Solventothermal syntheses, structures and photoluminescence of two-dimensional lanthanide coordination polymers with adipic acid

Four lanthanide coordination polymers formulated as [Ln2(Ad)3(H2O)4] · 0.25H2O ( Ln = Tb (I), Pr (II), Ho (III), Dy (IV); H2Ad = adipic acid), have been solventothermally synthesized from the self-assembly of the lanthanide ions (Ln3+) with the exible adipic dicarboxylate ligand. All of them were characterized by IR spectroscopy and single-crystal X-ray diffraction. Structural analyses revealed that these complexes had intricate two-dimensional interpenetrated metal-organic networks. In addition, the photoluminescent properties of complex I was discussed in detail, which shows strong green emission, corresponds to 5D4 → 7F5 transition of Tb3+ ions.