s-Triazine-Based Ligands Possessing Identical Heteroatom-Bridged Substituents—Unexpected Triazine-O Bond Cleavage

Metal-organic frameworks (MOFs) are materials with extremely valuable properties. The latter depend largely on the ligand used; therefore, the design of new organic linkers is a priority task today. A series of <i>s</i>-triazines possessing variable heteroatom-bridged identical substituents, useful ligands for the synthesis of MOFs, is obtained in good to excellent yields. The problem of obtaining free carboxyl groups without forming salts with nitrogen atoms is solved. The products are characterized by NMR spectra and single crystal XRD of selected samples. Unexpected O-triazine bond cleavage under basic hydrolysis conditions is observed.