UCuAs2 is Parent of FeAs superconductors-derived structured and crystallizes in the tetragonal P4/nmm space group. U(1) is bonded to four equivalent Cu(1), four equivalent As(1), and four equivalent As(2) atoms to form distorted UCu4As8 cuboctahedra that share corners with four equivalent U(1)Cu4As8 cuboctahedra, corners with eight equivalent Cu(1)U4As4 tetrahedra, edges with eight equivalent U(1)Cu4As8 cuboctahedra, edges with four equivalent Cu(1)U4As4 tetrahedra, and faces with four equivalent U(1)Cu4As8 cuboctahedra. Cu(1) is bonded to four equivalent U(1) and four equivalent As(1) atoms to form distorted CuU4As4 tetrahedra that share corners with eight equivalent U(1)Cu4As8 cuboctahedra, edges with four equivalent U(1)Cu4As8 cuboctahedra, edges with four equivalent Cu(1)U4As4 tetrahedra, and faces with four equivalent Cu(1)U4As4 tetrahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to four equivalent U(1) 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 As(2) atoms.
UCuAs2 is Parent of FeAs superconductors-derived structured and crystallizes in the tetragonal P4/nmm space group. U(1) is bonded to four equivalent Cu(1), four equivalent As(1), and four equivalent As(2) atoms to form distorted UCu4As8 cuboctahedra that share corners with four equivalent U(1)Cu4As8 cuboctahedra, corners with eight equivalent Cu(1)U4As4 tetrahedra, edges with eight equivalent U(1)Cu4As8 cuboctahedra, edges with four equivalent Cu(1)U4As4 tetrahedra, and faces with four equivalent U(1)Cu4As8 cuboctahedra. All U(1)-Cu(1) bond lengths are 3.21 Å. All U(1)-As(1) bond lengths are 2.95 Å. All U(1)-As(2) bond lengths are 2.98 Å. Cu(1) is bonded to four equivalent U(1) and four equivalent As(1) atoms to form distorted CuU4As4 tetrahedra that share corners with eight equivalent U(1)Cu4As8 cuboctahedra, edges with four equivalent U(1)Cu4As8 cuboctahedra, edges with four equivalent Cu(1)U4As4 tetrahedra, and faces with four equivalent Cu(1)U4As4 tetrahedra. All Cu(1)-As(1) bond lengths are 2.53 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to four equivalent U(1) 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 As(2) atoms. All As(2)-As(2) bond lengths are 2.80 Å.