K8MgCo2(Mo4O15)2 crystallizes in the triclinic P1 space group. There are eight inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one O(15), one O(16), one O(17), one O(18), one O(5), one O(6), and one O(8) atom. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(15), one O(19), one O(27), one O(29), one O(3), one O(4), and one O(8) atom. In the third K site, K(3) is bonded in a 7-coordinate geometry to one O(15), one O(19), one O(23), one O(26), one O(30), one O(7), and one O(9) atom. In the fourth K site, K(4) is bonded to one O(17), one O(20), one O(21), one O(27), one O(28), and one O(30) atom to form KO6 octahedra that share  a cornercorner with one Mo(1)O4 tetrahedra,  a cornercorner with one Mo(2)O4 tetrahedra,  a cornercorner with one Mo(3)O4 tetrahedra,  a cornercorner with one Mo(5)O4 tetrahedra,  a cornercorner with one Mo(7)O4 tetrahedra, and  a cornercorner with one Mo(8)O4 tetrahedra. In the fifth K site, K(5) is bonded in a 9-coordinate geometry to one Mg(1), one O(10), one O(13), one O(16), one O(19), one O(20), one O(21), one O(26), and one O(5) atom. In the sixth K site, K(6) is bonded in a 8-coordinate geometry to one O(10), one O(14), one O(16), one O(23), one O(27), one O(28), one O(29), and one O(9) atom. In the seventh K site, K(7) is bonded in a 7-coordinate geometry to one O(21), one O(25), one O(29), one O(4), one O(5), one O(6), and one O(9) atom. In the eighth K site, K(8) is bonded in a 9-coordinate geometry to one O(13), one O(14), one O(18), one O(20), one O(25), one O(28), one O(3), one O(30), and one O(7) atom. Mg(1) is bonded in a distorted rectangular see-saw-like geometry to one K(5), one O(11), one O(13), one O(24), and one O(5) atom. There are eight inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(12), one O(13), one O(21), and one O(6) atom to form MoO4 tetrahedra that share  a cornercorner with one K(4)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra, and  a cornercorner with one Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 22-49°. In the second Mo site, Mo(2) is bonded to one O(10), one O(18), one O(24), and one O(28) atom to form MoO4 tetrahedra that share  a cornercorner with one K(4)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra, and  a cornercorner with one Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-48°. In the third Mo site, Mo(3) is bonded to one O(17), one O(22), one O(7), and one O(8) atom to form MoO4 tetrahedra that share  a cornercorner with one K(4)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra, and  a cornercorner with one Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-45°. In the fourth Mo site, Mo(4) is bonded in a 6-coordinate geometry to one O(12), one O(16), one O(19), one O(2), one O(22), and one O(9) atom. In the fifth Mo site, Mo(5) is bonded to one O(1), one O(20), one O(26), and one O(3) atom to form MoO4 tetrahedra that share  a cornercorner with one K(4)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra, and  a cornercorner with one Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 5-49°. In the sixth Mo site, Mo(6) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(15), one O(24), one O(29), and one O(5) atom. In the seventh Mo site, Mo(7) is bonded to one O(14), one O(2), one O(27), and one O(4) atom to form MoO4 tetrahedra that share  a cornercorner with one K(4)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra, and  a cornercorner with one Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-48°. In the eighth Mo site, Mo(8) is bonded to one O(11), one O(23), one O(25), and one O(30) atom to form MoO4 tetrahedra that share  a cornercorner with one K(4)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra, and  a cornercorner with one Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-49°. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(11), one O(24), one O(4), one O(6), and one O(8) atom to form distorted CoO6 octahedra that share  a cornercorner with one Mo(1)O4 tetrahedra,  a cornercorner with one Mo(2)O4 tetrahedra,  a cornercorner with one Mo(3)O4 tetrahedra,  a cornercorner with one Mo(5)O4 tetrahedra,  a cornercorner with one Mo(7)O4 tetrahedra, and  a cornercorner with one Mo(8)O4 tetrahedra. In the second Co site, Co(2) is bonded to one O(10), one O(12), one O(2), one O(22), one O(23), and one O(26) atom to form CoO6 octahedra that share  a cornercorner with one Mo(1)O4 tetrahedra,  a cornercorner with one Mo(2)O4 tetrahedra,  a cornercorner with one Mo(3)O4 tetrahedra,  a cornercorner with one Mo(5)O4 tetrahedra,  a cornercorner with one Mo(7)O4 tetrahedra, and  a cornercorner with one Mo(8)O4 tetrahedra. There are thirty inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Mo(5), one Mo(6), and one Co(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mo(4), one Mo(7), and one Co(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(2), one K(8), and one Mo(5) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one K(2), one K(7), one Mo(7), and one Co(1) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one K(1), one K(5), one K(7), one Mg(1), and one Mo(6) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one K(1), one K(7), one Mo(1), and one Co(1) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one K(3), one K(8), and one Mo(3) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one K(1), one K(2), one Mo(3), and one Co(1) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one K(3), one K(6), one K(7), and one Mo(4) atom. In the tenth O site, O(10) is bonded in a 2-coordinate geometry to one K(5), one K(6), one Mo(2), and one Co(2) atom. In the eleventh O site, O(11) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mo(6), one Mo(8), and one Co(1) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Mo(1), one Mo(4), and one Co(2) atom. In the thirteenth O site, O(13) is bonded in a distorted water-like geometry to one K(5), one K(8), one Mg(1), and one Mo(1) atom. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one K(6), one K(8), and one Mo(7) atom. In the fifteenth O site, O(15) is bonded in a 4-coordinate geometry to one K(1), one K(2), one K(3), and one Mo(6) atom. In the sixteenth O site, O(16) is bonded to one K(1), one K(5), one K(6), and one Mo(4) atom to form distorted edge-sharing OK3Mo tetrahedra. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to one K(1), one K(4), and one Mo(3) atom. In the eighteenth O site, O(18) is bonded in a distorted single-bond geometry to one K(1), one K(8), and one Mo(2) atom. In the nineteenth O site, O(19) is bonded to one K(2), one K(3), one K(5), and one Mo(4) atom to form distorted edge-sharing OK3Mo tetrahedra. In the twentieth O site, O(20) is bonded in a 1-coordinate geometry to one K(4), one K(5), one K(8), and one Mo(5) atom. In the twenty-first O site, O(21) is bonded in a distorted rectangular see-saw-like geometry to one K(4), one K(5), one K(7), and one Mo(1) atom. In the twenty-second O site, O(22) is bonded in a 3-coordinate geometry to one Mo(3), one Mo(4), and one Co(2) atom. In the twenty-third O site, O(23) is bonded in a 4-coordinate geometry to one K(3), one K(6), one Mo(8), and one Co(2) atom. In the twenty-fourth O site, O(24) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mo(2), one Mo(6), and one Co(1) atom. In the twenty-fifth O site, O(25) is bonded in a distorted single-bond geometry to one K(7), one K(8), and one Mo(8) atom. In the twenty-sixth O site, O(26) is bonded in a 4-coordinate geometry to one K(3), one K(5), one Mo(5), and one Co(2) atom. In the twenty-seventh O site, O(27) is bonded in a 1-coordinate geometry to one K(2), one K(4), one K(6), and one Mo(7) atom. In the twenty-eighth O site, O(28) is bonded in a distorted single-bond geometry to one K(4), one K(6), one K(8), and one Mo(2) atom. In the twenty-ninth O site, O(29) is bonded in a 4-coordinate geometry to one K(2), one K(6), one K(7), and one Mo(6) atom. In the thirtieth O site, O(30) is bonded in a distorted single-bond geometry to one K(3), one K(4), one K(8), and one Mo(8) atom.
K8MgCo2(Mo4O15)2 crystallizes in the triclinic P1 space group. There are eight inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one O(15), one O(16), one O(17), one O(18), one O(5), one O(6), and one O(8) atom. The K(1)-O(15) bond length is 2.78 Å. The K(1)-O(16) bond length is 2.74 Å. The K(1)-O(17) bond length is 2.98 Å. The K(1)-O(18) bond length is 2.96 Å. The K(1)-O(5) bond length is 3.03 Å. The K(1)-O(6) bond length is 2.83 Å. The K(1)-O(8) bond length is 2.95 Å. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(15), one O(19), one O(27), one O(29), one O(3), one O(4), and one O(8) atom. The K(2)-O(15) bond length is 2.93 Å. The K(2)-O(19) bond length is 2.68 Å. The K(2)-O(27) bond length is 2.88 Å. The K(2)-O(29) bond length is 2.88 Å. The K(2)-O(3) bond length is 2.81 Å. The K(2)-O(4) bond length is 2.91 Å. The K(2)-O(8) bond length is 2.79 Å. In the third K site, K(3) is bonded in a 7-coordinate geometry to one O(15), one O(19), one O(23), one O(26), one O(30), one O(7), and one O(9) atom. The K(3)-O(15) bond length is 2.62 Å. The K(3)-O(19) bond length is 2.78 Å. The K(3)-O(23) bond length is 3.06 Å. The K(3)-O(26) bond length is 2.91 Å. The K(3)-O(30) bond length is 2.85 Å. The K(3)-O(7) bond length is 2.81 Å. The K(3)-O(9) bond length is 2.93 Å. In the fourth K site, K(4) is bonded to one O(17), one O(20), one O(21), one O(27), one O(28), and one O(30) atom to form KO6 octahedra that share  a cornercorner with one Mo(1)O4 tetrahedra,  a cornercorner with one Mo(2)O4 tetrahedra,  a cornercorner with one Mo(3)O4 tetrahedra,  a cornercorner with one Mo(5)O4 tetrahedra,  a cornercorner with one Mo(7)O4 tetrahedra, and  a cornercorner with one Mo(8)O4 tetrahedra. The K(4)-O(17) bond length is 2.77 Å. The K(4)-O(20) bond length is 2.86 Å. The K(4)-O(21) bond length is 2.83 Å. The K(4)-O(27) bond length is 2.85 Å. The K(4)-O(28) bond length is 3.00 Å. The K(4)-O(30) bond length is 3.20 Å. In the fifth K site, K(5) is bonded in a 9-coordinate geometry to one Mg(1), one O(10), one O(13), one O(16), one O(19), one O(20), one O(21), one O(26), and one O(5) atom. The K(5)-Mg(1) bond length is 3.05 Å. The K(5)-O(10) bond length is 3.08 Å. The K(5)-O(13) bond length is 3.22 Å. The K(5)-O(16) bond length is 2.75 Å. The K(5)-O(19) bond length is 2.60 Å. The K(5)-O(20) bond length is 2.82 Å. The K(5)-O(21) bond length is 2.84 Å. The K(5)-O(26) bond length is 2.89 Å. The K(5)-O(5) bond length is 2.79 Å. In the sixth K site, K(6) is bonded in a 8-coordinate geometry to one O(10), one O(14), one O(16), one O(23), one O(27), one O(28), one O(29), and one O(9) atom. The K(6)-O(10) bond length is 3.21 Å. The K(6)-O(14) bond length is 2.84 Å. The K(6)-O(16) bond length is 2.78 Å. The K(6)-O(23) bond length is 2.83 Å. The K(6)-O(27) bond length is 3.41 Å. The K(6)-O(28) bond length is 2.97 Å. The K(6)-O(29) bond length is 2.65 Å. The K(6)-O(9) bond length is 3.03 Å. In the seventh K site, K(7) is bonded in a 7-coordinate geometry to one O(21), one O(25), one O(29), one O(4), one O(5), one O(6), and one O(9) atom. The K(7)-O(21) bond length is 2.92 Å. The K(7)-O(25) bond length is 2.88 Å. The K(7)-O(29) bond length is 2.86 Å. The K(7)-O(4) bond length is 2.85 Å. The K(7)-O(5) bond length is 2.82 Å. The K(7)-O(6) bond length is 2.99 Å. The K(7)-O(9) bond length is 2.72 Å. In the eighth K site, K(8) is bonded in a 9-coordinate geometry to one O(13), one O(14), one O(18), one O(20), one O(25), one O(28), one O(3), one O(30), and one O(7) atom. The K(8)-O(13) bond length is 2.89 Å. The K(8)-O(14) bond length is 2.81 Å. The K(8)-O(18) bond length is 2.88 Å. The K(8)-O(20) bond length is 3.21 Å. The K(8)-O(25) bond length is 2.91 Å. The K(8)-O(28) bond length is 3.08 Å. The K(8)-O(3) bond length is 2.85 Å. The K(8)-O(30) bond length is 3.07 Å. The K(8)-O(7) bond length is 2.83 Å. Mg(1) is bonded in a distorted rectangular see-saw-like geometry to one K(5), one O(11), one O(13), one O(24), and one O(5) atom. The Mg(1)-O(11) bond length is 2.05 Å. The Mg(1)-O(13) bond length is 1.91 Å. The Mg(1)-O(24) bond length is 2.05 Å. The Mg(1)-O(5) bond length is 1.99 Å. There are eight inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(12), one O(13), one O(21), and one O(6) atom to form MoO4 tetrahedra that share  a cornercorner with one K(4)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra, and  a cornercorner with one Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 22-49°. The Mo(1)-O(12) bond length is 1.92 Å. The Mo(1)-O(13) bond length is 1.88 Å. The Mo(1)-O(21) bond length is 1.80 Å. The Mo(1)-O(6) bond length is 1.91 Å. In the second Mo site, Mo(2) is bonded to one O(10), one O(18), one O(24), and one O(28) atom to form MoO4 tetrahedra that share  a cornercorner with one K(4)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra, and  a cornercorner with one Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-48°. The Mo(2)-O(10) bond length is 1.81 Å. The Mo(2)-O(18) bond length is 1.75 Å. The Mo(2)-O(24) bond length is 1.90 Å. The Mo(2)-O(28) bond length is 1.78 Å. In the third Mo site, Mo(3) is bonded to one O(17), one O(22), one O(7), and one O(8) atom to form MoO4 tetrahedra that share  a cornercorner with one K(4)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra, and  a cornercorner with one Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-45°. The Mo(3)-O(17) bond length is 1.78 Å. The Mo(3)-O(22) bond length is 1.85 Å. The Mo(3)-O(7) bond length is 1.77 Å. The Mo(3)-O(8) bond length is 1.82 Å. In the fourth Mo site, Mo(4) is bonded in a 6-coordinate geometry to one O(12), one O(16), one O(19), one O(2), one O(22), and one O(9) atom. The Mo(4)-O(12) bond length is 2.20 Å. The Mo(4)-O(16) bond length is 1.79 Å. The Mo(4)-O(19) bond length is 1.79 Å. The Mo(4)-O(2) bond length is 2.23 Å. The Mo(4)-O(22) bond length is 2.26 Å. The Mo(4)-O(9) bond length is 1.78 Å. In the fifth Mo site, Mo(5) is bonded to one O(1), one O(20), one O(26), and one O(3) atom to form MoO4 tetrahedra that share  a cornercorner with one K(4)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra, and  a cornercorner with one Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 5-49°. The Mo(5)-O(1) bond length is 1.84 Å. The Mo(5)-O(20) bond length is 1.79 Å. The Mo(5)-O(26) bond length is 1.82 Å. The Mo(5)-O(3) bond length is 1.78 Å. In the sixth Mo site, Mo(6) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(15), one O(24), one O(29), and one O(5) atom. The Mo(6)-O(1) bond length is 2.27 Å. The Mo(6)-O(11) bond length is 2.43 Å. The Mo(6)-O(15) bond length is 1.79 Å. The Mo(6)-O(24) bond length is 2.33 Å. The Mo(6)-O(29) bond length is 1.79 Å. The Mo(6)-O(5) bond length is 1.96 Å. In the seventh Mo site, Mo(7) is bonded to one O(14), one O(2), one O(27), and one O(4) atom to form MoO4 tetrahedra that share  a cornercorner with one K(4)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra, and  a cornercorner with one Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-48°. The Mo(7)-O(14) bond length is 1.76 Å. The Mo(7)-O(2) bond length is 1.86 Å. The Mo(7)-O(27) bond length is 1.78 Å. The Mo(7)-O(4) bond length is 1.82 Å. In the eighth Mo site, Mo(8) is bonded to one O(11), one O(23), one O(25), and one O(30) atom to form MoO4 tetrahedra that share  a cornercorner with one K(4)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra, and  a cornercorner with one Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-49°. The Mo(8)-O(11) bond length is 1.89 Å. The Mo(8)-O(23) bond length is 1.82 Å. The Mo(8)-O(25) bond length is 1.75 Å. The Mo(8)-O(30) bond length is 1.77 Å. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(11), one O(24), one O(4), one O(6), and one O(8) atom to form distorted CoO6 octahedra that share  a cornercorner with one Mo(1)O4 tetrahedra,  a cornercorner with one Mo(2)O4 tetrahedra,  a cornercorner with one Mo(3)O4 tetrahedra,  a cornercorner with one Mo(5)O4 tetrahedra,  a cornercorner with one Mo(7)O4 tetrahedra, and  a cornercorner with one Mo(8)O4 tetrahedra. The Co(1)-O(1) bond length is 2.37 Å. The Co(1)-O(11) bond length is 2.18 Å. The Co(1)-O(24) bond length is 2.17 Å. The Co(1)-O(4) bond length is 2.09 Å. The Co(1)-O(6) bond length is 2.05 Å. The Co(1)-O(8) bond length is 2.07 Å. In the second Co site, Co(2) is bonded to one O(10), one O(12), one O(2), one O(22), one O(23), and one O(26) atom to form CoO6 octahedra that share  a cornercorner with one Mo(1)O4 tetrahedra,  a cornercorner with one Mo(2)O4 tetrahedra,  a cornercorner with one Mo(3)O4 tetrahedra,  a cornercorner with one Mo(5)O4 tetrahedra,  a cornercorner with one Mo(7)O4 tetrahedra, and  a cornercorner with one Mo(8)O4 tetrahedra. The Co(2)-O(10) bond length is 2.22 Å. The Co(2)-O(12) bond length is 2.04 Å. The Co(2)-O(2) bond length is 2.17 Å. The Co(2)-O(22) bond length is 2.17 Å. The Co(2)-O(23) bond length is 2.11 Å. The Co(2)-O(26) bond length is 2.09 Å. There are thirty inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Mo(5), one Mo(6), and one Co(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mo(4), one Mo(7), and one Co(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(2), one K(8), and one Mo(5) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one K(2), one K(7), one Mo(7), and one Co(1) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one K(1), one K(5), one K(7), one Mg(1), and one Mo(6) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one K(1), one K(7), one Mo(1), and one Co(1) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one K(3), one K(8), and one Mo(3) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one K(1), one K(2), one Mo(3), and one Co(1) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one K(3), one K(6), one K(7), and one Mo(4) atom. In the tenth O site, O(10) is bonded in a 2-coordinate geometry to one K(5), one K(6), one Mo(2), and one Co(2) atom. In the eleventh O site, O(11) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mo(6), one Mo(8), and one Co(1) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Mo(1), one Mo(4), and one Co(2) atom. In the thirteenth O site, O(13) is bonded in a distorted water-like geometry to one K(5), one K(8), one Mg(1), and one Mo(1) atom. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one K(6), one K(8), and one Mo(7) atom. In the fifteenth O site, O(15) is bonded in a 4-coordinate geometry to one K(1), one K(2), one K(3), and one Mo(6) atom. In the sixteenth O site, O(16) is bonded to one K(1), one K(5), one K(6), and one Mo(4) atom to form distorted edge-sharing OK3Mo tetrahedra. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to one K(1), one K(4), and one Mo(3) atom. In the eighteenth O site, O(18) is bonded in a distorted single-bond geometry to one K(1), one K(8), and one Mo(2) atom. In the nineteenth O site, O(19) is bonded to one K(2), one K(3), one K(5), and one Mo(4) atom to form distorted edge-sharing OK3Mo tetrahedra. In the twentieth O site, O(20) is bonded in a 1-coordinate geometry to one K(4), one K(5), one K(8), and one Mo(5) atom. In the twenty-first O site, O(21) is bonded in a distorted rectangular see-saw-like geometry to one K(4), one K(5), one K(7), and one Mo(1) atom. In the twenty-second O site, O(22) is bonded in a 3-coordinate geometry to one Mo(3), one Mo(4), and one Co(2) atom. In the twenty-third O site, O(23) is bonded in a 4-coordinate geometry to one K(3), one K(6), one Mo(8), and one Co(2) atom. In the twenty-fourth O site, O(24) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mo(2), one Mo(6), and one Co(1) atom. In the twenty-fifth O site, O(25) is bonded in a distorted single-bond geometry to one K(7), one K(8), and one Mo(8) atom. In the twenty-sixth O site, O(26) is bonded in a 4-coordinate geometry to one K(3), one K(5), one Mo(5), and one Co(2) atom. In the twenty-seventh O site, O(27) is bonded in a 1-coordinate geometry to one K(2), one K(4), one K(6), and one Mo(7) atom. In the twenty-eighth O site, O(28) is bonded in a distorted single-bond geometry to one K(4), one K(6), one K(8), and one Mo(2) atom. In the twenty-ninth O site, O(29) is bonded in a 4-coordinate geometry to one K(2), one K(6), one K(7), and one Mo(6) atom. In the thirtieth O site, O(30) is bonded in a distorted single-bond geometry to one K(3), one K(4), one K(8), and one Mo(8) atom.