Sr2Fe3Al4P4(H2O13)2 crystallizes in the triclinic P-1 space group. Sr(1) is bonded in a 9-coordinate geometry to one O(11), one O(12), one O(13), one O(4), one O(8), two equivalent O(10), and two equivalent O(5) atoms. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(11), two equivalent O(6), and two equivalent O(7) atoms to form distorted FeO6 octahedra that share corners with two equivalent P(2)O4 tetrahedra and edges with four equivalent Al(1)O6 octahedra. In the second Fe site, Fe(2) is bonded to one O(10), one O(2), one O(3), one O(4), one O(5), and one O(9) atom to form FeO6 octahedra that share  a cornercorner with one Al(2)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and  an edgeedge with one Al(3)O6 octahedra. The corner-sharing octahedral tilt angles are 51°. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(11), one O(12), one O(6), one O(8), and two equivalent O(7) atoms to form AlO6 octahedra that share  a cornercorner with one Al(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  an edgeedge with one Al(1)O6 octahedra, and edges with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles are 43°. In the second Al site, Al(2) is bonded to two equivalent O(12), two equivalent O(13), and two equivalent O(4) atoms to form AlO6 octahedra that share corners with two equivalent Fe(2)O6 octahedra, corners with two equivalent Al(1)O6 octahedra, and corners with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 43-51°. In the third Al site, Al(3) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form AlO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and edges with two equivalent Fe(2)O6 octahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(10), one O(5), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(3)O6 octahedra, and corners with two equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-53°. In the second P site, P(2) is bonded to one O(13), one O(2), one O(6), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(2)O6 octahedra,  a cornercorner with one Al(3)O6 octahedra, and corners with two equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-56°. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(12) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(3) atom. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Al(3) and one P(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Fe(2), one Al(3), and one P(2) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Fe(2), one Al(3), and one H(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sr(1), one Fe(2), and one Al(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Fe(2), and one P(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Fe(1), one Al(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a trigonal non-coplanar geometry to one Fe(1) and two equivalent Al(1) atoms. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Sr(1), one Al(1), and one P(1) atom. In the ninth O site, O(9) is bonded in a 2-coordinate geometry to one Fe(2) and one P(2) atom. In the tenth O site, O(10) is bonded in a 2-coordinate geometry to two equivalent Sr(1), one Fe(2), and one P(1) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one Fe(1), and one Al(1) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one Sr(1), one Al(1), one Al(2), and one H(1) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 120 degrees geometry to one Sr(1), one Al(2), and one P(2) atom.
Sr2Fe3Al4P4(H2O13)2 crystallizes in the triclinic P-1 space group. Sr(1) is bonded in a 9-coordinate geometry to one O(11), one O(12), one O(13), one O(4), one O(8), two equivalent O(10), and two equivalent O(5) atoms. The Sr(1)-O(11) bond length is 2.65 Å. The Sr(1)-O(12) bond length is 2.64 Å. The Sr(1)-O(13) bond length is 2.75 Å. The Sr(1)-O(4) bond length is 2.71 Å. The Sr(1)-O(8) bond length is 2.68 Å. There is one shorter (3.01 Å) and one longer (3.07 Å) Sr(1)-O(10) bond length. There is one shorter (2.59 Å) and one longer (2.85 Å) Sr(1)-O(5) bond length. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(11), two equivalent O(6), and two equivalent O(7) atoms to form distorted FeO6 octahedra that share corners with two equivalent P(2)O4 tetrahedra and edges with four equivalent Al(1)O6 octahedra. Both Fe(1)-O(11) bond lengths are 1.87 Å. Both Fe(1)-O(6) bond lengths are 2.23 Å. Both Fe(1)-O(7) bond lengths are 1.95 Å. In the second Fe site, Fe(2) is bonded to one O(10), one O(2), one O(3), one O(4), one O(5), and one O(9) atom to form FeO6 octahedra that share  a cornercorner with one Al(2)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and  an edgeedge with one Al(3)O6 octahedra. The corner-sharing octahedral tilt angles are 51°. The Fe(2)-O(10) bond length is 2.09 Å. The Fe(2)-O(2) bond length is 2.14 Å. The Fe(2)-O(3) bond length is 2.00 Å. The Fe(2)-O(4) bond length is 1.91 Å. The Fe(2)-O(5) bond length is 2.03 Å. The Fe(2)-O(9) bond length is 2.07 Å. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(11), one O(12), one O(6), one O(8), and two equivalent O(7) atoms to form AlO6 octahedra that share  a cornercorner with one Al(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  an edgeedge with one Al(1)O6 octahedra, and edges with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles are 43°. The Al(1)-O(11) bond length is 1.90 Å. The Al(1)-O(12) bond length is 1.94 Å. The Al(1)-O(6) bond length is 1.95 Å. The Al(1)-O(8) bond length is 1.86 Å. There is one shorter (1.92 Å) and one longer (1.97 Å) Al(1)-O(7) bond length. In the second Al site, Al(2) is bonded to two equivalent O(12), two equivalent O(13), and two equivalent O(4) atoms to form AlO6 octahedra that share corners with two equivalent Fe(2)O6 octahedra, corners with two equivalent Al(1)O6 octahedra, and corners with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 43-51°. Both Al(2)-O(12) bond lengths are 1.99 Å. Both Al(2)-O(13) bond lengths are 1.94 Å. Both Al(2)-O(4) bond lengths are 1.89 Å. In the third Al site, Al(3) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form AlO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and edges with two equivalent Fe(2)O6 octahedra. Both Al(3)-O(1) bond lengths are 1.89 Å. Both Al(3)-O(2) bond lengths are 1.99 Å. Both Al(3)-O(3) bond lengths are 1.84 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(10), one O(5), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(3)O6 octahedra, and corners with two equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-53°. The P(1)-O(1) bond length is 1.53 Å. The P(1)-O(10) bond length is 1.55 Å. The P(1)-O(5) bond length is 1.57 Å. The P(1)-O(8) bond length is 1.56 Å. In the second P site, P(2) is bonded to one O(13), one O(2), one O(6), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(2)O6 octahedra,  a cornercorner with one Al(3)O6 octahedra, and corners with two equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-56°. The P(2)-O(13) bond length is 1.54 Å. The P(2)-O(2) bond length is 1.56 Å. The P(2)-O(6) bond length is 1.58 Å. The P(2)-O(9) bond length is 1.53 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(12) atom. The H(1)-O(12) bond length is 0.99 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(3) atom. The H(2)-O(3) bond length is 0.98 Å. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Al(3) and one P(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Fe(2), one Al(3), and one P(2) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Fe(2), one Al(3), and one H(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sr(1), one Fe(2), and one Al(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Fe(2), and one P(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Fe(1), one Al(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a trigonal non-coplanar geometry to one Fe(1) and two equivalent Al(1) atoms. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Sr(1), one Al(1), and one P(1) atom. In the ninth O site, O(9) is bonded in a 2-coordinate geometry to one Fe(2) and one P(2) atom. In the tenth O site, O(10) is bonded in a 2-coordinate geometry to two equivalent Sr(1), one Fe(2), and one P(1) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one Fe(1), and one Al(1) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one Sr(1), one Al(1), one Al(2), and one H(1) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 120 degrees geometry to one Sr(1), one Al(2), and one P(2) atom.