Regioisomeric MOFs: A series of bifunctional metal–organic framework (MOF) regioisomers has been produced from amino-halo benzene dicarboxylate (NH2X-BDC) ligands. ZrIV- and ZnII-based MOFs were synthesized and for the flexbile ZnII-based MOFs, gas sorption properties were dependent on the ligand substitution pattern.