Be(CoO2)2 crystallizes in the orthorhombic Pnma space group. Be(1) is bonded in a trigonal planar geometry to one O(2), one O(3), and one O(4) atom. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms to form a mixture of corner and edge-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles range from 59-60°. In the second Co site, Co(2) is bonded to one O(3), two equivalent O(4), and three equivalent O(1) atoms to form a mixture of corner and edge-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles range from 59-60°. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Co(1) and three equivalent Co(2) atoms to form distorted OCo4 trigonal pyramids that share corners with five equivalent O(3)BeCo3 tetrahedra, corners with five equivalent O(4)BeCo3 tetrahedra, corners with two equivalent O(1)Co4 trigonal pyramids,  an edgeedge with one O(4)BeCo3 tetrahedra, and edges with two equivalent O(1)Co4 trigonal pyramids. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Be(1) and two equivalent Co(1) atoms. In the third O site, O(3) is bonded to one Be(1), one Co(2), and two equivalent Co(1) atoms to form distorted OBeCo3 tetrahedra that share  a cornercorner with one O(4)BeCo3 tetrahedra, corners with two equivalent O(3)BeCo3 tetrahedra, corners with five equivalent O(1)Co4 trigonal pyramids, and edges with two equivalent O(4)BeCo3 tetrahedra. In the fourth O site, O(4) is bonded to one Be(1), one Co(1), and two equivalent Co(2) atoms to form distorted OBeCo3 tetrahedra that share  a cornercorner with one O(3)BeCo3 tetrahedra, corners with two equivalent O(4)BeCo3 tetrahedra, corners with five equivalent O(1)Co4 trigonal pyramids, edges with two equivalent O(3)BeCo3 tetrahedra, and  an edgeedge with one O(1)Co4 trigonal pyramid.
Be(CoO2)2 crystallizes in the orthorhombic Pnma space group. Be(1) is bonded in a trigonal planar geometry to one O(2), one O(3), and one O(4) atom. The Be(1)-O(2) bond length is 1.51 Å. The Be(1)-O(3) bond length is 1.54 Å. The Be(1)-O(4) bond length is 1.56 Å. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms to form a mixture of corner and edge-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles range from 59-60°. The Co(1)-O(1) bond length is 1.99 Å. The Co(1)-O(4) bond length is 1.93 Å. Both Co(1)-O(2) bond lengths are 1.88 Å. Both Co(1)-O(3) bond lengths are 1.95 Å. In the second Co site, Co(2) is bonded to one O(3), two equivalent O(4), and three equivalent O(1) atoms to form a mixture of corner and edge-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles range from 59-60°. The Co(2)-O(3) bond length is 1.95 Å. Both Co(2)-O(4) bond lengths are 1.94 Å. There are two shorter (1.94 Å) and one longer (1.95 Å) Co(2)-O(1) bond length. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Co(1) and three equivalent Co(2) atoms to form distorted OCo4 trigonal pyramids that share corners with five equivalent O(3)BeCo3 tetrahedra, corners with five equivalent O(4)BeCo3 tetrahedra, corners with two equivalent O(1)Co4 trigonal pyramids,  an edgeedge with one O(4)BeCo3 tetrahedra, and edges with two equivalent O(1)Co4 trigonal pyramids. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Be(1) and two equivalent Co(1) atoms. In the third O site, O(3) is bonded to one Be(1), one Co(2), and two equivalent Co(1) atoms to form distorted OBeCo3 tetrahedra that share  a cornercorner with one O(4)BeCo3 tetrahedra, corners with two equivalent O(3)BeCo3 tetrahedra, corners with five equivalent O(1)Co4 trigonal pyramids, and edges with two equivalent O(4)BeCo3 tetrahedra. In the fourth O site, O(4) is bonded to one Be(1), one Co(1), and two equivalent Co(2) atoms to form distorted OBeCo3 tetrahedra that share  a cornercorner with one O(3)BeCo3 tetrahedra, corners with two equivalent O(4)BeCo3 tetrahedra, corners with five equivalent O(1)Co4 trigonal pyramids, edges with two equivalent O(3)BeCo3 tetrahedra, and  an edgeedge with one O(1)Co4 trigonal pyramid.