A series of lanthanide coordination polymers with 4′-(4-carboxyphenyl)-2,2′:6′,2″-terpyridine: Syntheses, crystal structures and luminescence properties

A series of lanthanide coordination polymers, [Ln(cptpy)3]n [Ln = Sm (1), Eu (2), Tb (3), Dy (4), Hcptpy = 4′-(4-carboxyphenyl)-2,2′:6′,2″-terpyridine] have been prepared under hydrothermal conditions and characterized by IR, Elemental analysis, single crystal X-ray diffraction. Compounds 1–4 are isostructural with 1D framework, in which all LnIII atoms are nine-coordinated and (cptpy)− anions adopt two different coordination modes. The network packed through π···π stacking interactions and C–H···π interactions to form a 3D supramolecular structure without solvent molecules. In addition, the thermal stabilities and luminescence properties were also studied.

Graphical AbstractA series of lanthanide coordination polymers, [Ln(cptpy)3]n [Ln = Sm (1), Eu (2), Tb (3), Dy (4), Hcptpy = 4′-(4-carboxyphenyl)-2,2′:6′,2″-terpyridine] have been prepared under hydrothermal conditions and characterized. Their photoluminescence properties were also studied. The thermal stabilities and lifetime of 2 were further studied.Figure optionsDownload full-size imageDownload as PowerPoint slideResearch Highlights► A series of lanthanide coordination polymers, [Ln(cptpy)3]n have been prepared. ► The 3D supramolecular structure is formed through π···π and C–H···π interactions. ► The (cptpy)- anion can efficiently sensitize EuIII luminescence.