Synthesis, structures and luminescence of two lanthanide coordination polymers based on 2,4-pyridinedicarboxylic acid

• Published in: Journal of solid state chemistry 2019-11, Vol.279, p.120931, Article 120931
• Main Authors: Chen, Yanmei, Liu, Shanshan, Gao, Rui, Wang, Yang, Zhang, Wanju, Ju, Zhenghua
• Format: Article
• Language: English
• Subjects: Lanthanide coordination polymers; Luminescence; Single crystal structure; Topology structure
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2019.120931

Two Lanthanide coordination polymers [(H3O)Eu3(PDA)6]2-·2H3O+·12H2O (1) and [Tb3(PDA)4(HO)(H2O)2]·2H2O (2) (H2PDA = 2,4-pyridinedicarboxylic acid), have been hydrothermally synthesized and characterized by elemental analysis, IR, TG, XRD as well as single-crystal X-ray diffraction. Both complexes are crystallized in the tetragonal system, P41212 space group, but they have different three-dimensional coordination frameworks. 2,4-PDA2- ligand exhibits μ4-(κ5N,O2:O2’:O4:O4’), μ4-(κ5N,O2:O2,O2’:O4:O4’) and μ1-(κ5N,O2) coordination modes in the complexes. Both of them can be simplified to a new topology, with the Schläfli symbol of {36‧416‧56}. The luminescence properties for the two complexes were determined with solid samples. Complexes 1 and 2 show typical red and bright-green luminescence of EuIII and TbIII, respectively. Treatment of pyridine-2,4-dicarboxylate with Eu(III) nitrate (or Tb(III) nitrate) under hydrothermal conditions gives two different 3D coordination polymers. Interestingly, they can be simplified to the same new topology, with the Schläfli symbol of {36‧416‧56}. Complexes 1 and 2 show typical red and bright-green luminescence of EuIII and TbIII, respectively. [Display omitted] •Two Lanthanide coordination polymers were prepared by hydrothermal reaction.•The topology structure of 1 and 2 was similar, and the point symbol of {36‧416‧56}.•The luminescence of 1 and 2 was investigated.