KBi2F7 crystallizes in the triclinic P1 space group. K(1) is bonded in a 5-coordinate geometry to two equivalent F(4) and three equivalent F(2) atoms. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 7-coordinate geometry to one F(2), one F(7), two equivalent F(1), and three equivalent F(6) atoms. In the second Bi site, Bi(2) is bonded in a 7-coordinate geometry to one F(4), one F(7), two equivalent F(3), and three equivalent F(5) atoms. There are seven inequivalent F sites. In the first F site, F(1) is bonded in a distorted bent 120 degrees geometry to two equivalent Bi(1) atoms. In the second F site, F(2) is bonded to three equivalent K(1) and one Bi(1) atom to form corner-sharing FK3Bi tetrahedra. In the third F site, F(3) is bonded in a bent 120 degrees geometry to two equivalent Bi(2) atoms. In the fourth F site, F(4) is bonded in a distorted trigonal non-coplanar geometry to two equivalent K(1) and one Bi(2) atom. In the fifth F site, F(5) is bonded in a 2-coordinate geometry to three equivalent Bi(2) atoms. In the sixth F site, F(6) is bonded in a 3-coordinate geometry to three equivalent Bi(1) atoms. In the seventh F site, F(7) is bonded in a distorted bent 120 degrees geometry to one Bi(1) and one Bi(2) atom.
KBi2F7 crystallizes in the triclinic P1 space group. K(1) is bonded in a 5-coordinate geometry to two equivalent F(4) and three equivalent F(2) atoms. There is one shorter (2.84 Å) and one longer (2.86 Å) K(1)-F(4) bond length. There are a spread of K(1)-F(2) bond distances ranging from 2.65-2.78 Å. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 7-coordinate geometry to one F(2), one F(7), two equivalent F(1), and three equivalent F(6) atoms. The Bi(1)-F(2) bond length is 2.19 Å. The Bi(1)-F(7) bond length is 2.52 Å. There is one shorter (2.25 Å) and one longer (2.47 Å) Bi(1)-F(1) bond length. There are a spread of Bi(1)-F(6) bond distances ranging from 2.27-2.68 Å. In the second Bi site, Bi(2) is bonded in a 7-coordinate geometry to one F(4), one F(7), two equivalent F(3), and three equivalent F(5) atoms. The Bi(2)-F(4) bond length is 2.27 Å. The Bi(2)-F(7) bond length is 2.25 Å. There is one shorter (2.18 Å) and one longer (2.54 Å) Bi(2)-F(3) bond length. There are a spread of Bi(2)-F(5) bond distances ranging from 2.29-2.76 Å. There are seven inequivalent F sites. In the first F site, F(1) is bonded in a distorted bent 120 degrees geometry to two equivalent Bi(1) atoms. In the second F site, F(2) is bonded to three equivalent K(1) and one Bi(1) atom to form corner-sharing FK3Bi tetrahedra. In the third F site, F(3) is bonded in a bent 120 degrees geometry to two equivalent Bi(2) atoms. In the fourth F site, F(4) is bonded in a distorted trigonal non-coplanar geometry to two equivalent K(1) and one Bi(2) atom. In the fifth F site, F(5) is bonded in a 2-coordinate geometry to three equivalent Bi(2) atoms. In the sixth F site, F(6) is bonded in a 3-coordinate geometry to three equivalent Bi(1) atoms. In the seventh F site, F(7) is bonded in a distorted bent 120 degrees geometry to one Bi(1) and one Bi(2) atom.