K2Mo2O7 crystallizes in the triclinic P-1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and two equivalent O(6) atoms. In the second K site, K(2) is bonded in a 9-coordinate geometry to one O(1), one O(5), one O(6), two equivalent O(2), two equivalent O(4), and two equivalent O(7) atoms. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded in a tetrahedral geometry to one O(1), one O(3), one O(4), and one O(5) atom. In the second Mo site, Mo(2) is bonded in a 6-coordinate geometry to one O(3), one O(5), one O(6), one O(7), and two equivalent O(2) atoms. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one Mo(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one K(1), two equivalent K(2), and two equivalent Mo(2) atoms. In the third O site, O(3) is bonded in a 3-coordinate geometry to one K(1), one Mo(1), and one Mo(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one K(1), two equivalent K(2), and one Mo(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one K(1), one K(2), one Mo(1), and one Mo(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one K(2), two equivalent K(1), and one Mo(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to two equivalent K(2) and one Mo(2) atom.
K2Mo2O7 crystallizes in the triclinic P-1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and two equivalent O(6) atoms. The K(1)-O(1) bond length is 2.73 Å. The K(1)-O(2) bond length is 2.73 Å. The K(1)-O(3) bond length is 2.62 Å. The K(1)-O(4) bond length is 2.65 Å. The K(1)-O(5) bond length is 2.96 Å. There is one shorter (2.70 Å) and one longer (2.92 Å) K(1)-O(6) bond length. In the second K site, K(2) is bonded in a 9-coordinate geometry to one O(1), one O(5), one O(6), two equivalent O(2), two equivalent O(4), and two equivalent O(7) atoms. The K(2)-O(1) bond length is 2.68 Å. The K(2)-O(5) bond length is 2.84 Å. The K(2)-O(6) bond length is 2.94 Å. There is one shorter (3.12 Å) and one longer (3.23 Å) K(2)-O(2) bond length. There is one shorter (2.83 Å) and one longer (2.92 Å) K(2)-O(4) bond length. There is one shorter (2.81 Å) and one longer (3.14 Å) K(2)-O(7) bond length. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded in a tetrahedral geometry to one O(1), one O(3), one O(4), and one O(5) atom. The Mo(1)-O(1) bond length is 1.75 Å. The Mo(1)-O(3) bond length is 1.75 Å. The Mo(1)-O(4) bond length is 1.74 Å. The Mo(1)-O(5) bond length is 1.84 Å. In the second Mo site, Mo(2) is bonded in a 6-coordinate geometry to one O(3), one O(5), one O(6), one O(7), and two equivalent O(2) atoms. The Mo(2)-O(3) bond length is 2.27 Å. The Mo(2)-O(5) bond length is 2.06 Å. The Mo(2)-O(6) bond length is 1.74 Å. The Mo(2)-O(7) bond length is 1.73 Å. There is one shorter (1.82 Å) and one longer (2.22 Å) Mo(2)-O(2) bond length. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one Mo(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one K(1), two equivalent K(2), and two equivalent Mo(2) atoms. In the third O site, O(3) is bonded in a 3-coordinate geometry to one K(1), one Mo(1), and one Mo(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one K(1), two equivalent K(2), and one Mo(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one K(1), one K(2), one Mo(1), and one Mo(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one K(2), two equivalent K(1), and one Mo(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to two equivalent K(2) and one Mo(2) atom.