Lanthanide‐Coordination Polymers with Pyridinedicarboxylic Acids: Syntheses, Structures, and Luminescent Properties

Five lanthanide coordination polymers ( Ln ‐CPs) based on pyridine‐dicarboxylate and lanthanide metal ions were synthesized and characterized, namely [Sm(pydc)(Hpydc)(H 2 O) 5 ] · 4H 2 O ( 1 ) (H 2 pydc = 2, 5‐pyridine‐dicarboxylic acid), [Ho(pydc)(Hpydc)(H 2 O) 3 ] n · 4nH 2 O ( 2 ), [Ce(pydc)(bdc)(H 2 O)] n ( 3 ) (H 2 bdc = 1, 4‐benzenedicarboxylic acid), [Nd 2 (dipic) 3 (H 2 O) 3 ] n ( 4 ), and [Pr 2 Ag 2 (dipic) 4 (H 2 O) 5 ] n · 5nH 2 O ( 5 ) (H 2 dipic = 3, 5‐pyridine‐dicarboxylic acid). Complexes 1 and 2 display mononuclear structure and 1D zigzag chains, respectively. In complex 3 , the Ce III ions are connected through pydc 2– and bdc 2– ligands to generate an intricate 3D architecture. Complex 4 is constructed through dinuclear {Nd 2 } SBUs and oxygen bridging from carboxyl groups of dipic 2– to generate a 3D framework. In 5 , Pr III ions and Ag I ions are assembled into a 2D heterometallic layer, in which the rare Ag ··· Ag weak interactions are observed. Furthermore, the solid state luminescent properties of 1 – 4 were measured and discussed.