A 2D pillar-layered coordination framework with meso-helix constructed from imidazole-4,5-dicarboxlylate and terephthalate

A new pillar-layered coordination framework [Er(H2O)(C5H2N2O4)(TA)0.5]n (1) has been hydrothermally synthesized by employing imidazole-4,5-dicarboxlylate (H3IDC) and terephthalate (H2TA) and structurally characterized. Single crystal X-ray diffraction analysis reveals that compound 1 exhibits the 2D pillar-layered coordination framework with meso-helical character constructed from auxiliary ligand TA2− (that is, pillar) bridging two [Er(HIDC2−)]n layers (namely, Δ- and Λ-layers), which is the first example of lanthanide coordination framework including imidazole-4,5-dicarboxlylate and terephthalate. Meanwhile, the thermogravimetric analysis shows compound 1 has high thermal stability.