Pr4Re6O19 crystallizes in the trigonal R3 space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 10-coordinate geometry to one O(2), one O(3), one O(4), one O(6), two equivalent O(1), two equivalent O(5), and two equivalent O(7) atoms. In the second Pr site, Pr(2) is bonded in a 10-coordinate geometry to one O(3), three equivalent O(2), three equivalent O(4), and three equivalent O(6) atoms. There are two inequivalent Re sites. In the first Re site, Re(1) is bonded to one O(1), one O(2), one O(4), one O(6), and two equivalent O(7) atoms to form a mixture of corner and edge-sharing ReO6 octahedra. The corner-sharing octahedral tilt angles range from 55-56°. In the second Re site, Re(2) is bonded to one O(1), one O(2), one O(4), one O(6), and two equivalent O(5) atoms to form a mixture of corner and edge-sharing ReO6 octahedra. The corner-sharing octahedral tilt angles range from 55-56°. There are seven inequivalent O sites. In the first O site, O(3) is bonded in a tetrahedral geometry to one Pr(2) and three equivalent Pr(1) atoms. In the second O site, O(4) is bonded in a 4-coordinate geometry to one Pr(1), one Pr(2), one Re(1), and one Re(2) atom. In the third O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Pr(1) and two equivalent Re(2) atoms. In the fourth O site, O(6) is bonded in a 4-coordinate geometry to one Pr(1), one Pr(2), one Re(1), and one Re(2) atom. In the fifth O site, O(7) is bonded in a 4-coordinate geometry to two equivalent Pr(1) and two equivalent Re(1) atoms. In the sixth O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Pr(1), one Re(1), and one Re(2) atom. In the seventh O site, O(2) is bonded in a 4-coordinate geometry to one Pr(1), one Pr(2), one Re(1), and one Re(2) atom.
Pr4Re6O19 crystallizes in the trigonal R3 space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 10-coordinate geometry to one O(2), one O(3), one O(4), one O(6), two equivalent O(1), two equivalent O(5), and two equivalent O(7) atoms. The Pr(1)-O(2) bond length is 2.49 Å. The Pr(1)-O(3) bond length is 2.46 Å. The Pr(1)-O(4) bond length is 2.93 Å. The Pr(1)-O(6) bond length is 2.58 Å. Both Pr(1)-O(1) bond lengths are 2.49 Å. There is one shorter (2.58 Å) and one longer (2.91 Å) Pr(1)-O(5) bond length. There is one shorter (2.58 Å) and one longer (2.93 Å) Pr(1)-O(7) bond length. In the second Pr site, Pr(2) is bonded in a 10-coordinate geometry to one O(3), three equivalent O(2), three equivalent O(4), and three equivalent O(6) atoms. The Pr(2)-O(3) bond length is 2.47 Å. All Pr(2)-O(2) bond lengths are 2.49 Å. All Pr(2)-O(4) bond lengths are 2.58 Å. All Pr(2)-O(6) bond lengths are 2.91 Å. There are two inequivalent Re sites. In the first Re site, Re(1) is bonded to one O(1), one O(2), one O(4), one O(6), and two equivalent O(7) atoms to form a mixture of corner and edge-sharing ReO6 octahedra. The corner-sharing octahedral tilt angles range from 55-56°. The Re(1)-O(1) bond length is 2.02 Å. The Re(1)-O(2) bond length is 2.02 Å. The Re(1)-O(4) bond length is 1.98 Å. The Re(1)-O(6) bond length is 1.99 Å. There is one shorter (1.98 Å) and one longer (1.99 Å) Re(1)-O(7) bond length. In the second Re site, Re(2) is bonded to one O(1), one O(2), one O(4), one O(6), and two equivalent O(5) atoms to form a mixture of corner and edge-sharing ReO6 octahedra. The corner-sharing octahedral tilt angles range from 55-56°. The Re(2)-O(1) bond length is 2.02 Å. The Re(2)-O(2) bond length is 2.02 Å. The Re(2)-O(4) bond length is 1.99 Å. The Re(2)-O(6) bond length is 1.98 Å. Both Re(2)-O(5) bond lengths are 1.99 Å. There are seven inequivalent O sites. In the first O site, O(3) is bonded in a tetrahedral geometry to one Pr(2) and three equivalent Pr(1) atoms. In the second O site, O(4) is bonded in a 4-coordinate geometry to one Pr(1), one Pr(2), one Re(1), and one Re(2) atom. In the third O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Pr(1) and two equivalent Re(2) atoms. In the fourth O site, O(6) is bonded in a 4-coordinate geometry to one Pr(1), one Pr(2), one Re(1), and one Re(2) atom. In the fifth O site, O(7) is bonded in a 4-coordinate geometry to two equivalent Pr(1) and two equivalent Re(1) atoms. In the sixth O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Pr(1), one Re(1), and one Re(2) atom. In the seventh O site, O(2) is bonded in a 4-coordinate geometry to one Pr(1), one Pr(2), one Re(1), and one Re(2) atom.