Sr6Pr3Cu6O17 crystallizes in the orthorhombic Imm2 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(2), two equivalent O(3), two equivalent O(4), and three equivalent O(5) atoms. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(4), two equivalent O(2), and four equivalent O(5) atoms. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. In the second Pr site, Pr(2) is bonded in a 9-coordinate geometry to one O(6), two equivalent O(1), two equivalent O(2), and four equivalent O(3) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(1), one O(3), one O(5), and two equivalent O(2) atoms to form corner-sharing CuO5 square pyramids. In the second Cu site, Cu(2) is bonded in a rectangular see-saw-like geometry to one O(4), one O(6), and two equivalent O(3) atoms. There are six inequivalent O sites. In the first O site, O(2) is bonded to one Sr(1), one Sr(2), one Pr(1), one Pr(2), and two equivalent Cu(1) atoms to form distorted OSr2Pr2Cu2 octahedra that share corners with two equivalent O(1)Pr4Cu2 octahedra, corners with two equivalent O(3)Sr2Pr2Cu2 octahedra, corners with three equivalent O(2)Sr2Pr2Cu2 octahedra, corners with three equivalent O(4)Sr5Cu octahedra, corners with three equivalent O(5)Sr5Cu octahedra, edges with two equivalent O(2)Sr2Pr2Cu2 octahedra, faces with two equivalent O(1)Pr4Cu2 octahedra, faces with two equivalent O(3)Sr2Pr2Cu2 octahedra, and faces with two equivalent O(5)Sr5Cu octahedra. The corner-sharing octahedral tilt angles range from 1-65°. In the second O site, O(3) is bonded to two equivalent Sr(1), two equivalent Pr(2), one Cu(1), and one Cu(2) atom to form distorted OSr2Pr2Cu2 octahedra that share corners with two equivalent O(1)Pr4Cu2 octahedra, corners with two equivalent O(2)Sr2Pr2Cu2 octahedra, corners with two equivalent O(4)Sr5Cu octahedra, corners with three equivalent O(3)Sr2Pr2Cu2 octahedra, corners with four equivalent O(5)Sr5Cu octahedra, edges with three equivalent O(3)Sr2Pr2Cu2 octahedra,  a faceface with one O(1)Pr4Cu2 octahedra,  a faceface with one O(4)Sr5Cu octahedra,  a faceface with one O(5)Sr5Cu octahedra, and faces with two equivalent O(2)Sr2Pr2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 13-65°. In the third O site, O(4) is bonded to one Sr(2), four equivalent Sr(1), and one Cu(2) atom to form distorted OSr5Cu octahedra that share corners with four equivalent O(3)Sr2Pr2Cu2 octahedra, corners with four equivalent O(5)Sr5Cu octahedra, corners with six equivalent O(2)Sr2Pr2Cu2 octahedra, edges with two equivalent O(4)Sr5Cu octahedra, edges with six equivalent O(5)Sr5Cu octahedra, and faces with two equivalent O(3)Sr2Pr2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 10-65°. In the fourth O site, O(5) is bonded to two equivalent Sr(2), three equivalent Sr(1), and one Cu(1) atom to form distorted OSr5Cu octahedra that share  a cornercorner with one O(1)Pr4Cu2 octahedra, corners with two equivalent O(4)Sr5Cu octahedra, corners with two equivalent O(5)Sr5Cu octahedra, corners with three equivalent O(2)Sr2Pr2Cu2 octahedra, corners with four equivalent O(3)Sr2Pr2Cu2 octahedra, edges with three equivalent O(4)Sr5Cu octahedra, edges with five equivalent O(5)Sr5Cu octahedra,  a faceface with one O(3)Sr2Pr2Cu2 octahedra, and faces with two equivalent O(2)Sr2Pr2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-64°. In the fifth O site, O(6) is bonded in a distorted see-saw-like geometry to two equivalent Pr(2) and two equivalent Cu(2) atoms. In the sixth O site, O(1) is bonded to two equivalent Pr(1), two equivalent Pr(2), and two equivalent Cu(1) atoms to form distorted OPr4Cu2 octahedra that share corners with two equivalent O(1)Pr4Cu2 octahedra, corners with two equivalent O(5)Sr5Cu octahedra, corners with four equivalent O(2)Sr2Pr2Cu2 octahedra, corners with four equivalent O(3)Sr2Pr2Cu2 octahedra, edges with three equivalent O(1)Pr4Cu2 octahedra, faces with two equivalent O(3)Sr2Pr2Cu2 octahedra, and faces with four equivalent O(2)Sr2Pr2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-65°.
Sr6Pr3Cu6O17 crystallizes in the orthorhombic Imm2 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(2), two equivalent O(3), two equivalent O(4), and three equivalent O(5) atoms. The Sr(1)-O(2) bond length is 2.72 Å. There is one shorter (2.73 Å) and one longer (2.77 Å) Sr(1)-O(3) bond length. There is one shorter (2.76 Å) and one longer (2.84 Å) Sr(1)-O(4) bond length. There are a spread of Sr(1)-O(5) bond distances ranging from 2.46-2.74 Å. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(4), two equivalent O(2), and four equivalent O(5) atoms. The Sr(2)-O(4) bond length is 2.49 Å. Both Sr(2)-O(2) bond lengths are 2.68 Å. All Sr(2)-O(5) bond lengths are 2.63 Å. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. There are two shorter (2.47 Å) and two longer (2.48 Å) Pr(1)-O(1) bond lengths. All Pr(1)-O(2) bond lengths are 2.50 Å. In the second Pr site, Pr(2) is bonded in a 9-coordinate geometry to one O(6), two equivalent O(1), two equivalent O(2), and four equivalent O(3) atoms. The Pr(2)-O(6) bond length is 2.48 Å. There is one shorter (2.60 Å) and one longer (2.70 Å) Pr(2)-O(1) bond length. Both Pr(2)-O(2) bond lengths are 2.60 Å. There are two shorter (2.53 Å) and two longer (2.59 Å) Pr(2)-O(3) bond lengths. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(1), one O(3), one O(5), and two equivalent O(2) atoms to form corner-sharing CuO5 square pyramids. The Cu(1)-O(1) bond length is 2.09 Å. The Cu(1)-O(3) bond length is 2.26 Å. The Cu(1)-O(5) bond length is 2.00 Å. Both Cu(1)-O(2) bond lengths are 1.91 Å. In the second Cu site, Cu(2) is bonded in a rectangular see-saw-like geometry to one O(4), one O(6), and two equivalent O(3) atoms. The Cu(2)-O(4) bond length is 1.93 Å. The Cu(2)-O(6) bond length is 1.96 Å. Both Cu(2)-O(3) bond lengths are 1.88 Å. There are six inequivalent O sites. In the first O site, O(2) is bonded to one Sr(1), one Sr(2), one Pr(1), one Pr(2), and two equivalent Cu(1) atoms to form distorted OSr2Pr2Cu2 octahedra that share corners with two equivalent O(1)Pr4Cu2 octahedra, corners with two equivalent O(3)Sr2Pr2Cu2 octahedra, corners with three equivalent O(2)Sr2Pr2Cu2 octahedra, corners with three equivalent O(4)Sr5Cu octahedra, corners with three equivalent O(5)Sr5Cu octahedra, edges with two equivalent O(2)Sr2Pr2Cu2 octahedra, faces with two equivalent O(1)Pr4Cu2 octahedra, faces with two equivalent O(3)Sr2Pr2Cu2 octahedra, and faces with two equivalent O(5)Sr5Cu octahedra. The corner-sharing octahedral tilt angles range from 1-65°. In the second O site, O(3) is bonded to two equivalent Sr(1), two equivalent Pr(2), one Cu(1), and one Cu(2) atom to form distorted OSr2Pr2Cu2 octahedra that share corners with two equivalent O(1)Pr4Cu2 octahedra, corners with two equivalent O(2)Sr2Pr2Cu2 octahedra, corners with two equivalent O(4)Sr5Cu octahedra, corners with three equivalent O(3)Sr2Pr2Cu2 octahedra, corners with four equivalent O(5)Sr5Cu octahedra, edges with three equivalent O(3)Sr2Pr2Cu2 octahedra,  a faceface with one O(1)Pr4Cu2 octahedra,  a faceface with one O(4)Sr5Cu octahedra,  a faceface with one O(5)Sr5Cu octahedra, and faces with two equivalent O(2)Sr2Pr2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 13-65°. In the third O site, O(4) is bonded to one Sr(2), four equivalent Sr(1), and one Cu(2) atom to form distorted OSr5Cu octahedra that share corners with four equivalent O(3)Sr2Pr2Cu2 octahedra, corners with four equivalent O(5)Sr5Cu octahedra, corners with six equivalent O(2)Sr2Pr2Cu2 octahedra, edges with two equivalent O(4)Sr5Cu octahedra, edges with six equivalent O(5)Sr5Cu octahedra, and faces with two equivalent O(3)Sr2Pr2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 10-65°. In the fourth O site, O(5) is bonded to two equivalent Sr(2), three equivalent Sr(1), and one Cu(1) atom to form distorted OSr5Cu octahedra that share  a cornercorner with one O(1)Pr4Cu2 octahedra, corners with two equivalent O(4)Sr5Cu octahedra, corners with two equivalent O(5)Sr5Cu octahedra, corners with three equivalent O(2)Sr2Pr2Cu2 octahedra, corners with four equivalent O(3)Sr2Pr2Cu2 octahedra, edges with three equivalent O(4)Sr5Cu octahedra, edges with five equivalent O(5)Sr5Cu octahedra,  a faceface with one O(3)Sr2Pr2Cu2 octahedra, and faces with two equivalent O(2)Sr2Pr2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-64°. In the fifth O site, O(6) is bonded in a distorted see-saw-like geometry to two equivalent Pr(2) and two equivalent Cu(2) atoms. In the sixth O site, O(1) is bonded to two equivalent Pr(1), two equivalent Pr(2), and two equivalent Cu(1) atoms to form distorted OPr4Cu2 octahedra that share corners with two equivalent O(1)Pr4Cu2 octahedra, corners with two equivalent O(5)Sr5Cu octahedra, corners with four equivalent O(2)Sr2Pr2Cu2 octahedra, corners with four equivalent O(3)Sr2Pr2Cu2 octahedra, edges with three equivalent O(1)Pr4Cu2 octahedra, faces with two equivalent O(3)Sr2Pr2Cu2 octahedra, and faces with four equivalent O(2)Sr2Pr2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-65°.