Sr2PrMn3O9 crystallizes in the monoclinic C2/c space group. Sr(1) is bonded to one O(5), two equivalent O(2), three equivalent O(1), three equivalent O(3), and three equivalent O(4) atoms to form distorted SrO12 cuboctahedra that share corners with nine equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Mn(2)O6 octahedra, and faces with five equivalent Mn(1)O6 octahedra. Pr(1) is bonded in a 12-coordinate geometry to two equivalent O(1), two equivalent O(3), two equivalent O(4), two equivalent O(5), and four equivalent O(2) atoms. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(3), one O(4), one O(5), and two equivalent O(2) atoms to form MnO6 octahedra that share corners with three equivalent Mn(1)O6 octahedra, corners with three equivalent Mn(2)O6 octahedra, and faces with five equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 2-20°. In the second Mn site, Mn(2) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form MnO6 octahedra that share corners with six equivalent Mn(1)O6 octahedra and faces with six equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 4-20°. There are five inequivalent O sites. In the first O site, O(4) is bonded to three equivalent Sr(1), one Pr(1), one Mn(1), and one Mn(2) atom to form distorted OSr3PrMn2 octahedra that share corners with two equivalent O(5)Sr2Pr2Mn2 octahedra, corners with four equivalent O(4)Sr3PrMn2 octahedra, edges with two equivalent O(5)Sr2Pr2Mn2 octahedra, and edges with two equivalent O(4)Sr3PrMn2 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the second O site, O(5) is bonded to two equivalent Sr(1), two equivalent Pr(1), and two equivalent Mn(1) atoms to form distorted OSr2Pr2Mn2 octahedra that share corners with two equivalent O(5)Sr2Pr2Mn2 octahedra, corners with four equivalent O(4)Sr3PrMn2 octahedra, and edges with four equivalent O(4)Sr3PrMn2 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the third O site, O(1) is bonded in a 4-coordinate geometry to three equivalent Sr(1), one Pr(1), one Mn(1), and one Mn(2) atom. In the fourth O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent Pr(1), and two equivalent Mn(1) atoms. In the fifth O site, O(3) is bonded in a 2-coordinate geometry to three equivalent Sr(1), one Pr(1), one Mn(1), and one Mn(2) atom.
Sr2PrMn3O9 crystallizes in the monoclinic C2/c space group. Sr(1) is bonded to one O(5), two equivalent O(2), three equivalent O(1), three equivalent O(3), and three equivalent O(4) atoms to form distorted SrO12 cuboctahedra that share corners with nine equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Mn(2)O6 octahedra, and faces with five equivalent Mn(1)O6 octahedra. The Sr(1)-O(5) bond length is 2.74 Å. There is one shorter (2.60 Å) and one longer (2.98 Å) Sr(1)-O(2) bond length. There are a spread of Sr(1)-O(1) bond distances ranging from 2.59-3.05 Å. There are a spread of Sr(1)-O(3) bond distances ranging from 2.58-2.97 Å. There are a spread of Sr(1)-O(4) bond distances ranging from 2.72-2.80 Å. Pr(1) is bonded in a 12-coordinate geometry to two equivalent O(1), two equivalent O(3), two equivalent O(4), two equivalent O(5), and four equivalent O(2) atoms. Both Pr(1)-O(1) bond lengths are 2.51 Å. Both Pr(1)-O(3) bond lengths are 2.94 Å. Both Pr(1)-O(4) bond lengths are 2.66 Å. There is one shorter (2.72 Å) and one longer (2.74 Å) Pr(1)-O(5) bond length. There are two shorter (2.48 Å) and two longer (3.07 Å) Pr(1)-O(2) bond lengths. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(3), one O(4), one O(5), and two equivalent O(2) atoms to form MnO6 octahedra that share corners with three equivalent Mn(1)O6 octahedra, corners with three equivalent Mn(2)O6 octahedra, and faces with five equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 2-20°. The Mn(1)-O(1) bond length is 1.95 Å. The Mn(1)-O(3) bond length is 1.94 Å. The Mn(1)-O(4) bond length is 1.96 Å. The Mn(1)-O(5) bond length is 1.99 Å. There is one shorter (1.96 Å) and one longer (1.97 Å) Mn(1)-O(2) bond length. In the second Mn site, Mn(2) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form MnO6 octahedra that share corners with six equivalent Mn(1)O6 octahedra and faces with six equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 4-20°. Both Mn(2)-O(1) bond lengths are 1.97 Å. Both Mn(2)-O(3) bond lengths are 1.95 Å. Both Mn(2)-O(4) bond lengths are 2.00 Å. There are five inequivalent O sites. In the first O site, O(4) is bonded to three equivalent Sr(1), one Pr(1), one Mn(1), and one Mn(2) atom to form distorted OSr3PrMn2 octahedra that share corners with two equivalent O(5)Sr2Pr2Mn2 octahedra, corners with four equivalent O(4)Sr3PrMn2 octahedra, edges with two equivalent O(5)Sr2Pr2Mn2 octahedra, and edges with two equivalent O(4)Sr3PrMn2 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the second O site, O(5) is bonded to two equivalent Sr(1), two equivalent Pr(1), and two equivalent Mn(1) atoms to form distorted OSr2Pr2Mn2 octahedra that share corners with two equivalent O(5)Sr2Pr2Mn2 octahedra, corners with four equivalent O(4)Sr3PrMn2 octahedra, and edges with four equivalent O(4)Sr3PrMn2 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the third O site, O(1) is bonded in a 4-coordinate geometry to three equivalent Sr(1), one Pr(1), one Mn(1), and one Mn(2) atom. In the fourth O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent Pr(1), and two equivalent Mn(1) atoms. In the fifth O site, O(3) is bonded in a 2-coordinate geometry to three equivalent Sr(1), one Pr(1), one Mn(1), and one Mn(2) atom.