K2MgNd2(SO4)4 crystallizes in the triclinic P1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one Mg(1), one O(1), one O(10), one O(11), one O(12), one O(13), one O(6), and one O(7) atom. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(10), one O(13), one O(14), one O(3), one O(6), one O(7), and one O(8) atom. Mg(1) is bonded in a 3-coordinate geometry to one K(1), one O(15), one O(16), and one O(5) atom. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(12), one O(16), one O(2), one O(4), one O(5), and one O(7) atom. In the second Nd site, Nd(2) is bonded in a 8-coordinate geometry to one O(1), one O(13), one O(14), one O(15), one O(3), one O(6), one O(8), and one O(9) atom. There are four inequivalent S sites. In the first S site, S(1) is bonded in a tetrahedral geometry to one O(12), one O(13), one O(6), and one O(8) atom. In the second S site, S(2) is bonded in a tetrahedral geometry to one O(14), one O(16), one O(3), and one O(4) atom. In the third S site, S(3) is bonded in a tetrahedral geometry to one O(1), one O(10), one O(11), and one O(7) atom. In the fourth S site, S(4) is bonded in a tetrahedral geometry to one O(15), one O(2), one O(5), and one O(9) atom. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one K(1), one Nd(2), and one S(3) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Nd(1) and one S(4) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one K(2), one Nd(2), and one S(2) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Nd(1) and one S(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Mg(1), one Nd(1), and one S(4) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one K(1), one K(2), one Nd(2), and one S(1) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one K(1), one K(2), one Nd(1), and one S(3) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one K(2), one Nd(2), and one S(1) atom. In the ninth O site, O(9) is bonded in a distorted linear geometry to one Nd(2) and one S(4) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one K(1), one K(2), one Nd(1), and one S(3) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal non-coplanar geometry to one K(1), one Nd(1), and one S(3) atom. In the twelfth O site, O(12) is bonded in a single-bond geometry to one K(1), one Nd(1), and one S(1) atom. In the thirteenth O site, O(13) is bonded in a distorted single-bond geometry to one K(1), one K(2), one Nd(2), and one S(1) atom. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one K(2), one Nd(2), and one S(2) atom. In the fifteenth O site, O(15) is bonded in a distorted T-shaped geometry to one Mg(1), one Nd(2), and one S(4) atom. In the sixteenth O site, O(16) is bonded in a distorted water-like geometry to one Mg(1), one Nd(1), and one S(2) atom.
K2MgNd2(SO4)4 crystallizes in the triclinic P1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one Mg(1), one O(1), one O(10), one O(11), one O(12), one O(13), one O(6), and one O(7) atom. The K(1)-Mg(1) bond length is 3.27 Å. The K(1)-O(1) bond length is 3.16 Å. The K(1)-O(10) bond length is 3.17 Å. The K(1)-O(11) bond length is 2.72 Å. The K(1)-O(12) bond length is 2.96 Å. The K(1)-O(13) bond length is 2.72 Å. The K(1)-O(6) bond length is 2.81 Å. The K(1)-O(7) bond length is 2.98 Å. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(10), one O(13), one O(14), one O(3), one O(6), one O(7), and one O(8) atom. The K(2)-O(10) bond length is 3.09 Å. The K(2)-O(13) bond length is 2.76 Å. The K(2)-O(14) bond length is 3.16 Å. The K(2)-O(3) bond length is 2.98 Å. The K(2)-O(6) bond length is 2.97 Å. The K(2)-O(7) bond length is 2.90 Å. The K(2)-O(8) bond length is 2.66 Å. Mg(1) is bonded in a 3-coordinate geometry to one K(1), one O(15), one O(16), and one O(5) atom. The Mg(1)-O(15) bond length is 2.25 Å. The Mg(1)-O(16) bond length is 2.14 Å. The Mg(1)-O(5) bond length is 2.17 Å. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(12), one O(16), one O(2), one O(4), one O(5), and one O(7) atom. The Nd(1)-O(10) bond length is 2.64 Å. The Nd(1)-O(11) bond length is 2.50 Å. The Nd(1)-O(12) bond length is 2.93 Å. The Nd(1)-O(16) bond length is 3.06 Å. The Nd(1)-O(2) bond length is 2.60 Å. The Nd(1)-O(4) bond length is 2.50 Å. The Nd(1)-O(5) bond length is 2.57 Å. The Nd(1)-O(7) bond length is 2.63 Å. In the second Nd site, Nd(2) is bonded in a 8-coordinate geometry to one O(1), one O(13), one O(14), one O(15), one O(3), one O(6), one O(8), and one O(9) atom. The Nd(2)-O(1) bond length is 2.46 Å. The Nd(2)-O(13) bond length is 2.48 Å. The Nd(2)-O(14) bond length is 2.52 Å. The Nd(2)-O(15) bond length is 2.49 Å. The Nd(2)-O(3) bond length is 2.41 Å. The Nd(2)-O(6) bond length is 2.49 Å. The Nd(2)-O(8) bond length is 2.57 Å. The Nd(2)-O(9) bond length is 2.44 Å. There are four inequivalent S sites. In the first S site, S(1) is bonded in a tetrahedral geometry to one O(12), one O(13), one O(6), and one O(8) atom. The S(1)-O(12) bond length is 1.46 Å. The S(1)-O(13) bond length is 1.51 Å. The S(1)-O(6) bond length is 1.50 Å. The S(1)-O(8) bond length is 1.50 Å. In the second S site, S(2) is bonded in a tetrahedral geometry to one O(14), one O(16), one O(3), and one O(4) atom. The S(2)-O(14) bond length is 1.49 Å. The S(2)-O(16) bond length is 1.50 Å. The S(2)-O(3) bond length is 1.49 Å. The S(2)-O(4) bond length is 1.48 Å. In the third S site, S(3) is bonded in a tetrahedral geometry to one O(1), one O(10), one O(11), and one O(7) atom. The S(3)-O(1) bond length is 1.48 Å. The S(3)-O(10) bond length is 1.50 Å. The S(3)-O(11) bond length is 1.50 Å. The S(3)-O(7) bond length is 1.50 Å. In the fourth S site, S(4) is bonded in a tetrahedral geometry to one O(15), one O(2), one O(5), and one O(9) atom. The S(4)-O(15) bond length is 1.52 Å. The S(4)-O(2) bond length is 1.46 Å. The S(4)-O(5) bond length is 1.52 Å. The S(4)-O(9) bond length is 1.48 Å. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one K(1), one Nd(2), and one S(3) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Nd(1) and one S(4) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one K(2), one Nd(2), and one S(2) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Nd(1) and one S(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Mg(1), one Nd(1), and one S(4) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one K(1), one K(2), one Nd(2), and one S(1) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one K(1), one K(2), one Nd(1), and one S(3) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one K(2), one Nd(2), and one S(1) atom. In the ninth O site, O(9) is bonded in a distorted linear geometry to one Nd(2) and one S(4) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one K(1), one K(2), one Nd(1), and one S(3) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal non-coplanar geometry to one K(1), one Nd(1), and one S(3) atom. In the twelfth O site, O(12) is bonded in a single-bond geometry to one K(1), one Nd(1), and one S(1) atom. In the thirteenth O site, O(13) is bonded in a distorted single-bond geometry to one K(1), one K(2), one Nd(2), and one S(1) atom. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one K(2), one Nd(2), and one S(2) atom. In the fifteenth O site, O(15) is bonded in a distorted T-shaped geometry to one Mg(1), one Nd(2), and one S(4) atom. In the sixteenth O site, O(16) is bonded in a distorted water-like geometry to one Mg(1), one Nd(1), and one S(2) atom.