KEu(CuTe2)2 is Parent of FeAs superconductors-like structured and crystallizes in the tetragonal P4mm space group. K(1) is bonded to four equivalent Cu(1), four equivalent Te(1), and four equivalent Te(2) atoms to form distorted KCu4Te8 cuboctahedra that share corners with four equivalent K(1)Cu4Te8 cuboctahedra, corners with eight equivalent Cu(1)K2Eu2Te4 tetrahedra, edges with eight equivalent Eu(1)Cu4Te8 cuboctahedra, edges with four equivalent Cu(1)K2Eu2Te4 tetrahedra, and faces with four equivalent K(1)Cu4Te8 cuboctahedra. Eu(1) is bonded to four equivalent Cu(1), four equivalent Te(2), and four equivalent Te(3) atoms to form distorted EuCu4Te8 cuboctahedra that share corners with four equivalent Eu(1)Cu4Te8 cuboctahedra, corners with eight equivalent Cu(1)K2Eu2Te4 tetrahedra, edges with eight equivalent K(1)Cu4Te8 cuboctahedra, edges with four equivalent Cu(1)K2Eu2Te4 tetrahedra, and faces with four equivalent Eu(1)Cu4Te8 cuboctahedra. Cu(1) is bonded to two equivalent K(1), two equivalent Eu(1), two equivalent Te(1), and two equivalent Te(3) atoms to form distorted CuK2Eu2Te4 tetrahedra that share corners with four equivalent K(1)Cu4Te8 cuboctahedra, corners with four equivalent Eu(1)Cu4Te8 cuboctahedra, edges with two equivalent K(1)Cu4Te8 cuboctahedra, edges with two equivalent Eu(1)Cu4Te8 cuboctahedra, edges with four equivalent Cu(1)K2Eu2Te4 tetrahedra, and faces with four equivalent Cu(1)K2Eu2Te4 tetrahedra. There are three inequivalent Te sites. In the first Te site, Te(1) is bonded in a 8-coordinate geometry to four equivalent K(1) and four equivalent Cu(1) atoms. In the second Te site, Te(2) is bonded in a 8-coordinate geometry to two equivalent K(1), two equivalent Eu(1), and four equivalent Te(2) atoms. In the third Te site, Te(3) is bonded in a 8-coordinate geometry to four equivalent Eu(1) and four equivalent Cu(1) atoms.
KEu(CuTe2)2 is Parent of FeAs superconductors-like structured and crystallizes in the tetragonal P4mm space group. K(1) is bonded to four equivalent Cu(1), four equivalent Te(1), and four equivalent Te(2) atoms to form distorted KCu4Te8 cuboctahedra that share corners with four equivalent K(1)Cu4Te8 cuboctahedra, corners with eight equivalent Cu(1)K2Eu2Te4 tetrahedra, edges with eight equivalent Eu(1)Cu4Te8 cuboctahedra, edges with four equivalent Cu(1)K2Eu2Te4 tetrahedra, and faces with four equivalent K(1)Cu4Te8 cuboctahedra. All K(1)-Cu(1) bond lengths are 3.78 Å. All K(1)-Te(1) bond lengths are 3.53 Å. All K(1)-Te(2) bond lengths are 3.72 Å. Eu(1) is bonded to four equivalent Cu(1), four equivalent Te(2), and four equivalent Te(3) atoms to form distorted EuCu4Te8 cuboctahedra that share corners with four equivalent Eu(1)Cu4Te8 cuboctahedra, corners with eight equivalent Cu(1)K2Eu2Te4 tetrahedra, edges with eight equivalent K(1)Cu4Te8 cuboctahedra, edges with four equivalent Cu(1)K2Eu2Te4 tetrahedra, and faces with four equivalent Eu(1)Cu4Te8 cuboctahedra. All Eu(1)-Cu(1) bond lengths are 3.54 Å. All Eu(1)-Te(2) bond lengths are 3.39 Å. All Eu(1)-Te(3) bond lengths are 3.33 Å. Cu(1) is bonded to two equivalent K(1), two equivalent Eu(1), two equivalent Te(1), and two equivalent Te(3) atoms to form distorted CuK2Eu2Te4 tetrahedra that share corners with four equivalent K(1)Cu4Te8 cuboctahedra, corners with four equivalent Eu(1)Cu4Te8 cuboctahedra, edges with two equivalent K(1)Cu4Te8 cuboctahedra, edges with two equivalent Eu(1)Cu4Te8 cuboctahedra, edges with four equivalent Cu(1)K2Eu2Te4 tetrahedra, and faces with four equivalent Cu(1)K2Eu2Te4 tetrahedra. Both Cu(1)-Te(1) bond lengths are 2.65 Å. Both Cu(1)-Te(3) bond lengths are 2.77 Å. There are three inequivalent Te sites. In the first Te site, Te(1) is bonded in a 8-coordinate geometry to four equivalent K(1) and four equivalent Cu(1) atoms. In the second Te site, Te(2) is bonded in a 8-coordinate geometry to two equivalent K(1), two equivalent Eu(1), and four equivalent Te(2) atoms. All Te(2)-Te(2) bond lengths are 3.14 Å. In the third Te site, Te(3) is bonded in a 8-coordinate geometry to four equivalent Eu(1) and four equivalent Cu(1) atoms.