Acta Phys. -Chim. Sin. ›› 2009, Vol. 25 ›› Issue (08): 1545-1549.doi: 10.3866/PKU.WHXB20090739

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Syntheses, Structures and Luminescent Properties of the Heterometallic Complexes [Ln2Zn2(2,5-pydc)5(H2O)2]·4H2O

WANG Chun-Guang, XING Yong-Heng, XIE Yan, LI Zhang-Peng, LI Jing, ZENG Xiao-Qing, GE Mao-Fa   

  1. College of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, Liaoning Province, P. R. China|Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
  • Received:2009-03-26 Revised:2009-04-27 Published:2009-07-16
  • Contact: XING Yong-Heng


The new heterometallic coordination polymers [Ln2Zn2(2,5-pydc)5(H2O)2]·4H2O (Ln=Sm (1) and Ln=Eu (2); 2,5-pydc: 2,5-pyridinedicarboxylic acid) were synthesized from the reaction of Ln2O3 and Zn(CH3COO)2·2H2O with corresponding ligands under hydrothermal conditions. The complexes were characterized by elemental analysis, IR spectroscopy, powder X-ray diffraction (XRD) and single crystal X-ray diffraction. Structural analyses reveals that complexes 1 and 2 are isomorphous and crystallize in the monoclinic space group P21/c. In complexes 1 and 2, there are two kinds of coordination modes for the 2,5-pyridinedicarboxylic acid ligand. Ln and Zn are connected to form a two dimensional (2D) layer structure by coordination mode I of 2,5-pyridinedicarboxylic acid and the layers further link to each other to forman intricate three dimensional (3D) network by coordination mode II. In addition, the luminescent properties and thermogravimetric (TG) analyses of the title complexes were analyzed in detail. The luminescence of Sm and Eu in these complexes was greatly improved because of the introduction of Zn.

Key words: Hydrothermal synthesis, Lanthanide-zinc coordination polymer, Crystal structure, Luminescent property


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