Sr2MgV2(Si2O7)2 crystallizes in the triclinic P1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 10-coordinate geometry to one O(10), one O(11), one O(12), one O(13), one O(14), one O(6), one O(7), one O(8), and two equivalent O(1) atoms. In the second Sr site, Sr(2) is bonded in a 10-coordinate geometry to one O(11), one O(12), one O(13), one O(14), one O(5), one O(7), one O(8), one O(9), and two equivalent O(2) atoms. Mg(1) is bonded in a 5-coordinate geometry to one O(10), one O(3), one O(5), one O(6), and one O(9) atom. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(10), one O(12), one O(13), one O(5), and one O(8) atom to form distorted VO5 trigonal bipyramids that share corners with two equivalent Si(1)O4 tetrahedra and corners with two equivalent Si(4)O4 tetrahedra. In the second V site, V(2) is bonded to one O(11), one O(14), one O(6), one O(7), and one O(9) atom to form distorted VO5 trigonal bipyramids that share corners with two equivalent Si(2)O4 tetrahedra and corners with two equivalent Si(3)O4 tetrahedra. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(13), one O(2), one O(3), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and corners with two equivalent V(1)O5 trigonal bipyramids. In the second Si site, Si(2) is bonded to one O(1), one O(14), one O(3), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and corners with two equivalent V(2)O5 trigonal bipyramids. In the third Si site, Si(3) is bonded to one O(1), one O(11), one O(4), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and corners with two equivalent V(2)O5 trigonal bipyramids. In the fourth Si site, Si(4) is bonded to one O(12), one O(2), one O(4), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and corners with two equivalent V(1)O5 trigonal bipyramids. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Sr(1), one Si(2), and one Si(3) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent Sr(2), one Si(1), and one Si(4) atom. In the third O site, O(3) is bonded in a T-shaped geometry to one Mg(1), one Si(1), and one Si(2) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Si(3) and one Si(4) atom. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to one Sr(2), one Mg(1), one V(1), and one Si(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(1), one Mg(1), one V(2), and one Si(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one V(2), and one Si(3) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one V(1), and one Si(4) atom. In the ninth O site, O(9) is bonded in a distorted T-shaped geometry to one Sr(2), one Mg(1), and one V(2) atom. In the tenth O site, O(10) is bonded in a distorted T-shaped geometry to one Sr(1), one Mg(1), and one V(1) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one V(2), and one Si(3) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one V(1), and one Si(4) atom. In the thirteenth O site, O(13) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(2), one V(1), and one Si(1) atom. In the fourteenth O site, O(14) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(2), one V(2), and one Si(2) atom.
Sr2MgV2(Si2O7)2 crystallizes in the triclinic P1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 10-coordinate geometry to one O(10), one O(11), one O(12), one O(13), one O(14), one O(6), one O(7), one O(8), and two equivalent O(1) atoms. The Sr(1)-O(10) bond length is 2.70 Å. The Sr(1)-O(11) bond length is 2.64 Å. The Sr(1)-O(12) bond length is 2.89 Å. The Sr(1)-O(13) bond length is 3.06 Å. The Sr(1)-O(14) bond length is 2.74 Å. The Sr(1)-O(6) bond length is 2.73 Å. The Sr(1)-O(7) bond length is 2.65 Å. The Sr(1)-O(8) bond length is 2.73 Å. There is one shorter (2.85 Å) and one longer (2.95 Å) Sr(1)-O(1) bond length. In the second Sr site, Sr(2) is bonded in a 10-coordinate geometry to one O(11), one O(12), one O(13), one O(14), one O(5), one O(7), one O(8), one O(9), and two equivalent O(2) atoms. The Sr(2)-O(11) bond length is 2.79 Å. The Sr(2)-O(12) bond length is 2.63 Å. The Sr(2)-O(13) bond length is 2.79 Å. The Sr(2)-O(14) bond length is 3.23 Å. The Sr(2)-O(5) bond length is 2.70 Å. The Sr(2)-O(7) bond length is 2.81 Å. The Sr(2)-O(8) bond length is 2.65 Å. The Sr(2)-O(9) bond length is 2.69 Å. There is one shorter (2.87 Å) and one longer (2.91 Å) Sr(2)-O(2) bond length. Mg(1) is bonded in a 5-coordinate geometry to one O(10), one O(3), one O(5), one O(6), and one O(9) atom. The Mg(1)-O(10) bond length is 1.92 Å. The Mg(1)-O(3) bond length is 2.21 Å. The Mg(1)-O(5) bond length is 2.11 Å. The Mg(1)-O(6) bond length is 2.11 Å. The Mg(1)-O(9) bond length is 1.92 Å. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(10), one O(12), one O(13), one O(5), and one O(8) atom to form distorted VO5 trigonal bipyramids that share corners with two equivalent Si(1)O4 tetrahedra and corners with two equivalent Si(4)O4 tetrahedra. The V(1)-O(10) bond length is 1.84 Å. The V(1)-O(12) bond length is 2.04 Å. The V(1)-O(13) bond length is 2.10 Å. The V(1)-O(5) bond length is 2.17 Å. The V(1)-O(8) bond length is 2.02 Å. In the second V site, V(2) is bonded to one O(11), one O(14), one O(6), one O(7), and one O(9) atom to form distorted VO5 trigonal bipyramids that share corners with two equivalent Si(2)O4 tetrahedra and corners with two equivalent Si(3)O4 tetrahedra. The V(2)-O(11) bond length is 2.05 Å. The V(2)-O(14) bond length is 2.09 Å. The V(2)-O(6) bond length is 2.18 Å. The V(2)-O(7) bond length is 2.02 Å. The V(2)-O(9) bond length is 1.85 Å. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(13), one O(2), one O(3), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and corners with two equivalent V(1)O5 trigonal bipyramids. The Si(1)-O(13) bond length is 1.61 Å. The Si(1)-O(2) bond length is 1.67 Å. The Si(1)-O(3) bond length is 1.64 Å. The Si(1)-O(5) bond length is 1.63 Å. In the second Si site, Si(2) is bonded to one O(1), one O(14), one O(3), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and corners with two equivalent V(2)O5 trigonal bipyramids. The Si(2)-O(1) bond length is 1.67 Å. The Si(2)-O(14) bond length is 1.61 Å. The Si(2)-O(3) bond length is 1.64 Å. The Si(2)-O(6) bond length is 1.63 Å. In the third Si site, Si(3) is bonded to one O(1), one O(11), one O(4), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and corners with two equivalent V(2)O5 trigonal bipyramids. The Si(3)-O(1) bond length is 1.68 Å. The Si(3)-O(11) bond length is 1.64 Å. The Si(3)-O(4) bond length is 1.62 Å. The Si(3)-O(7) bond length is 1.62 Å. In the fourth Si site, Si(4) is bonded to one O(12), one O(2), one O(4), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and corners with two equivalent V(1)O5 trigonal bipyramids. The Si(4)-O(12) bond length is 1.63 Å. The Si(4)-O(2) bond length is 1.68 Å. The Si(4)-O(4) bond length is 1.62 Å. The Si(4)-O(8) bond length is 1.62 Å. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Sr(1), one Si(2), and one Si(3) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent Sr(2), one Si(1), and one Si(4) atom. In the third O site, O(3) is bonded in a T-shaped geometry to one Mg(1), one Si(1), and one Si(2) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Si(3) and one Si(4) atom. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to one Sr(2), one Mg(1), one V(1), and one Si(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(1), one Mg(1), one V(2), and one Si(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one V(2), and one Si(3) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one V(1), and one Si(4) atom. In the ninth O site, O(9) is bonded in a distorted T-shaped geometry to one Sr(2), one Mg(1), and one V(2) atom. In the tenth O site, O(10) is bonded in a distorted T-shaped geometry to one Sr(1), one Mg(1), and one V(1) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one V(2), and one Si(3) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one V(1), and one Si(4) atom. In the thirteenth O site, O(13) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(2), one V(1), and one Si(1) atom. In the fourteenth O site, O(14) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(2), one V(2), and one Si(2) atom.