Rigid and Flexible Lanthanide Complexes with an Infinite Ln–O–Ln Framework: Synthesis, Structure and Properties

Abstract

A series of new lanthanide coordination polymers, Ln(pydc)(Hglu) (Ln = Nd(1), Pr(2); H2glu = glutaric acid; 2,5-H2pydc = 2,5-pyridine dicarboxylic acid), have been synthesized hydrothermally from the self-assembly of the lanthanide ions (Ln3+) with rigid 2,5-pyridine dicarboxylic acid and flexible glutaric acid. They were characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction. Structural analyses reveal that both of the complexes were crystallized in monoclinic space group P21/c and have intricate 3D net-structures, which contain an infinite 1D Ln–O–Ln chain structure. In addition, the phase purities of the bulk samples were identified by X-ray powder diffraction. The thermogravimetric analysis of 1 is discussed in detail. A new series of lanthanide coordination polymers have been synthesized hydrothermally from the self-assembly of the lanthanide ions (Ln3+) with rigid 2,5-pyridine dicarboxylic acid and the flexible glutaric acid. Structural analyses reveal that both complexes were crystallized in monoclinic space group P2 1 /c and have intricate 3D net-structures, which contain an infinte 1D Ln-O-Ln chain structure.