Firstly, each ellagate ligand chelates to the Zr(IV) centres through a catecholate group which contributes a pair of adjacent oxygen atoms to the ZrO8 square antiprism coordination polyhedron. We have identified three possible combinations of such pairs to give eight vertices in a square antiprism (denoted as pairings 1, 2 and 3 in Fig. and Supplementary Fig. ). The coordination polyhedra become chiral when vertices are paired, and thus each complex has an enantiomeric opposite (denoted + and -), yet isomers of both handedness are present in each of the MOFs reported here as they crystallize in centrosymmetric space groups. Simplified representations of the ZrO8 coordination environments are shown in the bottom two rows of Fig. . These representations clearly indicate how the oxygen vertices are paired (1, 2 or 3). SU-102 has oxygen pairing type 2, while SU-105, SU-106 and SU-112 all have a type 1 pairing.