“…As an important family of multidentate O-donor ligands, organic aromatic tetracarboxylate ligands, such as 1,2,4,5-benzenetetracarboxylate (1,2,4,5-btec), have been extensively employed in the preparation of such metal−organic compounds . Furthermore, the new tetracarboxylate ligands, 3,3‘,4,4‘-benzophenonetetracarboxylate 1a and 1,4,5,8-naphthalenetetracarboxylate, were also reported recently. However, the carboxyl groups on the above-mentioned aromatic rings are all rigid, which to some degree limit the outspread in 3D direction of metal−organic frameworks and hinder the assembly of certain crystalline products 6a…”