Syntheses, structures, and properties of 3D lanthanide coordination polymers based on pyridine-2,3,5,6-tetracarboxylate

Abstract

Three new 3D lanthanide(III) coordination polymers with the formulas {K[Ln(pdtc)(H₂O)]·H₂O}_n(Ln = Nd(1), Dy(2), Er(3); K₄pdtc = potassium pyridine-2,3,5,6-tetracarboxylate) have been synthesized via hydrothermal methods and structurally characterized by X-ray single crystal diffraction analysis, elemental analysis and thermal gravimetric analysis. In complexes 1–3, the pdtc⁴⁻ ligands adopt new coordination modes and the three complexes have similar 3D network structures which consist of dinuclear building units and novel K–O chains inserted into the structure. Furthermore, complex 2 shows corresponding characteristic luminescence and complex 3 exhibits weak antiferromagnetic properties.