U2Cu2As3O crystallizes in the tetragonal P4/nmm space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 8-coordinate geometry to four equivalent As(2) and four equivalent As(3) atoms. In the second U site, U(2) is bonded in a 4-coordinate geometry to four equivalent As(1) and four equivalent O(1) atoms. Cu(1) is bonded to two equivalent As(1) and two equivalent As(2) atoms to form a mixture of distorted corner and edge-sharing CuAs4 tetrahedra. There are three inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to four equivalent U(2) and four equivalent Cu(1) atoms. In the second As site, As(2) is bonded in a 8-coordinate geometry to four equivalent U(1) and four equivalent Cu(1) atoms. In the third As site, As(3) is bonded in a 8-coordinate geometry to four equivalent U(1) and four equivalent As(3) atoms. O(1) is bonded to four equivalent U(2) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra.
U2Cu2As3O crystallizes in the tetragonal P4/nmm space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 8-coordinate geometry to four equivalent As(2) and four equivalent As(3) atoms. All U(1)-As(2) bond lengths are 2.91 Å. All U(1)-As(3) bond lengths are 2.99 Å. In the second U site, U(2) is bonded in a 4-coordinate geometry to four equivalent As(1) and four equivalent O(1) atoms. All U(2)-As(1) bond lengths are 3.10 Å. All U(2)-O(1) bond lengths are 2.33 Å. Cu(1) is bonded to two equivalent As(1) and two equivalent As(2) atoms to form a mixture of distorted corner and edge-sharing CuAs4 tetrahedra. Both Cu(1)-As(1) bond lengths are 2.45 Å. Both Cu(1)-As(2) bond lengths are 2.56 Å. There are three inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to four equivalent U(2) and four equivalent Cu(1) atoms. In the second As site, As(2) is bonded in a 8-coordinate geometry to four equivalent U(1) and four equivalent Cu(1) atoms. In the third As site, As(3) is bonded in a 8-coordinate geometry to four equivalent U(1) and four equivalent As(3) atoms. All As(3)-As(3) bond lengths are 2.76 Å. O(1) is bonded to four equivalent U(2) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra.