KLa7(CuO4)4 is (La,Ba)CuO4-derived structured and crystallizes in the tetragonal I4mm space group. K(1) is bonded in a 9-coordinate geometry to one O(7), four equivalent O(1), and four equivalent O(8) atoms. There are five inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to one O(4), four equivalent O(1), and four equivalent O(5) atoms. In the second La site, La(2) is bonded in a 9-coordinate geometry to one O(3), four equivalent O(1), and four equivalent O(5) atoms. In the third La site, La(3) is bonded in a 9-coordinate geometry to one O(5), two equivalent O(3), two equivalent O(4), and four equivalent O(2) atoms. In the fourth La site, La(4) is bonded in a 9-coordinate geometry to one O(6), four equivalent O(1), and four equivalent O(8) atoms. In the fifth La site, La(5) is bonded in a 9-coordinate geometry to one O(8), two equivalent O(6), two equivalent O(7), and four equivalent O(2) atoms. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(5), one O(8), and four equivalent O(1) atoms to form distorted corner-sharing CuO6 octahedra. The corner-sharing octahedral tilt angles are 12°. In the second Cu site, Cu(2) is bonded to one O(3), one O(6), and four equivalent O(2) atoms to form corner-sharing CuO6 octahedra. The corner-sharing octahedral tilt angles are 1°. In the third Cu site, Cu(3) is bonded to one O(4), one O(7), and four equivalent O(2) atoms to form corner-sharing CuO6 octahedra. The corner-sharing octahedral tilt angles are 1°. There are eight inequivalent O sites. In the first O site, O(3) is bonded to one La(2), four equivalent La(3), and one Cu(2) atom to form distorted OLa5Cu octahedra that share  a cornercorner with one O(6)La5Cu octahedra, corners with four equivalent O(1)KLa3Cu2 octahedra, corners with four equivalent O(3)La5Cu octahedra, corners with eight equivalent O(2)La4Cu2 octahedra, edges with four equivalent O(4)La5Cu octahedra, and faces with four equivalent O(2)La4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-50°. In the second O site, O(4) is bonded to one La(1), four equivalent La(3), and one Cu(3) atom to form distorted OLa5Cu octahedra that share  a cornercorner with one O(7)KLa4Cu octahedra, corners with four equivalent O(1)KLa3Cu2 octahedra, corners with four equivalent O(4)La5Cu octahedra, corners with eight equivalent O(2)La4Cu2 octahedra, edges with four equivalent O(3)La5Cu octahedra, and faces with four equivalent O(2)La4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-53°. In the third O site, O(5) is bonded in a 6-coordinate geometry to one La(3), two equivalent La(1), two equivalent La(2), and one Cu(1) atom. In the fourth O site, O(6) is bonded to one La(4), four equivalent La(5), and one Cu(2) atom to form distorted OLa5Cu octahedra that share  a cornercorner with one O(3)La5Cu octahedra, corners with four equivalent O(1)KLa3Cu2 octahedra, corners with four equivalent O(6)La5Cu octahedra, corners with eight equivalent O(2)La4Cu2 octahedra, edges with four equivalent O(7)KLa4Cu octahedra, and faces with four equivalent O(2)La4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-51°. In the fifth O site, O(7) is bonded to one K(1), four equivalent La(5), and one Cu(3) atom to form OKLa4Cu octahedra that share  a cornercorner with one O(4)La5Cu octahedra, corners with four equivalent O(1)KLa3Cu2 octahedra, corners with four equivalent O(7)KLa4Cu octahedra, corners with eight equivalent O(2)La4Cu2 octahedra, edges with four equivalent O(6)La5Cu octahedra, and faces with four equivalent O(2)La4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-59°. In the sixth O site, O(8) is bonded in a 6-coordinate geometry to two equivalent K(1), one La(5), two equivalent La(4), and one Cu(1) atom. In the seventh O site, O(1) is bonded to one K(1), one La(1), one La(2), one La(4), and two equivalent Cu(1) atoms to form distorted OKLa3Cu2 octahedra that share  a cornercorner with one O(7)KLa4Cu octahedra,  a cornercorner with one O(3)La5Cu octahedra,  a cornercorner with one O(4)La5Cu octahedra,  a cornercorner with one O(6)La5Cu octahedra, corners with two equivalent O(1)KLa3Cu2 octahedra, edges with two equivalent O(1)KLa3Cu2 octahedra, and faces with four equivalent O(1)KLa3Cu2 octahedra. The corner-sharing octahedral tilt angles range from 12-50°. In the eighth O site, O(2) is bonded to two equivalent La(3), two equivalent La(5), one Cu(2), and one Cu(3) atom to form distorted OLa4Cu2 octahedra that share corners with two equivalent O(7)KLa4Cu octahedra, corners with two equivalent O(2)La4Cu2 octahedra, corners with two equivalent O(3)La5Cu octahedra, corners with two equivalent O(4)La5Cu octahedra, corners with two equivalent O(6)La5Cu octahedra, edges with two equivalent O(2)La4Cu2 octahedra,  a faceface with one O(7)KLa4Cu octahedra,  a faceface with one O(3)La5Cu octahedra,  a faceface with one O(4)La5Cu octahedra,  a faceface with one O(6)La5Cu octahedra, and faces with four equivalent O(2)La4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-59°.
KLa7(CuO4)4 is (La,Ba)CuO4-derived structured and crystallizes in the tetragonal I4mm space group. K(1) is bonded in a 9-coordinate geometry to one O(7), four equivalent O(1), and four equivalent O(8) atoms. The K(1)-O(7) bond length is 2.64 Å. All K(1)-O(1) bond lengths are 2.82 Å. All K(1)-O(8) bond lengths are 2.76 Å. There are five inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to one O(4), four equivalent O(1), and four equivalent O(5) atoms. The La(1)-O(4) bond length is 2.47 Å. All La(1)-O(1) bond lengths are 2.53 Å. All La(1)-O(5) bond lengths are 2.77 Å. In the second La site, La(2) is bonded in a 9-coordinate geometry to one O(3), four equivalent O(1), and four equivalent O(5) atoms. The La(2)-O(3) bond length is 2.37 Å. All La(2)-O(1) bond lengths are 2.57 Å. All La(2)-O(5) bond lengths are 2.79 Å. In the third La site, La(3) is bonded in a 9-coordinate geometry to one O(5), two equivalent O(3), two equivalent O(4), and four equivalent O(2) atoms. The La(3)-O(5) bond length is 2.31 Å. Both La(3)-O(3) bond lengths are 2.77 Å. Both La(3)-O(4) bond lengths are 2.74 Å. All La(3)-O(2) bond lengths are 2.62 Å. In the fourth La site, La(4) is bonded in a 9-coordinate geometry to one O(6), four equivalent O(1), and four equivalent O(8) atoms. The La(4)-O(6) bond length is 2.33 Å. All La(4)-O(1) bond lengths are 2.69 Å. All La(4)-O(8) bond lengths are 2.77 Å. In the fifth La site, La(5) is bonded in a 9-coordinate geometry to one O(8), two equivalent O(6), two equivalent O(7), and four equivalent O(2) atoms. The La(5)-O(8) bond length is 2.23 Å. Both La(5)-O(6) bond lengths are 2.75 Å. Both La(5)-O(7) bond lengths are 2.71 Å. All La(5)-O(2) bond lengths are 2.72 Å. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(5), one O(8), and four equivalent O(1) atoms to form distorted corner-sharing CuO6 octahedra. The corner-sharing octahedral tilt angles are 12°. The Cu(1)-O(5) bond length is 2.50 Å. The Cu(1)-O(8) bond length is 2.35 Å. All Cu(1)-O(1) bond lengths are 1.93 Å. In the second Cu site, Cu(2) is bonded to one O(3), one O(6), and four equivalent O(2) atoms to form corner-sharing CuO6 octahedra. The corner-sharing octahedral tilt angles are 1°. The Cu(2)-O(3) bond length is 2.39 Å. The Cu(2)-O(6) bond length is 2.43 Å. All Cu(2)-O(2) bond lengths are 1.88 Å. In the third Cu site, Cu(3) is bonded to one O(4), one O(7), and four equivalent O(2) atoms to form corner-sharing CuO6 octahedra. The corner-sharing octahedral tilt angles are 1°. The Cu(3)-O(4) bond length is 2.25 Å. The Cu(3)-O(7) bond length is 2.01 Å. All Cu(3)-O(2) bond lengths are 1.95 Å. There are eight inequivalent O sites. In the first O site, O(3) is bonded to one La(2), four equivalent La(3), and one Cu(2) atom to form distorted OLa5Cu octahedra that share  a cornercorner with one O(6)La5Cu octahedra, corners with four equivalent O(1)KLa3Cu2 octahedra, corners with four equivalent O(3)La5Cu octahedra, corners with eight equivalent O(2)La4Cu2 octahedra, edges with four equivalent O(4)La5Cu octahedra, and faces with four equivalent O(2)La4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-50°. In the second O site, O(4) is bonded to one La(1), four equivalent La(3), and one Cu(3) atom to form distorted OLa5Cu octahedra that share  a cornercorner with one O(7)KLa4Cu octahedra, corners with four equivalent O(1)KLa3Cu2 octahedra, corners with four equivalent O(4)La5Cu octahedra, corners with eight equivalent O(2)La4Cu2 octahedra, edges with four equivalent O(3)La5Cu octahedra, and faces with four equivalent O(2)La4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-53°. In the third O site, O(5) is bonded in a 6-coordinate geometry to one La(3), two equivalent La(1), two equivalent La(2), and one Cu(1) atom. In the fourth O site, O(6) is bonded to one La(4), four equivalent La(5), and one Cu(2) atom to form distorted OLa5Cu octahedra that share  a cornercorner with one O(3)La5Cu octahedra, corners with four equivalent O(1)KLa3Cu2 octahedra, corners with four equivalent O(6)La5Cu octahedra, corners with eight equivalent O(2)La4Cu2 octahedra, edges with four equivalent O(7)KLa4Cu octahedra, and faces with four equivalent O(2)La4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-51°. In the fifth O site, O(7) is bonded to one K(1), four equivalent La(5), and one Cu(3) atom to form OKLa4Cu octahedra that share  a cornercorner with one O(4)La5Cu octahedra, corners with four equivalent O(1)KLa3Cu2 octahedra, corners with four equivalent O(7)KLa4Cu octahedra, corners with eight equivalent O(2)La4Cu2 octahedra, edges with four equivalent O(6)La5Cu octahedra, and faces with four equivalent O(2)La4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-59°. In the sixth O site, O(8) is bonded in a 6-coordinate geometry to two equivalent K(1), one La(5), two equivalent La(4), and one Cu(1) atom. In the seventh O site, O(1) is bonded to one K(1), one La(1), one La(2), one La(4), and two equivalent Cu(1) atoms to form distorted OKLa3Cu2 octahedra that share  a cornercorner with one O(7)KLa4Cu octahedra,  a cornercorner with one O(3)La5Cu octahedra,  a cornercorner with one O(4)La5Cu octahedra,  a cornercorner with one O(6)La5Cu octahedra, corners with two equivalent O(1)KLa3Cu2 octahedra, edges with two equivalent O(1)KLa3Cu2 octahedra, and faces with four equivalent O(1)KLa3Cu2 octahedra. The corner-sharing octahedral tilt angles range from 12-50°. In the eighth O site, O(2) is bonded to two equivalent La(3), two equivalent La(5), one Cu(2), and one Cu(3) atom to form distorted OLa4Cu2 octahedra that share corners with two equivalent O(7)KLa4Cu octahedra, corners with two equivalent O(2)La4Cu2 octahedra, corners with two equivalent O(3)La5Cu octahedra, corners with two equivalent O(4)La5Cu octahedra, corners with two equivalent O(6)La5Cu octahedra, edges with two equivalent O(2)La4Cu2 octahedra,  a faceface with one O(7)KLa4Cu octahedra,  a faceface with one O(3)La5Cu octahedra,  a faceface with one O(4)La5Cu octahedra,  a faceface with one O(6)La5Cu octahedra, and faces with four equivalent O(2)La4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-59°.