KCr(MoO4)2 crystallizes in the triclinic P-1 space group. K(1) is bonded in a 8-coordinate geometry to two O(1,1); two O(4,4); and four O(2,2) atoms. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form MoO4 tetrahedra that share corners with three Cr(1,1)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-55°. In the second Mo site, Mo(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form MoO4 tetrahedra that share corners with three Cr(1,1)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-55°. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form CrO6 octahedra that share corners with six Mo(1,1)O4 tetrahedra. In the second Cr site, Cr(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form CrO6 octahedra that share corners with six Mo(1,1)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one K(1), one Mo(1), and one Cr(1) atom. In the second O site, O(1) is bonded in a distorted bent 150 degrees geometry to one K(1), one Mo(1), and one Cr(1) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to two equivalent K(1) and one Mo(1) atom. In the fourth O site, O(2) is bonded in a distorted single-bond geometry to two equivalent K(1) and one Mo(1) atom. In the fifth O site, O(3) is bonded in a bent 150 degrees geometry to one Mo(1) and one Cr(1) atom. In the sixth O site, O(3) is bonded in a bent 150 degrees geometry to one Mo(1) and one Cr(1) atom. In the seventh O site, O(4) is bonded in a distorted trigonal planar geometry to one K(1), one Mo(1), and one Cr(1) atom. In the eighth O site, O(4) is bonded in a distorted trigonal planar geometry to one K(1), one Mo(1), and one Cr(1) atom.
KCr(MoO4)2 crystallizes in the triclinic P-1 space group. K(1) is bonded in a 8-coordinate geometry to two O(1,1); two O(4,4); and four O(2,2) atoms. Both K(1)-O(1,1) bond lengths are 2.99 Å. Both K(1)-O(4,4) bond lengths are 2.71 Å. There are two shorter (2.89 Å) and two longer (2.90 Å) K(1)-O(2,2) bond lengths. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form MoO4 tetrahedra that share corners with three Cr(1,1)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-55°. The Mo(1)-O(1) bond length is 1.80 Å. The Mo(1)-O(2) bond length is 1.72 Å. The Mo(1)-O(3) bond length is 1.76 Å. The Mo(1)-O(4) bond length is 1.80 Å. In the second Mo site, Mo(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form MoO4 tetrahedra that share corners with three Cr(1,1)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-55°. The Mo(1)-O(1) bond length is 1.80 Å. The Mo(1)-O(2) bond length is 1.72 Å. The Mo(1)-O(3) bond length is 1.76 Å. The Mo(1)-O(4) bond length is 1.80 Å. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form CrO6 octahedra that share corners with six Mo(1,1)O4 tetrahedra. Both Cr(1)-O(1) bond lengths are 1.98 Å. Both Cr(1)-O(3) bond lengths are 1.94 Å. Both Cr(1)-O(4) bond lengths are 1.96 Å. In the second Cr site, Cr(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form CrO6 octahedra that share corners with six Mo(1,1)O4 tetrahedra. Both Cr(1)-O(1) bond lengths are 1.98 Å. Both Cr(1)-O(3) bond lengths are 1.94 Å. Both Cr(1)-O(4) bond lengths are 1.97 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one K(1), one Mo(1), and one Cr(1) atom. In the second O site, O(1) is bonded in a distorted bent 150 degrees geometry to one K(1), one Mo(1), and one Cr(1) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to two equivalent K(1) and one Mo(1) atom. In the fourth O site, O(2) is bonded in a distorted single-bond geometry to two equivalent K(1) and one Mo(1) atom. In the fifth O site, O(3) is bonded in a bent 150 degrees geometry to one Mo(1) and one Cr(1) atom. In the sixth O site, O(3) is bonded in a bent 150 degrees geometry to one Mo(1) and one Cr(1) atom. In the seventh O site, O(4) is bonded in a distorted trigonal planar geometry to one K(1), one Mo(1), and one Cr(1) atom. In the eighth O site, O(4) is bonded in a distorted trigonal planar geometry to one K(1), one Mo(1), and one Cr(1) atom.