Synthesis, structure, photoluminescence and magnetic properties of lanthanide-pyridine-2,4,6-tricarboxylate coordination polymers

Two new lanthanide-pyridine-2,4,6-tricarboxylate coordination polymers [Pr(H2O)3(ptc)]⋅H2O (1) and [Tb2(H2O)9(ptc)2]·3H2O (2) (H3ptc = pyridine-2,4,6-tricarboxylic acid) have been synthesized and structurally characterized by single crystal X-ray diffraction. The compound (1) crystallize as 2D layer, which are further engaged in hydrogen bonding leading to a novel 3D supramolecular architecture. Complex (2) exists as a centrosymmetric tetranuclear unit, which are assembled into a 3D supramolecular architecture via extensively hydrogen bonding interaction. The luminescence experiments show that Pr(III) and Tb(III) compounds exhibit typical luminescence in the visible region. Besides luminescence, the magnetic properties of (1) and (2) were investigated and indicate the anti-ferromagnetic couplings between the Ln(III) ions.

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► 1 is a 2D herringbone-like topological nets.
► 2 is a centrosymmetric tetranuclear unit.
► The magnetic properties of 1 and 2 indicate the anti-ferromagnetic couplings.