MgV6O15 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(14), one O(6), one O(9), and two equivalent O(8) atoms to form distorted corner-sharing MgO5 trigonal bipyramids. There are six inequivalent V sites. In the first V site, V(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(5), one O(9), and two equivalent O(12) atoms. In the second V site, V(2) is bonded in a 6-coordinate geometry to one O(11), one O(14), one O(15), one O(9), and two equivalent O(4) atoms. In the third V site, V(3) is bonded in a 5-coordinate geometry to one O(3), one O(5), one O(6), and two equivalent O(13) atoms. In the fourth V site, V(4) is bonded in a 6-coordinate geometry to one O(1), one O(4), one O(5), one O(7), and two equivalent O(15) atoms. In the fifth V site, V(5) is bonded in a 6-coordinate geometry to one O(11), one O(12), one O(15), one O(8), and two equivalent O(1) atoms. In the sixth V site, V(6) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(13), one O(14), and two equivalent O(3) atoms. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one V(1), one V(4), and two equivalent V(5) atoms. In the second O site, O(2) is bonded in a single-bond geometry to one V(1) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one V(3) and two equivalent V(6) atoms. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one V(4) and two equivalent V(2) atoms. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one V(1), one V(3), and one V(4) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one Mg(1) and one V(3) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one V(4) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to two equivalent Mg(1) and one V(5) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Mg(1), one V(1), and one V(2) atom. In the tenth O site, O(10) is bonded in a single-bond geometry to one V(6) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one V(2), one V(5), and one V(6) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal non-coplanar geometry to one V(5) and two equivalent V(1) atoms. In the thirteenth O site, O(13) is bonded in a distorted T-shaped geometry to one V(6) and two equivalent V(3) atoms. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Mg(1), one V(2), and one V(6) atom. In the fifteenth O site, O(15) is bonded to one V(2), one V(5), and two equivalent V(4) atoms to form distorted corner-sharing OV4 trigonal pyramids.
MgV6O15 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(14), one O(6), one O(9), and two equivalent O(8) atoms to form distorted corner-sharing MgO5 trigonal bipyramids. The Mg(1)-O(14) bond length is 2.00 Å. The Mg(1)-O(6) bond length is 2.23 Å. The Mg(1)-O(9) bond length is 2.27 Å. There is one shorter (2.08 Å) and one longer (2.11 Å) Mg(1)-O(8) bond length. There are six inequivalent V sites. In the first V site, V(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(5), one O(9), and two equivalent O(12) atoms. The V(1)-O(1) bond length is 2.22 Å. The V(1)-O(2) bond length is 1.63 Å. The V(1)-O(5) bond length is 2.35 Å. The V(1)-O(9) bond length is 1.77 Å. Both V(1)-O(12) bond lengths are 1.92 Å. In the second V site, V(2) is bonded in a 6-coordinate geometry to one O(11), one O(14), one O(15), one O(9), and two equivalent O(4) atoms. The V(2)-O(11) bond length is 2.07 Å. The V(2)-O(14) bond length is 1.72 Å. The V(2)-O(15) bond length is 2.30 Å. The V(2)-O(9) bond length is 2.03 Å. There is one shorter (1.90 Å) and one longer (2.00 Å) V(2)-O(4) bond length. In the third V site, V(3) is bonded in a 5-coordinate geometry to one O(3), one O(5), one O(6), and two equivalent O(13) atoms. The V(3)-O(3) bond length is 1.97 Å. The V(3)-O(5) bond length is 1.82 Å. The V(3)-O(6) bond length is 1.65 Å. There is one shorter (1.87 Å) and one longer (1.96 Å) V(3)-O(13) bond length. In the fourth V site, V(4) is bonded in a 6-coordinate geometry to one O(1), one O(4), one O(5), one O(7), and two equivalent O(15) atoms. The V(4)-O(1) bond length is 2.44 Å. The V(4)-O(4) bond length is 1.98 Å. The V(4)-O(5) bond length is 1.92 Å. The V(4)-O(7) bond length is 1.60 Å. There is one shorter (1.92 Å) and one longer (1.93 Å) V(4)-O(15) bond length. In the fifth V site, V(5) is bonded in a 6-coordinate geometry to one O(11), one O(12), one O(15), one O(8), and two equivalent O(1) atoms. The V(5)-O(11) bond length is 1.98 Å. The V(5)-O(12) bond length is 1.98 Å. The V(5)-O(15) bond length is 2.34 Å. The V(5)-O(8) bond length is 1.75 Å. There is one shorter (1.90 Å) and one longer (1.91 Å) V(5)-O(1) bond length. In the sixth V site, V(6) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(13), one O(14), and two equivalent O(3) atoms. The V(6)-O(10) bond length is 1.60 Å. The V(6)-O(11) bond length is 1.84 Å. The V(6)-O(13) bond length is 2.07 Å. The V(6)-O(14) bond length is 2.40 Å. Both V(6)-O(3) bond lengths are 1.92 Å. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one V(1), one V(4), and two equivalent V(5) atoms. In the second O site, O(2) is bonded in a single-bond geometry to one V(1) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one V(3) and two equivalent V(6) atoms. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one V(4) and two equivalent V(2) atoms. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one V(1), one V(3), and one V(4) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one Mg(1) and one V(3) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one V(4) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to two equivalent Mg(1) and one V(5) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Mg(1), one V(1), and one V(2) atom. In the tenth O site, O(10) is bonded in a single-bond geometry to one V(6) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one V(2), one V(5), and one V(6) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal non-coplanar geometry to one V(5) and two equivalent V(1) atoms. In the thirteenth O site, O(13) is bonded in a distorted T-shaped geometry to one V(6) and two equivalent V(3) atoms. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Mg(1), one V(2), and one V(6) atom. In the fifteenth O site, O(15) is bonded to one V(2), one V(5), and two equivalent V(4) atoms to form distorted corner-sharing OV4 trigonal pyramids.