Two-dimensional 3d–4f coordination polymers based on compartment compounds: [NiLn(L)(NO3)2(4-pca)(H2O)] (Ln = Nd, Eu, Tb; H2L = 1,3-bis((3-methoxysalicylidene)amino)propane); 4-Hpca = pyridine-4-carboxylic acid)

This paper describes the preparation and properties of Ni–Nd, Ni–Eu, and Ni–Tb coordination polymers, by using dinuclear 3d–4f compartment compounds as secondary building units. Under microwave-heating conditions in acetonitrile, two-dimensional 3d–4f coordination polymers, [NiLn(L)(NO3)2(4-pca)(H2O)] {Ln = Nd (1), Eu (2), Tb (3)}, were prepared from [NiLn(L)(NO3)(CH3CN)(H2O)4](NO3)2(H2O) and pyridine-4-carboxylic acid (4-Hpca). X-ray diffraction studies of polymers 1 and 2 clearly revealed that the pyridine terminal of the compartment ligand (L) is coordinated to the d-block metal (Ni) and the carboxylate terminal is coordinated the f-block metal (Nd or Eu). Compounds 2 and 3 exhibited the emission quenching of the Ln3+ ion, which probably arises from the Ln3+ → Ni2+ energy transfer.

Graphical abstractThis paper describes the preparation and properties of three Ni–Ln (Nd, Eu, Tb) coordination polymers, by using dinuclear 3d–4f compartment compounds as secondary building units. The polymers exhibited the emission quenching of the Ln3+ ion, which probably arises from the Ln3+ → Ni2+ energy transfer.Figure optionsDownload full-size imageDownload as PowerPoint slide