KTa(AgSe2)2 crystallizes in the orthorhombic Ama2 space group. K(1) is bonded in a 5-coordinate geometry to one Se(1), two equivalent Se(2), and two equivalent Se(3) atoms. Ta(1) is bonded to one Se(1), one Se(3), and two equivalent Se(2) atoms to form TaSe4 tetrahedra that share edges with two equivalent Ag(1)Se4 tetrahedra and edges with two equivalent Ag(2)Se4 tetrahedra. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to two equivalent Se(1) and two equivalent Se(2) atoms to form distorted AgSe4 tetrahedra that share corners with two equivalent Ag(1)Se4 tetrahedra, corners with four equivalent Ag(2)Se4 tetrahedra, and edges with two equivalent Ta(1)Se4 tetrahedra. In the second Ag site, Ag(2) is bonded to one Se(1), one Se(3), and two equivalent Se(2) atoms to form distorted AgSe4 tetrahedra that share corners with four equivalent Ag(1)Se4 tetrahedra and edges with two equivalent Ta(1)Se4 tetrahedra. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a 5-coordinate geometry to one K(1), one Ta(1), one Ag(2), and two equivalent Ag(1) atoms. In the second Se site, Se(2) is bonded in a 4-coordinate geometry to one K(1), one Ta(1), one Ag(1), and one Ag(2) atom. In the third Se site, Se(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent K(1), one Ta(1), and one Ag(2) atom.
KTa(AgSe2)2 crystallizes in the orthorhombic Ama2 space group. K(1) is bonded in a 5-coordinate geometry to one Se(1), two equivalent Se(2), and two equivalent Se(3) atoms. The K(1)-Se(1) bond length is 3.87 Å. Both K(1)-Se(2) bond lengths are 3.74 Å. There is one shorter (3.62 Å) and one longer (3.75 Å) K(1)-Se(3) bond length. Ta(1) is bonded to one Se(1), one Se(3), and two equivalent Se(2) atoms to form TaSe4 tetrahedra that share edges with two equivalent Ag(1)Se4 tetrahedra and edges with two equivalent Ag(2)Se4 tetrahedra. The Ta(1)-Se(1) bond length is 2.49 Å. The Ta(1)-Se(3) bond length is 2.42 Å. Both Ta(1)-Se(2) bond lengths are 2.46 Å. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to two equivalent Se(1) and two equivalent Se(2) atoms to form distorted AgSe4 tetrahedra that share corners with two equivalent Ag(1)Se4 tetrahedra, corners with four equivalent Ag(2)Se4 tetrahedra, and edges with two equivalent Ta(1)Se4 tetrahedra. Both Ag(1)-Se(1) bond lengths are 2.67 Å. Both Ag(1)-Se(2) bond lengths are 2.64 Å. In the second Ag site, Ag(2) is bonded to one Se(1), one Se(3), and two equivalent Se(2) atoms to form distorted AgSe4 tetrahedra that share corners with four equivalent Ag(1)Se4 tetrahedra and edges with two equivalent Ta(1)Se4 tetrahedra. The Ag(2)-Se(1) bond length is 2.66 Å. The Ag(2)-Se(3) bond length is 2.65 Å. Both Ag(2)-Se(2) bond lengths are 2.66 Å. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a 5-coordinate geometry to one K(1), one Ta(1), one Ag(2), and two equivalent Ag(1) atoms. In the second Se site, Se(2) is bonded in a 4-coordinate geometry to one K(1), one Ta(1), one Ag(1), and one Ag(2) atom. In the third Se site, Se(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent K(1), one Ta(1), and one Ag(2) atom.