K2Be2Co(O3F4)2 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one F(2), one F(4), two equivalent F(1), and two equivalent F(3) atoms. Be(1) is bonded in a tetrahedral geometry to one F(1), one F(2), one F(3), and one F(4) atom. Co(1) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Co(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one K(1) and one Co(1) atom. In the third O site, O(3) is bonded in a single-bond geometry to one K(1) and one Co(1) atom. There are four inequivalent F sites. In the first F site, F(4) is bonded in a distorted bent 120 degrees geometry to one K(1) and one Be(1) atom. In the second F site, F(1) is bonded in a distorted single-bond geometry to two equivalent K(1) and one Be(1) atom. In the third F site, F(2) is bonded in a distorted single-bond geometry to one K(1) and one Be(1) atom. In the fourth F site, F(3) is bonded in a single-bond geometry to two equivalent K(1) and one Be(1) atom.
K2Be2Co(O3F4)2 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one F(2), one F(4), two equivalent F(1), and two equivalent F(3) atoms. The K(1)-O(2) bond length is 3.03 Å. The K(1)-O(3) bond length is 3.10 Å. The K(1)-F(2) bond length is 2.69 Å. The K(1)-F(4) bond length is 2.62 Å. There is one shorter (2.65 Å) and one longer (2.71 Å) K(1)-F(1) bond length. There is one shorter (2.85 Å) and one longer (2.90 Å) K(1)-F(3) bond length. Be(1) is bonded in a tetrahedral geometry to one F(1), one F(2), one F(3), and one F(4) atom. The Be(1)-F(1) bond length is 1.56 Å. The Be(1)-F(2) bond length is 1.60 Å. The Be(1)-F(3) bond length is 1.55 Å. The Be(1)-F(4) bond length is 1.55 Å. Co(1) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Both Co(1)-O(1) bond lengths are 1.82 Å. Both Co(1)-O(2) bond lengths are 1.80 Å. Both Co(1)-O(3) bond lengths are 1.77 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Co(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one K(1) and one Co(1) atom. In the third O site, O(3) is bonded in a single-bond geometry to one K(1) and one Co(1) atom. There are four inequivalent F sites. In the first F site, F(4) is bonded in a distorted bent 120 degrees geometry to one K(1) and one Be(1) atom. In the second F site, F(1) is bonded in a distorted single-bond geometry to two equivalent K(1) and one Be(1) atom. In the third F site, F(2) is bonded in a distorted single-bond geometry to one K(1) and one Be(1) atom. In the fourth F site, F(3) is bonded in a single-bond geometry to two equivalent K(1) and one Be(1) atom.