SrPrInO4 crystallizes in the orthorhombic P2_12_12_1 space group. Sr(1) is bonded in a 6-coordinate geometry to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms. Pr(1) is bonded in a 6-coordinate geometry to one O(2), one O(3), two equivalent O(1), and two equivalent O(4) atoms. In(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form corner-sharing InO6 octahedra. The corner-sharing octahedral tilt angles range from 24-35°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Sr(1), two equivalent Pr(1), and two equivalent In(1) atoms. In the second O site, O(2) is bonded to two equivalent Sr(1), one Pr(1), and two equivalent In(1) atoms to form distorted OSr2PrIn2 trigonal bipyramids that share corners with three equivalent O(3)Sr2PrIn tetrahedra, corners with four equivalent O(4)SrPr2In tetrahedra,  an edgeedge with one O(4)SrPr2In tetrahedra, edges with two equivalent O(3)Sr2PrIn tetrahedra, and edges with two equivalent O(2)Sr2PrIn2 trigonal bipyramids. In the third O site, O(3) is bonded to two equivalent Sr(1), one Pr(1), and one In(1) atom to form distorted OSr2PrIn tetrahedra that share corners with two equivalent O(3)Sr2PrIn tetrahedra, corners with five equivalent O(4)SrPr2In tetrahedra, corners with three equivalent O(2)Sr2PrIn2 trigonal bipyramids, and edges with two equivalent O(2)Sr2PrIn2 trigonal bipyramids. In the fourth O site, O(4) is bonded to one Sr(1), two equivalent Pr(1), and one In(1) atom to form OSrPr2In tetrahedra that share corners with two equivalent O(4)SrPr2In tetrahedra, corners with five equivalent O(3)Sr2PrIn tetrahedra, corners with four equivalent O(2)Sr2PrIn2 trigonal bipyramids, and  an edgeedge with one O(2)Sr2PrIn2 trigonal bipyramid.
SrPrInO4 crystallizes in the orthorhombic P2_12_12_1 space group. Sr(1) is bonded in a 6-coordinate geometry to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms. The Sr(1)-O(1) bond length is 2.53 Å. The Sr(1)-O(4) bond length is 2.53 Å. Both Sr(1)-O(2) bond lengths are 2.78 Å. There is one shorter (2.44 Å) and one longer (2.62 Å) Sr(1)-O(3) bond length. Pr(1) is bonded in a 6-coordinate geometry to one O(2), one O(3), two equivalent O(1), and two equivalent O(4) atoms. The Pr(1)-O(2) bond length is 2.40 Å. The Pr(1)-O(3) bond length is 2.33 Å. There is one shorter (2.64 Å) and one longer (2.73 Å) Pr(1)-O(1) bond length. There is one shorter (2.33 Å) and one longer (2.43 Å) Pr(1)-O(4) bond length. In(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form corner-sharing InO6 octahedra. The corner-sharing octahedral tilt angles range from 24-35°. The In(1)-O(3) bond length is 2.21 Å. The In(1)-O(4) bond length is 2.30 Å. Both In(1)-O(1) bond lengths are 2.20 Å. There is one shorter (2.18 Å) and one longer (2.20 Å) In(1)-O(2) bond length. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Sr(1), two equivalent Pr(1), and two equivalent In(1) atoms. In the second O site, O(2) is bonded to two equivalent Sr(1), one Pr(1), and two equivalent In(1) atoms to form distorted OSr2PrIn2 trigonal bipyramids that share corners with three equivalent O(3)Sr2PrIn tetrahedra, corners with four equivalent O(4)SrPr2In tetrahedra,  an edgeedge with one O(4)SrPr2In tetrahedra, edges with two equivalent O(3)Sr2PrIn tetrahedra, and edges with two equivalent O(2)Sr2PrIn2 trigonal bipyramids. In the third O site, O(3) is bonded to two equivalent Sr(1), one Pr(1), and one In(1) atom to form distorted OSr2PrIn tetrahedra that share corners with two equivalent O(3)Sr2PrIn tetrahedra, corners with five equivalent O(4)SrPr2In tetrahedra, corners with three equivalent O(2)Sr2PrIn2 trigonal bipyramids, and edges with two equivalent O(2)Sr2PrIn2 trigonal bipyramids. In the fourth O site, O(4) is bonded to one Sr(1), two equivalent Pr(1), and one In(1) atom to form OSrPr2In tetrahedra that share corners with two equivalent O(4)SrPr2In tetrahedra, corners with five equivalent O(3)Sr2PrIn tetrahedra, corners with four equivalent O(2)Sr2PrIn2 trigonal bipyramids, and  an edgeedge with one O(2)Sr2PrIn2 trigonal bipyramid.