MgZn4(Se2O5)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 5-coordinate geometry to one O(1), one O(13), one O(17), one O(20), and one O(5) atom. There are four inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a square pyramidal geometry to one O(15), one O(18), one O(19), one O(6), and one O(7) atom. In the second Zn site, Zn(2) is bonded in a 4-coordinate geometry to one O(13), one O(16), one O(20), one O(5), and one O(8) atom. In the third Zn site, Zn(3) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(14), one O(15), one O(18), and one O(19) atom. In the fourth Zn site, Zn(4) is bonded in a 5-coordinate geometry to one O(12), one O(13), one O(16), one O(17), and one O(9) atom. There are eight inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted water-like geometry to one O(19) and one O(2) atom. In the second Se site, Se(2) is bonded in a distorted trigonal non-coplanar geometry to one O(20), one O(5), and one O(6) atom. In the third Se site, Se(3) is bonded in a trigonal non-coplanar geometry to one O(1), one O(17), and one O(7) atom. In the fourth Se site, Se(4) is bonded in a distorted trigonal non-coplanar geometry to one O(18), one O(2), and one O(8) atom. In the fifth Se site, Se(5) is bonded in a distorted trigonal non-coplanar geometry to one O(15), one O(4), and one O(9) atom. In the sixth Se site, Se(6) is bonded in a trigonal non-coplanar geometry to one O(10), one O(16), and one O(3) atom. In the seventh Se site, Se(7) is bonded in a distorted trigonal non-coplanar geometry to one O(11), one O(13), and one O(3) atom. In the eighth Se site, Se(8) is bonded in a distorted trigonal non-coplanar geometry to one O(12), one O(14), and one O(4) atom. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Mg(1) and one Se(3) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Se(1) and one Se(4) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Se(6) and one Se(7) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Se(5) and one Se(8) atom. In the fifth O site, O(5) is bonded in a T-shaped geometry to one Mg(1), one Zn(2), and one Se(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Zn(1) and one Se(2) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Zn(1) and one Se(3) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Zn(2) and one Se(4) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Zn(4) and one Se(5) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Zn(3) and one Se(6) atom. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one Zn(3) and one Se(7) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one Zn(4) and one Se(8) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one Mg(1), one Zn(2), one Zn(4), and one Se(7) atom. In the fourteenth O site, O(14) is bonded in a bent 120 degrees geometry to one Zn(3) and one Se(8) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Zn(1), one Zn(3), and one Se(5) atom. In the sixteenth O site, O(16) is bonded in a distorted trigonal non-coplanar geometry to one Zn(2), one Zn(4), and one Se(6) atom. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to one Mg(1), one Zn(4), and one Se(3) atom. In the eighteenth O site, O(18) is bonded in a distorted trigonal planar geometry to one Zn(1), one Zn(3), and one Se(4) atom. In the nineteenth O site, O(19) is bonded in a trigonal non-coplanar geometry to one Zn(1), one Zn(3), and one Se(1) atom. In the twentieth O site, O(20) is bonded in a distorted T-shaped geometry to one Mg(1), one Zn(2), and one Se(2) atom.
MgZn4(Se2O5)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 5-coordinate geometry to one O(1), one O(13), one O(17), one O(20), and one O(5) atom. The Mg(1)-O(1) bond length is 2.10 Å. The Mg(1)-O(13) bond length is 2.12 Å. The Mg(1)-O(17) bond length is 2.23 Å. The Mg(1)-O(20) bond length is 2.09 Å. The Mg(1)-O(5) bond length is 2.04 Å. There are four inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a square pyramidal geometry to one O(15), one O(18), one O(19), one O(6), and one O(7) atom. The Zn(1)-O(15) bond length is 2.12 Å. The Zn(1)-O(18) bond length is 2.08 Å. The Zn(1)-O(19) bond length is 2.09 Å. The Zn(1)-O(6) bond length is 2.08 Å. The Zn(1)-O(7) bond length is 2.09 Å. In the second Zn site, Zn(2) is bonded in a 4-coordinate geometry to one O(13), one O(16), one O(20), one O(5), and one O(8) atom. The Zn(2)-O(13) bond length is 2.55 Å. The Zn(2)-O(16) bond length is 2.00 Å. The Zn(2)-O(20) bond length is 2.15 Å. The Zn(2)-O(5) bond length is 2.11 Å. The Zn(2)-O(8) bond length is 2.00 Å. In the third Zn site, Zn(3) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(14), one O(15), one O(18), and one O(19) atom. The Zn(3)-O(10) bond length is 2.26 Å. The Zn(3)-O(11) bond length is 2.48 Å. The Zn(3)-O(14) bond length is 2.03 Å. The Zn(3)-O(15) bond length is 2.12 Å. The Zn(3)-O(18) bond length is 2.25 Å. The Zn(3)-O(19) bond length is 2.08 Å. In the fourth Zn site, Zn(4) is bonded in a 5-coordinate geometry to one O(12), one O(13), one O(16), one O(17), and one O(9) atom. The Zn(4)-O(12) bond length is 2.07 Å. The Zn(4)-O(13) bond length is 2.27 Å. The Zn(4)-O(16) bond length is 2.14 Å. The Zn(4)-O(17) bond length is 2.03 Å. The Zn(4)-O(9) bond length is 2.01 Å. There are eight inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted water-like geometry to one O(19) and one O(2) atom. The Se(1)-O(19) bond length is 1.81 Å. The Se(1)-O(2) bond length is 1.84 Å. In the second Se site, Se(2) is bonded in a distorted trigonal non-coplanar geometry to one O(20), one O(5), and one O(6) atom. The Se(2)-O(20) bond length is 1.78 Å. The Se(2)-O(5) bond length is 1.75 Å. The Se(2)-O(6) bond length is 1.72 Å. In the third Se site, Se(3) is bonded in a trigonal non-coplanar geometry to one O(1), one O(17), and one O(7) atom. The Se(3)-O(1) bond length is 1.73 Å. The Se(3)-O(17) bond length is 1.81 Å. The Se(3)-O(7) bond length is 1.73 Å. In the fourth Se site, Se(4) is bonded in a distorted trigonal non-coplanar geometry to one O(18), one O(2), and one O(8) atom. The Se(4)-O(18) bond length is 1.74 Å. The Se(4)-O(2) bond length is 1.88 Å. The Se(4)-O(8) bond length is 1.70 Å. In the fifth Se site, Se(5) is bonded in a distorted trigonal non-coplanar geometry to one O(15), one O(4), and one O(9) atom. The Se(5)-O(15) bond length is 1.72 Å. The Se(5)-O(4) bond length is 1.84 Å. The Se(5)-O(9) bond length is 1.72 Å. In the sixth Se site, Se(6) is bonded in a trigonal non-coplanar geometry to one O(10), one O(16), and one O(3) atom. The Se(6)-O(10) bond length is 1.69 Å. The Se(6)-O(16) bond length is 1.77 Å. The Se(6)-O(3) bond length is 1.82 Å. In the seventh Se site, Se(7) is bonded in a distorted trigonal non-coplanar geometry to one O(11), one O(13), and one O(3) atom. The Se(7)-O(11) bond length is 1.67 Å. The Se(7)-O(13) bond length is 1.74 Å. The Se(7)-O(3) bond length is 1.95 Å. In the eighth Se site, Se(8) is bonded in a distorted trigonal non-coplanar geometry to one O(12), one O(14), and one O(4) atom. The Se(8)-O(12) bond length is 1.72 Å. The Se(8)-O(14) bond length is 1.70 Å. The Se(8)-O(4) bond length is 1.87 Å. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Mg(1) and one Se(3) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Se(1) and one Se(4) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Se(6) and one Se(7) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Se(5) and one Se(8) atom. In the fifth O site, O(5) is bonded in a T-shaped geometry to one Mg(1), one Zn(2), and one Se(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Zn(1) and one Se(2) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Zn(1) and one Se(3) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Zn(2) and one Se(4) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Zn(4) and one Se(5) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Zn(3) and one Se(6) atom. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one Zn(3) and one Se(7) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one Zn(4) and one Se(8) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one Mg(1), one Zn(2), one Zn(4), and one Se(7) atom. In the fourteenth O site, O(14) is bonded in a bent 120 degrees geometry to one Zn(3) and one Se(8) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Zn(1), one Zn(3), and one Se(5) atom. In the sixteenth O site, O(16) is bonded in a distorted trigonal non-coplanar geometry to one Zn(2), one Zn(4), and one Se(6) atom. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to one Mg(1), one Zn(4), and one Se(3) atom. In the eighteenth O site, O(18) is bonded in a distorted trigonal planar geometry to one Zn(1), one Zn(3), and one Se(4) atom. In the nineteenth O site, O(19) is bonded in a trigonal non-coplanar geometry to one Zn(1), one Zn(3), and one Se(1) atom. In the twentieth O site, O(20) is bonded in a distorted T-shaped geometry to one Mg(1), one Zn(2), and one Se(2) atom.