Sr8Pr4Cu9(HgO8)3 crystallizes in the monoclinic C2/m space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(1); one O(2); one O(5); one O(6); one O(7); one O(8); and two equivalent O(9,10) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(3); one O(4); one O(5); one O(6); one O(7); one O(8); and two equivalent O(9,10) atoms. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms. In the second Pr site, Pr(2) is bonded in a body-centered cubic geometry to two equivalent O(3), two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms. There are five inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(1), one O(3), one O(7), and two equivalent O(5) atoms to form corner-sharing CuO5 square pyramids. In the second Cu site, Cu(2) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(4), one O(8), and two equivalent O(5) atoms. In the third Cu site, Cu(3) is bonded to one O(2); one O(3); one O(9,10); and two equivalent O(6) atoms to form corner-sharing CuO5 square pyramids. In the fourth Cu site, Cu(4) is bonded to one O(1); one O(4); one O(9,10); and two equivalent O(6) atoms to form corner-sharing CuO5 square pyramids. In the fifth Cu site, Cu(5) is bonded in a linear geometry to two equivalent O(8) atoms. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a linear geometry to two equivalent O(9,10) atoms. In the second Hg site, Hg(2) is bonded in a linear geometry to two equivalent O(7) atoms. There are nine inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), two equivalent Pr(1), one Cu(1), and one Cu(4) atom to form a mixture of distorted corner, face, and edge-sharing OSr2Pr2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-66°. In the second O site, O(2) is bonded to two equivalent Sr(1), two equivalent Pr(1), one Cu(2), and one Cu(3) atom to form a mixture of corner, face, and edge-sharing OSr2Pr2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-66°. In the third O site, O(3) is bonded to two equivalent Sr(2), two equivalent Pr(2), one Cu(1), and one Cu(3) atom to form a mixture of distorted corner, face, and edge-sharing OSr2Pr2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-66°. In the fourth O site, O(4) is bonded to two equivalent Sr(2), two equivalent Pr(2), one Cu(2), and one Cu(4) atom to form a mixture of corner, face, and edge-sharing OSr2Pr2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-66°. In the fifth O site, O(5) is bonded to one Sr(1), one Sr(2), one Pr(1), one Pr(2), one Cu(1), and one Cu(2) atom to form a mixture of corner, face, and edge-sharing OSr2Pr2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-66°. In the sixth O site, O(6) is bonded to one Sr(1), one Sr(2), one Pr(1), one Pr(2), one Cu(3), and one Cu(4) atom to form a mixture of distorted corner, face, and edge-sharing OSr2Pr2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-66°. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), one Cu(1), and one Hg(2) atom. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), one Cu(2), and one Cu(5) atom. In the ninth O site, O(9,10) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), one Cu(3), and one Hg(1) atom.
Sr8Pr4Cu9(HgO8)3 crystallizes in the monoclinic C2/m space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(1); one O(2); one O(5); one O(6); one O(7); one O(8); and two equivalent O(9,10) atoms. The Sr(1)-O(1) bond length is 2.70 Å. The Sr(1)-O(2) bond length is 2.63 Å. The Sr(1)-O(5) bond length is 2.63 Å. The Sr(1)-O(6) bond length is 2.69 Å. The Sr(1)-O(7) bond length is 2.81 Å. The Sr(1)-O(8) bond length is 2.80 Å. There is one shorter (2.80 Å) and one longer (2.87 Å) Sr(1)-O(9,10) bond length. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(3); one O(4); one O(5); one O(6); one O(7); one O(8); and two equivalent O(9,10) atoms. The Sr(2)-O(3) bond length is 2.70 Å. The Sr(2)-O(4) bond length is 2.63 Å. The Sr(2)-O(5) bond length is 2.64 Å. The Sr(2)-O(6) bond length is 2.70 Å. The Sr(2)-O(7) bond length is 2.81 Å. The Sr(2)-O(8) bond length is 2.80 Å. There is one shorter (2.80 Å) and one longer (2.87 Å) Sr(2)-O(9,10) bond length. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms. Both Pr(1)-O(1) bond lengths are 2.51 Å. Both Pr(1)-O(2) bond lengths are 2.51 Å. Both Pr(1)-O(5) bond lengths are 2.51 Å. Both Pr(1)-O(6) bond lengths are 2.51 Å. In the second Pr site, Pr(2) is bonded in a body-centered cubic geometry to two equivalent O(3), two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms. Both Pr(2)-O(3) bond lengths are 2.50 Å. Both Pr(2)-O(4) bond lengths are 2.52 Å. Both Pr(2)-O(5) bond lengths are 2.51 Å. Both Pr(2)-O(6) bond lengths are 2.51 Å. There are five inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(1), one O(3), one O(7), and two equivalent O(5) atoms to form corner-sharing CuO5 square pyramids. The Cu(1)-O(1) bond length is 1.93 Å. The Cu(1)-O(3) bond length is 1.93 Å. The Cu(1)-O(7) bond length is 2.36 Å. Both Cu(1)-O(5) bond lengths are 1.95 Å. In the second Cu site, Cu(2) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(4), one O(8), and two equivalent O(5) atoms. The Cu(2)-O(2) bond length is 1.93 Å. The Cu(2)-O(4) bond length is 1.93 Å. The Cu(2)-O(8) bond length is 2.61 Å. Both Cu(2)-O(5) bond lengths are 1.93 Å. In the third Cu site, Cu(3) is bonded to one O(2); one O(3); one O(9,10); and two equivalent O(6) atoms to form corner-sharing CuO5 square pyramids. The Cu(3)-O(2) bond length is 1.94 Å. The Cu(3)-O(3) bond length is 1.94 Å. The Cu(3)-O(9,10) bond length is 2.35 Å. Both Cu(3)-O(6) bond lengths are 1.94 Å. In the fourth Cu site, Cu(4) is bonded to one O(1); one O(4); one O(9,10); and two equivalent O(6) atoms to form corner-sharing CuO5 square pyramids. The Cu(4)-O(1) bond length is 1.94 Å. The Cu(4)-O(4) bond length is 1.95 Å. The Cu(4)-O(9,10) bond length is 2.36 Å. Both Cu(4)-O(6) bond lengths are 1.94 Å. In the fifth Cu site, Cu(5) is bonded in a linear geometry to two equivalent O(8) atoms. Both Cu(5)-O(8) bond lengths are 1.82 Å. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a linear geometry to two equivalent O(9,10) atoms. Both Hg(1)-O(9,10) bond lengths are 2.03 Å. In the second Hg site, Hg(2) is bonded in a linear geometry to two equivalent O(7) atoms. Both Hg(2)-O(7) bond lengths are 2.03 Å. There are nine inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), two equivalent Pr(1), one Cu(1), and one Cu(4) atom to form a mixture of distorted corner, face, and edge-sharing OSr2Pr2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-66°. In the second O site, O(2) is bonded to two equivalent Sr(1), two equivalent Pr(1), one Cu(2), and one Cu(3) atom to form a mixture of corner, face, and edge-sharing OSr2Pr2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-66°. In the third O site, O(3) is bonded to two equivalent Sr(2), two equivalent Pr(2), one Cu(1), and one Cu(3) atom to form a mixture of distorted corner, face, and edge-sharing OSr2Pr2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-66°. In the fourth O site, O(4) is bonded to two equivalent Sr(2), two equivalent Pr(2), one Cu(2), and one Cu(4) atom to form a mixture of corner, face, and edge-sharing OSr2Pr2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-66°. In the fifth O site, O(5) is bonded to one Sr(1), one Sr(2), one Pr(1), one Pr(2), one Cu(1), and one Cu(2) atom to form a mixture of corner, face, and edge-sharing OSr2Pr2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-66°. In the sixth O site, O(6) is bonded to one Sr(1), one Sr(2), one Pr(1), one Pr(2), one Cu(3), and one Cu(4) atom to form a mixture of distorted corner, face, and edge-sharing OSr2Pr2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-66°. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), one Cu(1), and one Hg(2) atom. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), one Cu(2), and one Cu(5) atom. In the ninth O site, O(9,10) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), one Cu(3), and one Hg(1) atom.