K2Mo2O15 crystallizes in the triclinic P-1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to one O(10), one O(11), one O(15), one O(6), one O(7), and one O(9) atom to form distorted KO6 octahedra that share corners with two equivalent Mo(2)O5 trigonal bipyramids. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(5), one O(7), one O(8), and two equivalent O(14) atoms. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded in a 5-coordinate geometry to one O(1), one O(13), one O(15), one O(6), and one O(8) atom. In the second Mo site, Mo(2) is bonded to one O(1), one O(10), one O(11), one O(12), and one O(3) atom to form distorted MoO5 trigonal bipyramids that share corners with two equivalent K(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-53°. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Mo(1) and one Mo(2) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one K(2) and one O(5) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one K(2) and one Mo(2) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one O(7) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one K(2) and one O(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one K(1), one Mo(1), and one O(13) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one K(1), one K(2), and one O(4) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one K(2) and one Mo(1) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one K(1) and one O(10) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one K(1), one Mo(2), and one O(9) atom. In the eleventh O site, O(11) is bonded in a distorted bent 150 degrees geometry to one K(1) and one Mo(2) atom. In the twelfth O site, O(12) is bonded in a distorted water-like geometry to one Mo(2) and one O(14) atom. In the thirteenth O site, O(13) is bonded in a 2-coordinate geometry to one Mo(1) and one O(6) atom. In the fourteenth O site, O(14) is bonded in a distorted water-like geometry to two equivalent K(2) and one O(12) atom. In the fifteenth O site, O(15) is bonded in a bent 120 degrees geometry to one K(1) and one Mo(1) atom.
K2Mo2O15 crystallizes in the triclinic P-1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to one O(10), one O(11), one O(15), one O(6), one O(7), and one O(9) atom to form distorted KO6 octahedra that share corners with two equivalent Mo(2)O5 trigonal bipyramids. The K(1)-O(10) bond length is 2.87 Å. The K(1)-O(11) bond length is 2.79 Å. The K(1)-O(15) bond length is 2.83 Å. The K(1)-O(6) bond length is 2.69 Å. The K(1)-O(7) bond length is 2.96 Å. The K(1)-O(9) bond length is 2.93 Å. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(5), one O(7), one O(8), and two equivalent O(14) atoms. The K(2)-O(2) bond length is 3.21 Å. The K(2)-O(3) bond length is 2.63 Å. The K(2)-O(5) bond length is 3.30 Å. The K(2)-O(7) bond length is 3.03 Å. The K(2)-O(8) bond length is 2.79 Å. There is one shorter (2.83 Å) and one longer (3.33 Å) K(2)-O(14) bond length. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded in a 5-coordinate geometry to one O(1), one O(13), one O(15), one O(6), and one O(8) atom. The Mo(1)-O(1) bond length is 1.95 Å. The Mo(1)-O(13) bond length is 2.01 Å. The Mo(1)-O(15) bond length is 1.75 Å. The Mo(1)-O(6) bond length is 1.97 Å. The Mo(1)-O(8) bond length is 1.75 Å. In the second Mo site, Mo(2) is bonded to one O(1), one O(10), one O(11), one O(12), and one O(3) atom to form distorted MoO5 trigonal bipyramids that share corners with two equivalent K(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-53°. The Mo(2)-O(1) bond length is 1.93 Å. The Mo(2)-O(10) bond length is 2.12 Å. The Mo(2)-O(11) bond length is 1.75 Å. The Mo(2)-O(12) bond length is 2.11 Å. The Mo(2)-O(3) bond length is 1.75 Å. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Mo(1) and one Mo(2) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one K(2) and one O(5) atom. The O(2)-O(5) bond length is 1.23 Å. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one K(2) and one Mo(2) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one O(7) atom. The O(4)-O(7) bond length is 1.24 Å. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one K(2) and one O(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one K(1), one Mo(1), and one O(13) atom. The O(6)-O(13) bond length is 1.47 Å. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one K(1), one K(2), and one O(4) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one K(2) and one Mo(1) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one K(1) and one O(10) atom. The O(9)-O(10) bond length is 1.33 Å. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one K(1), one Mo(2), and one O(9) atom. In the eleventh O site, O(11) is bonded in a distorted bent 150 degrees geometry to one K(1) and one Mo(2) atom. In the twelfth O site, O(12) is bonded in a distorted water-like geometry to one Mo(2) and one O(14) atom. The O(12)-O(14) bond length is 1.33 Å. In the thirteenth O site, O(13) is bonded in a 2-coordinate geometry to one Mo(1) and one O(6) atom. In the fourteenth O site, O(14) is bonded in a distorted water-like geometry to two equivalent K(2) and one O(12) atom. In the fifteenth O site, O(15) is bonded in a bent 120 degrees geometry to one K(1) and one Mo(1) atom.