U2Cr30P19 crystallizes in the hexagonal P-6 space group. There are two inequivalent U sites. In the first U site, U(1) is bonded to six equivalent Cr(1) and six equivalent P(5) atoms to form distorted UCr6P6 cuboctahedra that share edges with six equivalent Cr(1)U2P4 tetrahedra and faces with two equivalent U(1)Cr6P6 cuboctahedra. In the second U site, U(2) is bonded to six equivalent Cr(6) and six equivalent P(4) atoms to form distorted UCr6P6 cuboctahedra that share edges with six equivalent Cr(6)U2P4 tetrahedra and faces with two equivalent U(2)Cr6P6 cuboctahedra. There are ten inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to two equivalent U(1), two equivalent P(5), and two equivalent P(6) atoms to form distorted CrU2P4 tetrahedra that share corners with four equivalent Cr(1)U2P4 tetrahedra, edges with two equivalent U(1)Cr6P6 cuboctahedra, edges with two equivalent Cr(1)U2P4 tetrahedra, and faces with two equivalent Cr(1)U2P4 tetrahedra. In the second Cr site, Cr(2) is bonded in a 5-coordinate geometry to one P(7), two equivalent P(2), and two equivalent P(4) atoms. In the third Cr site, Cr(3) is bonded in a 5-coordinate geometry to one P(6), two equivalent P(3), and two equivalent P(5) atoms. In the fourth Cr site, Cr(4) is bonded to one P(1), one P(3), and two equivalent P(2) atoms to form distorted corner-sharing CrP4 tetrahedra. In the fifth Cr site, Cr(5) is bonded in a 5-coordinate geometry to one P(2), two equivalent P(1), and two equivalent P(3) atoms. In the sixth Cr site, Cr(6) is bonded to two equivalent U(2), two equivalent P(4), and two equivalent P(7) atoms to form distorted CrU2P4 tetrahedra that share corners with four equivalent Cr(6)U2P4 tetrahedra, edges with two equivalent U(2)Cr6P6 cuboctahedra, edges with two equivalent Cr(6)U2P4 tetrahedra, and faces with two equivalent Cr(6)U2P4 tetrahedra. In the seventh Cr site, Cr(7) is bonded in a 5-coordinate geometry to one P(6), two equivalent P(5), and two equivalent P(7) atoms. In the eighth Cr site, Cr(8) is bonded in a 5-coordinate geometry to one P(7), two equivalent P(4), and two equivalent P(6) atoms. In the ninth Cr site, Cr(9) is bonded in a 5-coordinate geometry to one P(3), two equivalent P(2), and two equivalent P(6) atoms. In the tenth Cr site, Cr(10) is bonded in a 5-coordinate geometry to one P(2), two equivalent P(3), 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 three equivalent Cr(4) and six equivalent Cr(5) atoms. In the second P site, P(2) is bonded in a 8-coordinate geometry to one Cr(10), one Cr(5), two equivalent Cr(2), two equivalent Cr(4), and two equivalent Cr(9) atoms. In the third P site, P(3) is bonded in a 8-coordinate geometry to one Cr(4), one Cr(9), two equivalent Cr(10), two equivalent Cr(3), and two equivalent Cr(5) atoms. In the fourth P site, P(4) is bonded in a 8-coordinate geometry to two equivalent U(2), two equivalent Cr(2), two equivalent Cr(6), and two equivalent Cr(8) atoms. In the fifth P site, P(5) is bonded in a 8-coordinate geometry to two equivalent U(1), two equivalent Cr(1), two equivalent Cr(3), and two equivalent Cr(7) atoms. In the sixth P site, P(6) is bonded in a 8-coordinate geometry to one Cr(3), one Cr(7), two equivalent Cr(1), two equivalent Cr(8), and two equivalent Cr(9) atoms. In the seventh P site, P(7) is bonded in a 8-coordinate geometry to one Cr(2), one Cr(8), two equivalent Cr(10), two equivalent Cr(6), and two equivalent Cr(7) atoms.
U2Cr30P19 crystallizes in the hexagonal P-6 space group. There are two inequivalent U sites. In the first U site, U(1) is bonded to six equivalent Cr(1) and six equivalent P(5) atoms to form distorted UCr6P6 cuboctahedra that share edges with six equivalent Cr(1)U2P4 tetrahedra and faces with two equivalent U(1)Cr6P6 cuboctahedra. All U(1)-Cr(1) bond lengths are 2.97 Å. All U(1)-P(5) bond lengths are 2.83 Å. In the second U site, U(2) is bonded to six equivalent Cr(6) and six equivalent P(4) atoms to form distorted UCr6P6 cuboctahedra that share edges with six equivalent Cr(6)U2P4 tetrahedra and faces with two equivalent U(2)Cr6P6 cuboctahedra. All U(2)-Cr(6) bond lengths are 2.98 Å. All U(2)-P(4) bond lengths are 2.83 Å. There are ten inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to two equivalent U(1), two equivalent P(5), and two equivalent P(6) atoms to form distorted CrU2P4 tetrahedra that share corners with four equivalent Cr(1)U2P4 tetrahedra, edges with two equivalent U(1)Cr6P6 cuboctahedra, edges with two equivalent Cr(1)U2P4 tetrahedra, and faces with two equivalent Cr(1)U2P4 tetrahedra. There is one shorter (2.34 Å) and one longer (2.35 Å) Cr(1)-P(5) bond length. Both Cr(1)-P(6) bond lengths are 2.30 Å. In the second Cr site, Cr(2) is bonded in a 5-coordinate geometry to one P(7), two equivalent P(2), and two equivalent P(4) atoms. The Cr(2)-P(7) bond length is 2.42 Å. Both Cr(2)-P(2) bond lengths are 2.37 Å. Both Cr(2)-P(4) bond lengths are 2.38 Å. In the third Cr site, Cr(3) is bonded in a 5-coordinate geometry to one P(6), two equivalent P(3), and two equivalent P(5) atoms. The Cr(3)-P(6) bond length is 2.41 Å. Both Cr(3)-P(3) bond lengths are 2.36 Å. Both Cr(3)-P(5) bond lengths are 2.38 Å. In the fourth Cr site, Cr(4) is bonded to one P(1), one P(3), and two equivalent P(2) atoms to form distorted corner-sharing CrP4 tetrahedra. The Cr(4)-P(1) bond length is 2.30 Å. The Cr(4)-P(3) bond length is 2.34 Å. Both Cr(4)-P(2) bond lengths are 2.28 Å. In the fifth Cr site, Cr(5) is bonded in a 5-coordinate geometry to one P(2), two equivalent P(1), and two equivalent P(3) atoms. The Cr(5)-P(2) bond length is 2.48 Å. Both Cr(5)-P(1) bond lengths are 2.50 Å. Both Cr(5)-P(3) bond lengths are 2.47 Å. In the sixth Cr site, Cr(6) is bonded to two equivalent U(2), two equivalent P(4), and two equivalent P(7) atoms to form distorted CrU2P4 tetrahedra that share corners with four equivalent Cr(6)U2P4 tetrahedra, edges with two equivalent U(2)Cr6P6 cuboctahedra, edges with two equivalent Cr(6)U2P4 tetrahedra, and faces with two equivalent Cr(6)U2P4 tetrahedra. There is one shorter (2.34 Å) and one longer (2.35 Å) Cr(6)-P(4) bond length. Both Cr(6)-P(7) bond lengths are 2.30 Å. In the seventh Cr site, Cr(7) is bonded in a 5-coordinate geometry to one P(6), two equivalent P(5), and two equivalent P(7) atoms. The Cr(7)-P(6) bond length is 2.43 Å. Both Cr(7)-P(5) bond lengths are 2.38 Å. Both Cr(7)-P(7) bond lengths are 2.37 Å. In the eighth Cr site, Cr(8) is bonded in a 5-coordinate geometry to one P(7), two equivalent P(4), and two equivalent P(6) atoms. The Cr(8)-P(7) bond length is 2.42 Å. Both Cr(8)-P(4) bond lengths are 2.38 Å. Both Cr(8)-P(6) bond lengths are 2.39 Å. In the ninth Cr site, Cr(9) is bonded in a 5-coordinate geometry to one P(3), two equivalent P(2), and two equivalent P(6) atoms. The Cr(9)-P(3) bond length is 2.35 Å. Both Cr(9)-P(2) bond lengths are 2.34 Å. Both Cr(9)-P(6) bond lengths are 2.39 Å. In the tenth Cr site, Cr(10) is bonded in a 5-coordinate geometry to one P(2), two equivalent P(3), and two equivalent P(7) atoms. The Cr(10)-P(2) bond length is 2.46 Å. Both Cr(10)-P(3) bond lengths are 2.39 Å. Both Cr(10)-P(7) bond lengths are 2.39 Å. There are seven inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to three equivalent Cr(4) and six equivalent Cr(5) atoms. In the second P site, P(2) is bonded in a 8-coordinate geometry to one Cr(10), one Cr(5), two equivalent Cr(2), two equivalent Cr(4), and two equivalent Cr(9) atoms. In the third P site, P(3) is bonded in a 8-coordinate geometry to one Cr(4), one Cr(9), two equivalent Cr(10), two equivalent Cr(3), and two equivalent Cr(5) atoms. In the fourth P site, P(4) is bonded in a 8-coordinate geometry to two equivalent U(2), two equivalent Cr(2), two equivalent Cr(6), and two equivalent Cr(8) atoms. In the fifth P site, P(5) is bonded in a 8-coordinate geometry to two equivalent U(1), two equivalent Cr(1), two equivalent Cr(3), and two equivalent Cr(7) atoms. In the sixth P site, P(6) is bonded in a 8-coordinate geometry to one Cr(3), one Cr(7), two equivalent Cr(1), two equivalent Cr(8), and two equivalent Cr(9) atoms. In the seventh P site, P(7) is bonded in a 8-coordinate geometry to one Cr(2), one Cr(8), two equivalent Cr(10), two equivalent Cr(6), and two equivalent Cr(7) atoms.