, Co(8) is bonded to one U(1), one P(4), one P(6), and two equivalent P(2) atoms to form distorted CoUP4 tetrahedra that share corners with two equivalent Co(6)U2P4 tetrahedra, corners with two equivalent Co(2)U3P4 tetrahedra, corners with two equivalent Co(7)UP4 tetrahedra, corners with two equivalent Co(8)UP4 tetrahedra, corners with two equivalent Co(9)UP4 tetrahedra,  an edgeedge with one Co(1)U3P4 tetrahedra, edges with two equivalent Co(4)U2P4 tetrahedra, and faces with two equivalent Co(5)U2P4 tetrahedra. The Co(8)-P(4) bond length is 2.11 Å. The Co(8)-P(6) bond length is 2.19 Å. Both Co(8)-P(2) bond lengths are 2.27 Å. In the ninth Co site, Co(9) is bonded to one U(1), one P(4), one P(7), and two equivalent P(3) atoms to form distorted CoUP4 tetrahedra that share corners with two equivalent Co(4)U2P4 tetrahedra, corners with two equivalent Co(1)U3P4 tetrahedra, corners with two equivalent Co(7)UP4 tetrahedra, corners with two equivalent Co(8)UP4 tetrahedra, corners with two equivalent Co(9)UP4 tetrahedra,  an edgeedge with one Co(2)U3P4 tetrahedra, edges with two equivalent Co(5)U2P4 tetrahedra,  a faceface with one Co(1)U3P4 tetrahedra, and faces with two equivalent Co(6)U2P4 tetrahedra. The Co(9)-P(4) bond length is 2.11 Å. The Co(9)-P(7) bond length is 2.19 Å. Both Co(9)-P(3) bond lengths are 2.28 Å. In the tenth Co site, Co(10) is bonded in a 5-coordinate geometry to one P(3), two equivalent P(4), and two equivalent P(5) atoms. The Co(10)-P(3) bond length is 2.22 Å. Both Co(10)-P(4) bond lengths are 2.57 Å. Both Co(10)-P(5) bond lengths are 2.42 Å. In the eleventh Co site, Co(11) is bonded in a 5-coordinate geometry to one P(1), two equivalent P(4), and two equivalent P(6) atoms. The Co(11)-P(1) bond length is 2.22 Å. Both Co(11)-P(4) bond lengths are 2.56 Å. Both Co(11)-P(6) bond lengths are 2.43 Å. In the twelfth Co site, Co(12) is bonded in a 5-coordinate geometry to one P(2), two equivalent P(4), and two equivalent P(7) atoms. The Co(12)-P(2) bond length is 2.22 Å. Both Co(12)-P(4) bond lengths are 2.56 Å. Both Co(12)-P(7) bond lengths are 2.43 Å. There are seven inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to two equivalent U(1), one Co(11), one Co(4), one Co(6), two equivalent Co(2), and two equivalent Co(7) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to two equivalent U(1), one Co(12), one Co(4), one Co(5), two equivalent Co(3), and two equivalent Co(8) atoms. In the third P site, P(3) is bonded in a 9-coordinate geometry to two equivalent U(1), one Co(10), one Co(5), one Co(6), two equivalent Co(1), and two equivalent Co(9) atoms. In the fourth P site, P(4) is bonded in a 9-coordinate geometry to one Co(7), one Co(8), one Co(9), two equivalent Co(10), two equivalent Co(11), and two equivalent Co(12) atoms. In the fifth P site, P(5) is bonded in a 9-coordinate geometry to two equivalent U(2), one Co(1), one Co(3), one Co(7), two equivalent Co(10), and two equivalent Co(4) atoms. In the sixth P site, P(6) is bonded in a 9-coordinate geometry to two equivalent U(2), one Co(1), one Co(2), one Co(8), two equivalent Co(11), and two equivalent Co(5) atoms. In the seventh P site, P(7) is bonded in a 9-coordinate geometry to two equivalent U(2), one Co(2), one Co(3), one Co(9), two equivalent Co(12), and two equivalent Co(6) atoms.