Sr2PrO4 crystallizes in the orthorhombic Pbam space group. Sr(1) is bonded in a 7-coordinate geometry to three equivalent O(2) and four equivalent O(1) atoms. Pr(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form edge-sharing PrO6 octahedra. There are two inequivalent O sites. In the first O site, O(2) is bonded to three equivalent Sr(1) and two equivalent Pr(1) atoms to form distorted OSr3Pr2 trigonal bipyramids that share corners with four equivalent O(1)Sr4Pr square pyramids, corners with eight equivalent O(2)Sr3Pr2 trigonal bipyramids, edges with six equivalent O(1)Sr4Pr square pyramids, and edges with two equivalent O(2)Sr3Pr2 trigonal bipyramids. In the second O site, O(1) is bonded to four equivalent Sr(1) and one Pr(1) atom to form distorted OSr4Pr square pyramids that share corners with five equivalent O(1)Sr4Pr square pyramids, corners with four equivalent O(2)Sr3Pr2 trigonal bipyramids, edges with four equivalent O(1)Sr4Pr square pyramids, and edges with six equivalent O(2)Sr3Pr2 trigonal bipyramids.
Sr2PrO4 crystallizes in the orthorhombic Pbam space group. Sr(1) is bonded in a 7-coordinate geometry to three equivalent O(2) and four equivalent O(1) atoms. There are a spread of Sr(1)-O(2) bond distances ranging from 2.48-3.09 Å. There are two shorter (2.60 Å) and two longer (2.61 Å) Sr(1)-O(1) bond lengths. Pr(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form edge-sharing PrO6 octahedra. Both Pr(1)-O(1) bond lengths are 2.34 Å. All Pr(1)-O(2) bond lengths are 2.43 Å. There are two inequivalent O sites. In the first O site, O(2) is bonded to three equivalent Sr(1) and two equivalent Pr(1) atoms to form distorted OSr3Pr2 trigonal bipyramids that share corners with four equivalent O(1)Sr4Pr square pyramids, corners with eight equivalent O(2)Sr3Pr2 trigonal bipyramids, edges with six equivalent O(1)Sr4Pr square pyramids, and edges with two equivalent O(2)Sr3Pr2 trigonal bipyramids. In the second O site, O(1) is bonded to four equivalent Sr(1) and one Pr(1) atom to form distorted OSr4Pr square pyramids that share corners with five equivalent O(1)Sr4Pr square pyramids, corners with four equivalent O(2)Sr3Pr2 trigonal bipyramids, edges with four equivalent O(1)Sr4Pr square pyramids, and edges with six equivalent O(2)Sr3Pr2 trigonal bipyramids.