Figure 1
Some different linkages in borate structures and their corresponding topologies: (a) two normal-ring FBBs connected by an O atom, which is the so-called `linear combination'; (b) two normal-ring FBBs connected by a borate tetrahedron, which form an `8'-shaped-ring FBB; (c) two normal-ring FBBs connected by two borate tetrahedra, which form a bridge-ring FBB. |