Two new pH-controlled metal-organic frameworks based on polynuclear secondary building units with conformation-flexible cyclohexane-1,2,4,5-tetracarboxylate ligand

► The research on the conformation selection of flexible ligand cyclohexane-1,2,4,5-tetracarboxylic acid in coordination polymers by purposely adjusting the reaction pH values. ► The study on utilizing of versatile flexible conformations of cyclohexane-carboxylic acid ligands to construct SBUs. ► The solid state luminescence properties of two new zinc(II) coordination polymers.