New flexible bis-pyridyltetrazole ligands for use in coordination polymer formation: Synthesis and structural studies

• Three bis-tetrazole ligands containing carboxylate groups were synthesised.
• Formation of coordination polymers and metal-organic frameworks.
• Polymorphism was exhibited by one of the ligands.

In this work, we have further developed the pyridyl-tetrazole ligand systems into bis-tetrazole systems, where the linker introduced to join these moieties was a flexible (CH2)3 backbone, with the intention of forming frameworks with potential voids. We synthesised three different pyridyl-tetrazoles linked via this flexible backbone through the pyridine ring and not the tetrazole rings. Two crystals of ligand 1 were solved by X-ray crystallography and showed interesting polymorphism. No crystals of the copper(II) complexes of the ligands could be obtained, suggesting that they were polymeric in nature.

Three novel bis-tetrazole ligands containing carboxylate functional groups on the tetrazole rings and a flexible (CH2)3 linker unit, for the construction of coordination polymers when coordinated to copper(II) ions, were synthesised and structurally characterised. Polymorphism was exhibited by one of the ligands.Figure optionsDownload as PowerPoint slide