Rb4MgMo2(SO)4 crystallizes in the triclinic P1 space group. There are four inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 5-coordinate geometry to one S(1), one S(2), one S(4), one O(1), and one O(2) atom. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to one S(2), one S(3), two equivalent S(1), one O(2), and one O(4) atom. In the third Rb site, Rb(3) is bonded in a 7-coordinate geometry to one S(2), one S(3), two equivalent S(4), one O(1), one O(3), and one O(4) atom. In the fourth Rb site, Rb(4) is bonded in a 7-coordinate geometry to one S(1), one S(4), two equivalent S(3), one O(2), one O(3), and one O(4) atom. Mg(1) is bonded to one S(2), one S(4), one O(1), and one O(3) atom to form distorted MgS2O2 tetrahedra that share corners with two equivalent Mo(1)S2O2 tetrahedra and corners with two equivalent Mo(2)S2O2 tetrahedra. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one S(1), one S(2), one O(1), and one O(2) atom to form distorted MoS2O2 tetrahedra that share corners with two equivalent Mg(1)S2O2 tetrahedra. In the second Mo site, Mo(2) is bonded to one S(3), one S(4), one O(3), and one O(4) atom to form distorted MoS2O2 tetrahedra that share corners with two equivalent Mg(1)S2O2 tetrahedra. There are four inequivalent S sites. In the first S site, S(1) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(4), two equivalent Rb(2), and one Mo(1) atom. In the second S site, S(2) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(2), one Rb(3), one Mg(1), and one Mo(1) atom. In the third S site, S(3) is bonded to one Rb(2), one Rb(3), two equivalent Rb(4), and one Mo(2) atom to form corner-sharing SRb4Mo square pyramids. In the fourth S site, S(4) is bonded in a 2-coordinate geometry to one Rb(1), one Rb(4), two equivalent Rb(3), one Mg(1), and one Mo(2) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(3), one Mg(1), and one Mo(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(2), one Rb(4), and one Mo(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Rb(3), one Rb(4), one Mg(1), and one Mo(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Rb(2), one Rb(3), one Rb(4), and one Mo(2) atom.
Rb4MgMo2(SO)4 crystallizes in the triclinic P1 space group. There are four inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 5-coordinate geometry to one S(1), one S(2), one S(4), one O(1), and one O(2) atom. The Rb(1)-S(1) bond length is 3.27 Å. The Rb(1)-S(2) bond length is 3.42 Å. The Rb(1)-S(4) bond length is 3.56 Å. The Rb(1)-O(1) bond length is 2.87 Å. The Rb(1)-O(2) bond length is 2.89 Å. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to one S(2), one S(3), two equivalent S(1), one O(2), and one O(4) atom. The Rb(2)-S(2) bond length is 3.44 Å. The Rb(2)-S(3) bond length is 3.31 Å. There is one shorter (3.27 Å) and one longer (3.87 Å) Rb(2)-S(1) bond length. The Rb(2)-O(2) bond length is 2.97 Å. The Rb(2)-O(4) bond length is 3.03 Å. In the third Rb site, Rb(3) is bonded in a 7-coordinate geometry to one S(2), one S(3), two equivalent S(4), one O(1), one O(3), and one O(4) atom. The Rb(3)-S(2) bond length is 3.44 Å. The Rb(3)-S(3) bond length is 3.25 Å. There is one shorter (3.71 Å) and one longer (3.75 Å) Rb(3)-S(4) bond length. The Rb(3)-O(1) bond length is 3.03 Å. The Rb(3)-O(3) bond length is 3.08 Å. The Rb(3)-O(4) bond length is 3.16 Å. In the fourth Rb site, Rb(4) is bonded in a 7-coordinate geometry to one S(1), one S(4), two equivalent S(3), one O(2), one O(3), and one O(4) atom. The Rb(4)-S(1) bond length is 3.44 Å. The Rb(4)-S(4) bond length is 3.69 Å. There is one shorter (3.38 Å) and one longer (3.48 Å) Rb(4)-S(3) bond length. The Rb(4)-O(2) bond length is 3.07 Å. The Rb(4)-O(3) bond length is 3.40 Å. The Rb(4)-O(4) bond length is 2.99 Å. Mg(1) is bonded to one S(2), one S(4), one O(1), and one O(3) atom to form distorted MgS2O2 tetrahedra that share corners with two equivalent Mo(1)S2O2 tetrahedra and corners with two equivalent Mo(2)S2O2 tetrahedra. The Mg(1)-S(2) bond length is 2.48 Å. The Mg(1)-S(4) bond length is 2.48 Å. The Mg(1)-O(1) bond length is 1.99 Å. The Mg(1)-O(3) bond length is 1.97 Å. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one S(1), one S(2), one O(1), and one O(2) atom to form distorted MoS2O2 tetrahedra that share corners with two equivalent Mg(1)S2O2 tetrahedra. The Mo(1)-S(1) bond length is 2.28 Å. The Mo(1)-S(2) bond length is 2.35 Å. The Mo(1)-O(1) bond length is 1.86 Å. The Mo(1)-O(2) bond length is 1.79 Å. In the second Mo site, Mo(2) is bonded to one S(3), one S(4), one O(3), and one O(4) atom to form distorted MoS2O2 tetrahedra that share corners with two equivalent Mg(1)S2O2 tetrahedra. The Mo(2)-S(3) bond length is 2.29 Å. The Mo(2)-S(4) bond length is 2.35 Å. The Mo(2)-O(3) bond length is 1.88 Å. The Mo(2)-O(4) bond length is 1.80 Å. There are four inequivalent S sites. In the first S site, S(1) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(4), two equivalent Rb(2), and one Mo(1) atom. In the second S site, S(2) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(2), one Rb(3), one Mg(1), and one Mo(1) atom. In the third S site, S(3) is bonded to one Rb(2), one Rb(3), two equivalent Rb(4), and one Mo(2) atom to form corner-sharing SRb4Mo square pyramids. In the fourth S site, S(4) is bonded in a 2-coordinate geometry to one Rb(1), one Rb(4), two equivalent Rb(3), one Mg(1), and one Mo(2) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(3), one Mg(1), and one Mo(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(2), one Rb(4), and one Mo(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Rb(3), one Rb(4), one Mg(1), and one Mo(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Rb(2), one Rb(3), one Rb(4), and one Mo(2) atom.