Sr5Ir3O11 is (La,Ba)CuO4-like structured and crystallizes in the monoclinic Cm space group. There are five inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(2), four equivalent O(1), and four equivalent O(6) atoms. In the second Sr site, Sr(2) is bonded to four equivalent O(1), four equivalent O(3), and four equivalent O(7) atoms to form SrO12 cuboctahedra that share corners with four equivalent Sr(2)O12 cuboctahedra, faces with four equivalent Sr(2)O12 cuboctahedra, faces with four equivalent Ir(2)O6 octahedra, and faces with four equivalent Ir(3)O6 octahedra. In the third Sr site, Sr(3) is bonded in a 9-coordinate geometry to one O(4), four equivalent O(3), and four equivalent O(8) atoms. In the fourth Sr site, Sr(4) is bonded in a 9-coordinate geometry to one O(8), four equivalent O(4), and four equivalent O(5) atoms. In the fifth Sr site, Sr(5) is bonded in a 9-coordinate geometry to one O(6), four equivalent O(2), and four equivalent O(5) atoms. There are three inequivalent Ir sites. In the first Ir site, Ir(1) is bonded to one O(2), one O(4), and four equivalent O(5) atoms to form corner-sharing IrO6 octahedra. The corner-sharing octahedral tilt angles are 10°. In the second Ir site, Ir(2) is bonded to one O(6), one O(7), and four equivalent O(1) atoms to form IrO6 octahedra that share  a cornercorner with one Ir(3)O6 octahedra, corners with four equivalent Ir(2)O6 octahedra, and faces with four equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-14°. In the third Ir site, Ir(3) is bonded to one O(7), one O(8), and four equivalent O(3) atoms to form IrO6 octahedra that share  a cornercorner with one Ir(2)O6 octahedra, corners with four equivalent Ir(3)O6 octahedra, and faces with four equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-14°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Ir(2) atoms. In the second O site, O(2) is bonded to one Sr(1), four equivalent Sr(5), and one Ir(1) atom to form distorted OSr5Ir octahedra that share  a cornercorner with one O(4)Sr5Ir octahedra, corners with four equivalent O(2)Sr5Ir octahedra, corners with eight equivalent O(5)Sr4Ir2 octahedra, edges with four equivalent O(2)Sr5Ir octahedra, edges with four equivalent O(6)Sr5Ir octahedra, and faces with four equivalent O(5)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 1-57°. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Sr(2), two equivalent Sr(3), and two equivalent Ir(3) atoms. In the fourth O site, O(4) is bonded to one Sr(3), four equivalent Sr(4), and one Ir(1) atom to form distorted OSr5Ir octahedra that share  a cornercorner with one O(2)Sr5Ir octahedra, corners with four equivalent O(4)Sr5Ir octahedra, corners with eight equivalent O(5)Sr4Ir2 octahedra, edges with four equivalent O(4)Sr5Ir octahedra, edges with four equivalent O(8)Sr5Ir octahedra, and faces with four equivalent O(5)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 1-57°. In the fifth O site, O(5) is bonded to two equivalent Sr(4), two equivalent Sr(5), and two equivalent Ir(1) atoms to form distorted OSr4Ir2 octahedra that share corners with two equivalent O(5)Sr4Ir2 octahedra, corners with two equivalent O(6)Sr5Ir octahedra, corners with two equivalent O(8)Sr5Ir octahedra, corners with four equivalent O(2)Sr5Ir octahedra, corners with four equivalent O(4)Sr5Ir octahedra, edges with two equivalent O(5)Sr4Ir2 octahedra, faces with two equivalent O(2)Sr5Ir octahedra, faces with two equivalent O(4)Sr5Ir octahedra, and faces with four equivalent O(5)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 10-57°. In the sixth O site, O(6) is bonded to one Sr(5), four equivalent Sr(1), and one Ir(2) atom to form distorted OSr5Ir octahedra that share  a cornercorner with one O(7)Sr4Ir2 octahedra, corners with four equivalent O(5)Sr4Ir2 octahedra, corners with four equivalent O(6)Sr5Ir octahedra, edges with four equivalent O(2)Sr5Ir octahedra, and edges with four equivalent O(6)Sr5Ir octahedra. The corner-sharing octahedral tilt angles range from 1-48°. In the seventh O site, O(7) is bonded to four equivalent Sr(2), one Ir(2), and one Ir(3) atom to form distorted OSr4Ir2 octahedra that share  a cornercorner with one O(6)Sr5Ir octahedra,  a cornercorner with one O(8)Sr5Ir octahedra, corners with four equivalent O(7)Sr4Ir2 octahedra, and edges with four equivalent O(7)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the eighth O site, O(8) is bonded to one Sr(4), four equivalent Sr(3), and one Ir(3) atom to form distorted OSr5Ir octahedra that share  a cornercorner with one O(7)Sr4Ir2 octahedra, corners with four equivalent O(5)Sr4Ir2 octahedra, corners with four equivalent O(8)Sr5Ir octahedra, edges with four equivalent O(4)Sr5Ir octahedra, and edges with four equivalent O(8)Sr5Ir octahedra. The corner-sharing octahedral tilt angles range from 1-48°.
Sr5Ir3O11 is (La,Ba)CuO4-like structured and crystallizes in the monoclinic Cm space group. There are five inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(2), four equivalent O(1), and four equivalent O(6) atoms. The Sr(1)-O(2) bond length is 2.45 Å. There are two shorter (2.58 Å) and two longer (2.84 Å) Sr(1)-O(1) bond lengths. There are a spread of Sr(1)-O(6) bond distances ranging from 2.70-2.87 Å. In the second Sr site, Sr(2) is bonded to four equivalent O(1), four equivalent O(3), and four equivalent O(7) atoms to form SrO12 cuboctahedra that share corners with four equivalent Sr(2)O12 cuboctahedra, faces with four equivalent Sr(2)O12 cuboctahedra, faces with four equivalent Ir(2)O6 octahedra, and faces with four equivalent Ir(3)O6 octahedra. There are two shorter (2.66 Å) and two longer (3.02 Å) Sr(2)-O(1) bond lengths. There are two shorter (2.66 Å) and two longer (3.02 Å) Sr(2)-O(3) bond lengths. There are a spread of Sr(2)-O(7) bond distances ranging from 2.76-2.86 Å. In the third Sr site, Sr(3) is bonded in a 9-coordinate geometry to one O(4), four equivalent O(3), and four equivalent O(8) atoms. The Sr(3)-O(4) bond length is 2.44 Å. There are two shorter (2.57 Å) and two longer (2.85 Å) Sr(3)-O(3) bond lengths. There are a spread of Sr(3)-O(8) bond distances ranging from 2.71-2.87 Å. In the fourth Sr site, Sr(4) is bonded in a 9-coordinate geometry to one O(8), four equivalent O(4), and four equivalent O(5) atoms. The Sr(4)-O(8) bond length is 2.44 Å. There are a spread of Sr(4)-O(4) bond distances ranging from 2.73-2.87 Å. There are two shorter (2.61 Å) and two longer (2.83 Å) Sr(4)-O(5) bond lengths. In the fifth Sr site, Sr(5) is bonded in a 9-coordinate geometry to one O(6), four equivalent O(2), and four equivalent O(5) atoms. The Sr(5)-O(6) bond length is 2.44 Å. There are a spread of Sr(5)-O(2) bond distances ranging from 2.71-2.87 Å. There are two shorter (2.62 Å) and two longer (2.82 Å) Sr(5)-O(5) bond lengths. There are three inequivalent Ir sites. In the first Ir site, Ir(1) is bonded to one O(2), one O(4), and four equivalent O(5) atoms to form corner-sharing IrO6 octahedra. The corner-sharing octahedral tilt angles are 10°. The Ir(1)-O(2) bond length is 2.08 Å. The Ir(1)-O(4) bond length is 2.08 Å. There are two shorter (1.99 Å) and two longer (2.01 Å) Ir(1)-O(5) bond lengths. In the second Ir site, Ir(2) is bonded to one O(6), one O(7), and four equivalent O(1) atoms to form IrO6 octahedra that share  a cornercorner with one Ir(3)O6 octahedra, corners with four equivalent Ir(2)O6 octahedra, and faces with four equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-14°. The Ir(2)-O(6) bond length is 2.03 Å. The Ir(2)-O(7) bond length is 2.06 Å. There are two shorter (1.99 Å) and two longer (2.02 Å) Ir(2)-O(1) bond lengths. In the third Ir site, Ir(3) is bonded to one O(7), one O(8), and four equivalent O(3) atoms to form IrO6 octahedra that share  a cornercorner with one Ir(2)O6 octahedra, corners with four equivalent Ir(3)O6 octahedra, and faces with four equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-14°. The Ir(3)-O(7) bond length is 2.06 Å. The Ir(3)-O(8) bond length is 2.03 Å. There are two shorter (1.99 Å) and two longer (2.02 Å) Ir(3)-O(3) bond lengths. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Ir(2) atoms. In the second O site, O(2) is bonded to one Sr(1), four equivalent Sr(5), and one Ir(1) atom to form distorted OSr5Ir octahedra that share  a cornercorner with one O(4)Sr5Ir octahedra, corners with four equivalent O(2)Sr5Ir octahedra, corners with eight equivalent O(5)Sr4Ir2 octahedra, edges with four equivalent O(2)Sr5Ir octahedra, edges with four equivalent O(6)Sr5Ir octahedra, and faces with four equivalent O(5)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 1-57°. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Sr(2), two equivalent Sr(3), and two equivalent Ir(3) atoms. In the fourth O site, O(4) is bonded to one Sr(3), four equivalent Sr(4), and one Ir(1) atom to form distorted OSr5Ir octahedra that share  a cornercorner with one O(2)Sr5Ir octahedra, corners with four equivalent O(4)Sr5Ir octahedra, corners with eight equivalent O(5)Sr4Ir2 octahedra, edges with four equivalent O(4)Sr5Ir octahedra, edges with four equivalent O(8)Sr5Ir octahedra, and faces with four equivalent O(5)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 1-57°. In the fifth O site, O(5) is bonded to two equivalent Sr(4), two equivalent Sr(5), and two equivalent Ir(1) atoms to form distorted OSr4Ir2 octahedra that share corners with two equivalent O(5)Sr4Ir2 octahedra, corners with two equivalent O(6)Sr5Ir octahedra, corners with two equivalent O(8)Sr5Ir octahedra, corners with four equivalent O(2)Sr5Ir octahedra, corners with four equivalent O(4)Sr5Ir octahedra, edges with two equivalent O(5)Sr4Ir2 octahedra, faces with two equivalent O(2)Sr5Ir octahedra, faces with two equivalent O(4)Sr5Ir octahedra, and faces with four equivalent O(5)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 10-57°. In the sixth O site, O(6) is bonded to one Sr(5), four equivalent Sr(1), and one Ir(2) atom to form distorted OSr5Ir octahedra that share  a cornercorner with one O(7)Sr4Ir2 octahedra, corners with four equivalent O(5)Sr4Ir2 octahedra, corners with four equivalent O(6)Sr5Ir octahedra, edges with four equivalent O(2)Sr5Ir octahedra, and edges with four equivalent O(6)Sr5Ir octahedra. The corner-sharing octahedral tilt angles range from 1-48°. In the seventh O site, O(7) is bonded to four equivalent Sr(2), one Ir(2), and one Ir(3) atom to form distorted OSr4Ir2 octahedra that share  a cornercorner with one O(6)Sr5Ir octahedra,  a cornercorner with one O(8)Sr5Ir octahedra, corners with four equivalent O(7)Sr4Ir2 octahedra, and edges with four equivalent O(7)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the eighth O site, O(8) is bonded to one Sr(4), four equivalent Sr(3), and one Ir(3) atom to form distorted OSr5Ir octahedra that share  a cornercorner with one O(7)Sr4Ir2 octahedra, corners with four equivalent O(5)Sr4Ir2 octahedra, corners with four equivalent O(8)Sr5Ir octahedra, edges with four equivalent O(4)Sr5Ir octahedra, and edges with four equivalent O(8)Sr5Ir octahedra. The corner-sharing octahedral tilt angles range from 1-48°.