Sr2V2O7 crystallizes in the triclinic P-1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(12), one O(14), one O(2), one O(4), one O(6), and one O(7) atom. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(10), one O(13), one O(14), one O(2), one O(7), one O(8), one O(9), and two equivalent O(5) atoms. In the third Sr site, Sr(3) is bonded in a 9-coordinate geometry to one O(10), one O(13), one O(14), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(8) atom. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(4), one O(6), one O(7), one O(9), and two equivalent O(12) atoms. There are four inequivalent V sites. In the first V site, V(1) is bonded to one O(11), one O(12), one O(7), and one O(9) atom to form corner-sharing VO4 tetrahedra. In the second V site, V(2) is bonded to one O(14), one O(3), one O(5), and one O(8) atom to form corner-sharing VO4 tetrahedra. In the third V site, V(3) is bonded to one O(10), one O(13), one O(3), and one O(4) atom to form corner-sharing VO4 tetrahedra. In the fourth V site, V(4) is bonded to one O(1), one O(11), one O(2), and one O(6) atom to form corner-sharing VO4 tetrahedra. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Sr(1), one Sr(4), and one V(4) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), one Sr(3), and one V(4) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Sr(3), one V(2), and one V(3) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(3), one Sr(4), and one V(3) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(3), two equivalent Sr(2), and one V(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(3), one Sr(4), and one V(4) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), one Sr(4), and one V(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(3), and one V(2) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Sr(2), one Sr(4), and one V(1) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(3), one Sr(4), and one V(3) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Sr(1), one V(1), and one V(4) atom. In the twelfth O site, O(12) is bonded to one Sr(1), two equivalent Sr(4), and one V(1) atom to form distorted edge-sharing OSr3V tetrahedra. In the thirteenth O site, O(13) is bonded in a distorted trigonal non-coplanar geometry to one Sr(2), one Sr(3), and one V(3) atom. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), one Sr(3), and one V(2) atom.
Sr2V2O7 crystallizes in the triclinic P-1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(12), one O(14), one O(2), one O(4), one O(6), and one O(7) atom. The Sr(1)-O(1) bond length is 2.64 Å. The Sr(1)-O(11) bond length is 2.69 Å. The Sr(1)-O(12) bond length is 2.57 Å. The Sr(1)-O(14) bond length is 2.54 Å. The Sr(1)-O(2) bond length is 2.75 Å. The Sr(1)-O(4) bond length is 2.85 Å. The Sr(1)-O(6) bond length is 2.55 Å. The Sr(1)-O(7) bond length is 2.69 Å. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(10), one O(13), one O(14), one O(2), one O(7), one O(8), one O(9), and two equivalent O(5) atoms. The Sr(2)-O(10) bond length is 2.66 Å. The Sr(2)-O(13) bond length is 2.53 Å. The Sr(2)-O(14) bond length is 2.84 Å. The Sr(2)-O(2) bond length is 2.70 Å. The Sr(2)-O(7) bond length is 2.94 Å. The Sr(2)-O(8) bond length is 2.65 Å. The Sr(2)-O(9) bond length is 2.65 Å. There is one shorter (2.64 Å) and one longer (2.70 Å) Sr(2)-O(5) bond length. In the third Sr site, Sr(3) is bonded in a 9-coordinate geometry to one O(10), one O(13), one O(14), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(8) atom. The Sr(3)-O(10) bond length is 2.62 Å. The Sr(3)-O(13) bond length is 2.55 Å. The Sr(3)-O(14) bond length is 2.62 Å. The Sr(3)-O(2) bond length is 2.82 Å. The Sr(3)-O(3) bond length is 2.64 Å. The Sr(3)-O(4) bond length is 3.00 Å. The Sr(3)-O(5) bond length is 2.54 Å. The Sr(3)-O(6) bond length is 2.68 Å. The Sr(3)-O(8) bond length is 3.22 Å. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(4), one O(6), one O(7), one O(9), and two equivalent O(12) atoms. The Sr(4)-O(1) bond length is 2.48 Å. The Sr(4)-O(10) bond length is 2.71 Å. The Sr(4)-O(4) bond length is 2.57 Å. The Sr(4)-O(6) bond length is 2.74 Å. The Sr(4)-O(7) bond length is 2.90 Å. The Sr(4)-O(9) bond length is 2.53 Å. There is one shorter (2.55 Å) and one longer (2.57 Å) Sr(4)-O(12) bond length. There are four inequivalent V sites. In the first V site, V(1) is bonded to one O(11), one O(12), one O(7), and one O(9) atom to form corner-sharing VO4 tetrahedra. The V(1)-O(11) bond length is 1.82 Å. The V(1)-O(12) bond length is 1.71 Å. The V(1)-O(7) bond length is 1.68 Å. The V(1)-O(9) bond length is 1.69 Å. In the second V site, V(2) is bonded to one O(14), one O(3), one O(5), and one O(8) atom to form corner-sharing VO4 tetrahedra. The V(2)-O(14) bond length is 1.71 Å. The V(2)-O(3) bond length is 1.82 Å. The V(2)-O(5) bond length is 1.71 Å. The V(2)-O(8) bond length is 1.67 Å. In the third V site, V(3) is bonded to one O(10), one O(13), one O(3), and one O(4) atom to form corner-sharing VO4 tetrahedra. The V(3)-O(10) bond length is 1.72 Å. The V(3)-O(13) bond length is 1.68 Å. The V(3)-O(3) bond length is 1.81 Å. The V(3)-O(4) bond length is 1.68 Å. In the fourth V site, V(4) is bonded to one O(1), one O(11), one O(2), and one O(6) atom to form corner-sharing VO4 tetrahedra. The V(4)-O(1) bond length is 1.68 Å. The V(4)-O(11) bond length is 1.81 Å. The V(4)-O(2) bond length is 1.69 Å. The V(4)-O(6) bond length is 1.71 Å. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Sr(1), one Sr(4), and one V(4) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), one Sr(3), and one V(4) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Sr(3), one V(2), and one V(3) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(3), one Sr(4), and one V(3) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(3), two equivalent Sr(2), and one V(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(3), one Sr(4), and one V(4) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), one Sr(4), and one V(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(3), and one V(2) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Sr(2), one Sr(4), and one V(1) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(3), one Sr(4), and one V(3) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Sr(1), one V(1), and one V(4) atom. In the twelfth O site, O(12) is bonded to one Sr(1), two equivalent Sr(4), and one V(1) atom to form distorted edge-sharing OSr3V tetrahedra. In the thirteenth O site, O(13) is bonded in a distorted trigonal non-coplanar geometry to one Sr(2), one Sr(3), and one V(3) atom. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), one Sr(3), and one V(2) atom.