MgHg8(W2O7)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 5-coordinate geometry to one O(12), one O(13), one O(14), one O(18), and one O(4) atom. There are eight inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(12), one O(18), one O(2), one O(21), and one O(5) atom to form a mixture of distorted edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 11-28°. In the second W site, W(2) is bonded to one O(11), one O(19), one O(25), one O(3), one O(6), and one O(9) atom to form a mixture of distorted edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 6-15°. In the third W site, W(3) is bonded to one O(10), one O(13), one O(2), one O(4), one O(5), and one O(7) atom to form a mixture of distorted edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 8-28°. In the fourth W site, W(4) is bonded to one O(15), one O(16), one O(17), one O(6), one O(8), and one O(9) atom to form a mixture of distorted edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 9-12°. In the fifth W site, W(5) is bonded to one O(12), one O(13), one O(14), one O(20), one O(21), and one O(23) atom to form a mixture of edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 8-28°. In the sixth W site, W(6) is bonded to one O(16), one O(19), one O(22), one O(24), one O(25), and one O(27) atom to form a mixture of distorted edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 9-15°. In the seventh W site, W(7) is bonded to one O(10), one O(18), one O(20), one O(23), one O(26), and one O(4) atom to form a mixture of distorted edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 10-28°. In the eighth W site, W(8) is bonded to one O(11), one O(17), one O(24), one O(27), one O(28), and one O(8) atom to form a mixture of distorted edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 6-12°. There are eight inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a distorted L-shaped geometry to one O(23) and one O(28) atom. In the second Hg site, Hg(2) is bonded in a single-bond geometry to one O(5) atom. In the third Hg site, Hg(3) is bonded in a 2-coordinate geometry to one O(7) and one O(9) atom. In the fourth Hg site, Hg(4) is bonded in a single-bond geometry to one O(2) atom. In the fifth Hg site, Hg(5) is bonded in a single-bond geometry to one O(27) atom. In the sixth Hg site, Hg(6) is bonded in a single-bond geometry to one O(20) atom. In the seventh Hg site, Hg(7) is bonded in a single-bond geometry to one O(24) atom. In the eighth Hg site, Hg(8) is bonded in a single-bond geometry to one O(6) atom. There are twenty-eight inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one W(1) atom. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one W(1), one W(3), and one Hg(4) atom. In the third O site, O(3) is bonded in a single-bond geometry to one W(2) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Mg(1), one W(3), and one W(7) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one W(1), one W(3), and one Hg(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one W(2), one W(4), and one Hg(8) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one W(3) and one Hg(3) atom. In the eighth O site, O(8) is bonded in a linear geometry to one W(4) and one W(8) atom. In the ninth O site, O(9) is bonded in a trigonal planar geometry to one W(2), one W(4), and one Hg(3) atom. In the tenth O site, O(10) is bonded in a linear geometry to one W(3) and one W(7) atom. In the eleventh O site, O(11) is bonded in a linear geometry to one W(2) and one W(8) atom. In the twelfth O site, O(12) is bonded in a T-shaped geometry to one Mg(1), one W(1), and one W(5) atom. In the thirteenth O site, O(13) is bonded in a T-shaped geometry to one Mg(1), one W(3), and one W(5) atom. In the fourteenth O site, O(14) is bonded in an L-shaped geometry to one Mg(1) and one W(5) atom. In the fifteenth O site, O(15) is bonded in a single-bond geometry to one W(4) atom. In the sixteenth O site, O(16) is bonded in a linear geometry to one W(4) and one W(6) atom. In the seventeenth O site, O(17) is bonded in a linear geometry to one W(4) and one W(8) atom. In the eighteenth O site, O(18) is bonded in a T-shaped geometry to one Mg(1), one W(1), and one W(7) atom. In the nineteenth O site, O(19) is bonded in a linear geometry to one W(2) and one W(6) atom. In the twentieth O site, O(20) is bonded in a trigonal planar geometry to one W(5), one W(7), and one Hg(6) atom. In the twenty-first O site, O(21) is bonded in a linear geometry to one W(1) and one W(5) atom. In the twenty-second O site, O(22) is bonded in a single-bond geometry to one W(6) atom. In the twenty-third O site, O(23) is bonded in a distorted trigonal planar geometry to one W(5), one W(7), and one Hg(1) atom. In the twenty-fourth O site, O(24) is bonded in a distorted trigonal planar geometry to one W(6), one W(8), and one Hg(7) atom. In the twenty-fifth O site, O(25) is bonded in a linear geometry to one W(2) and one W(6) atom. In the twenty-sixth O site, O(26) is bonded in a single-bond geometry to one W(7) atom. In the twenty-seventh O site, O(27) is bonded in a trigonal planar geometry to one W(6), one W(8), and one Hg(5) atom. In the twenty-eighth O site, O(28) is bonded in a distorted bent 150 degrees geometry to one W(8) and one Hg(1) atom.
MgHg8(W2O7)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 5-coordinate geometry to one O(12), one O(13), one O(14), one O(18), and one O(4) atom. The Mg(1)-O(12) bond length is 2.06 Å. The Mg(1)-O(13) bond length is 2.24 Å. The Mg(1)-O(14) bond length is 2.13 Å. The Mg(1)-O(18) bond length is 2.15 Å. The Mg(1)-O(4) bond length is 1.98 Å. There are eight inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(12), one O(18), one O(2), one O(21), and one O(5) atom to form a mixture of distorted edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 11-28°. The W(1)-O(1) bond length is 1.78 Å. The W(1)-O(12) bond length is 1.98 Å. The W(1)-O(18) bond length is 1.99 Å. The W(1)-O(2) bond length is 2.24 Å. The W(1)-O(21) bond length is 1.89 Å. The W(1)-O(5) bond length is 1.99 Å. In the second W site, W(2) is bonded to one O(11), one O(19), one O(25), one O(3), one O(6), and one O(9) atom to form a mixture of distorted edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 6-15°. The W(2)-O(11) bond length is 1.97 Å. The W(2)-O(19) bond length is 1.90 Å. The W(2)-O(25) bond length is 2.02 Å. The W(2)-O(3) bond length is 1.76 Å. The W(2)-O(6) bond length is 2.26 Å. The W(2)-O(9) bond length is 1.98 Å. In the third W site, W(3) is bonded to one O(10), one O(13), one O(2), one O(4), one O(5), and one O(7) atom to form a mixture of distorted edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 8-28°. The W(3)-O(10) bond length is 1.87 Å. The W(3)-O(13) bond length is 1.93 Å. The W(3)-O(2) bond length is 2.01 Å. The W(3)-O(4) bond length is 2.01 Å. The W(3)-O(5) bond length is 2.30 Å. The W(3)-O(7) bond length is 1.77 Å. In the fourth W site, W(4) is bonded to one O(15), one O(16), one O(17), one O(6), one O(8), and one O(9) atom to form a mixture of distorted edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 9-12°. The W(4)-O(15) bond length is 1.77 Å. The W(4)-O(16) bond length is 1.94 Å. The W(4)-O(17) bond length is 1.90 Å. The W(4)-O(6) bond length is 1.99 Å. The W(4)-O(8) bond length is 2.02 Å. The W(4)-O(9) bond length is 2.26 Å. In the fifth W site, W(5) is bonded to one O(12), one O(13), one O(14), one O(20), one O(21), and one O(23) atom to form a mixture of edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 8-28°. The W(5)-O(12) bond length is 2.07 Å. The W(5)-O(13) bond length is 2.07 Å. The W(5)-O(14) bond length is 1.85 Å. The W(5)-O(20) bond length is 2.07 Å. The W(5)-O(21) bond length is 1.99 Å. The W(5)-O(23) bond length is 2.00 Å. In the sixth W site, W(6) is bonded to one O(16), one O(19), one O(22), one O(24), one O(25), and one O(27) atom to form a mixture of distorted edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 9-15°. The W(6)-O(16) bond length is 1.94 Å. The W(6)-O(19) bond length is 2.01 Å. The W(6)-O(22) bond length is 1.76 Å. The W(6)-O(24) bond length is 2.24 Å. The W(6)-O(25) bond length is 1.90 Å. The W(6)-O(27) bond length is 2.00 Å. In the seventh W site, W(7) is bonded to one O(10), one O(18), one O(20), one O(23), one O(26), and one O(4) atom to form a mixture of distorted edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 10-28°. The W(7)-O(10) bond length is 2.01 Å. The W(7)-O(18) bond length is 2.03 Å. The W(7)-O(20) bond length is 2.06 Å. The W(7)-O(23) bond length is 2.30 Å. The W(7)-O(26) bond length is 1.78 Å. The W(7)-O(4) bond length is 2.04 Å. In the eighth W site, W(8) is bonded to one O(11), one O(17), one O(24), one O(27), one O(28), and one O(8) atom to form a mixture of distorted edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 6-12°. The W(8)-O(11) bond length is 1.94 Å. The W(8)-O(17) bond length is 2.00 Å. The W(8)-O(24) bond length is 2.00 Å. The W(8)-O(27) bond length is 2.20 Å. The W(8)-O(28) bond length is 1.79 Å. The W(8)-O(8) bond length is 1.89 Å. There are eight inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a distorted L-shaped geometry to one O(23) and one O(28) atom. The Hg(1)-O(23) bond length is 2.20 Å. The Hg(1)-O(28) bond length is 2.43 Å. In the second Hg site, Hg(2) is bonded in a single-bond geometry to one O(5) atom. The Hg(2)-O(5) bond length is 2.15 Å. In the third Hg site, Hg(3) is bonded in a 2-coordinate geometry to one O(7) and one O(9) atom. The Hg(3)-O(7) bond length is 2.61 Å. The Hg(3)-O(9) bond length is 2.20 Å. In the fourth Hg site, Hg(4) is bonded in a single-bond geometry to one O(2) atom. The Hg(4)-O(2) bond length is 2.20 Å. In the fifth Hg site, Hg(5) is bonded in a single-bond geometry to one O(27) atom. The Hg(5)-O(27) bond length is 2.16 Å. In the sixth Hg site, Hg(6) is bonded in a single-bond geometry to one O(20) atom. The Hg(6)-O(20) bond length is 2.15 Å. In the seventh Hg site, Hg(7) is bonded in a single-bond geometry to one O(24) atom. The Hg(7)-O(24) bond length is 2.17 Å. In the eighth Hg site, Hg(8) is bonded in a single-bond geometry to one O(6) atom. The Hg(8)-O(6) bond length is 2.16 Å. There are twenty-eight inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one W(1) atom. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one W(1), one W(3), and one Hg(4) atom. In the third O site, O(3) is bonded in a single-bond geometry to one W(2) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Mg(1), one W(3), and one W(7) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one W(1), one W(3), and one Hg(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one W(2), one W(4), and one Hg(8) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one W(3) and one Hg(3) atom. In the eighth O site, O(8) is bonded in a linear geometry to one W(4) and one W(8) atom. In the ninth O site, O(9) is bonded in a trigonal planar geometry to one W(2), one W(4), and one Hg(3) atom. In the tenth O site, O(10) is bonded in a linear geometry to one W(3) and one W(7) atom. In the eleventh O site, O(11) is bonded in a linear geometry to one W(2) and one W(8) atom. In the twelfth O site, O(12) is bonded in a T-shaped geometry to one Mg(1), one W(1), and one W(5) atom. In the thirteenth O site, O(13) is bonded in a T-shaped geometry to one Mg(1), one W(3), and one W(5) atom. In the fourteenth O site, O(14) is bonded in an L-shaped geometry to one Mg(1) and one W(5) atom. In the fifteenth O site, O(15) is bonded in a single-bond geometry to one W(4) atom. In the sixteenth O site, O(16) is bonded in a linear geometry to one W(4) and one W(6) atom. In the seventeenth O site, O(17) is bonded in a linear geometry to one W(4) and one W(8) atom. In the eighteenth O site, O(18) is bonded in a T-shaped geometry to one Mg(1), one W(1), and one W(7) atom. In the nineteenth O site, O(19) is bonded in a linear geometry to one W(2) and one W(6) atom. In the twentieth O site, O(20) is bonded in a trigonal planar geometry to one W(5), one W(7), and one Hg(6) atom. In the twenty-first O site, O(21) is bonded in a linear geometry to one W(1) and one W(5) atom. In the twenty-second O site, O(22) is bonded in a single-bond geometry to one W(6) atom. In the twenty-third O site, O(23) is bonded in a distorted trigonal planar geometry to one W(5), one W(7), and one Hg(1) atom. In the twenty-fourth O site, O(24) is bonded in a distorted trigonal planar geometry to one W(6), one W(8), and one Hg(7) atom. In the twenty-fifth O site, O(25) is bonded in a linear geometry to one W(2) and one W(6) atom. In the twenty-sixth O site, O(26) is bonded in a single-bond geometry to one W(7) atom. In the twenty-seventh O site, O(27) is bonded in a trigonal planar geometry to one W(6), one W(8), and one Hg(5) atom. In the twenty-eighth O site, O(28) is bonded in a distorted bent 150 degrees geometry to one W(8) and one Hg(1) atom.