Chemical Research in Chinese Universities ›› 2009, Vol. 25 ›› Issue (6): 796-800.

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Two Novel Lanthanide Coordination Polymers with Differently Bridging Pyridine-2,4,6-tricarboxylate Ligand

CHEN Zi-yun and PENG Meng-xia*   

  1. Department of Chemistry, Jiaying University, Meizhou 514015, P. R. China
  • Received:2008-12-15 Revised:2009-06-29 Online:2009-11-25 Published:2010-01-25
  • Contact: PENG Meng-xia. E-mail: pengmx123@sina.com
  • Supported by:

    Supported by the Scientific and Technological Project of Guangdong Province, China(No.2006B36703005).

Abstract:

Two new lanthanide-pyridinetricarboxylic complexes formulated as [Lu(pyta)(H2O)3](1) and [La(pyta)(H2O)2]·1.5H2O(2) were synthesized through hydrothermal reactions of LuCl3 or La(NO3)3·6H2O with pyridine-2,4,6-tricarboxylic acid(H3pyta), respectively, and characterized by X-ray crystallography. Complex 1 crystallized in the monoclinic system with space group P21/n, a=1.01930(12) nm, b=0.73423(9) nm, c=1.45449(17) nm, β=94.734(2)°, V=1.0848(2) nm3, Z=4. Complex 2 crystallized in the monoclinic system with space group P21/c, a=0.68474(8) nm, b=1.20982(15) nm, c=1.36063(17) nm, β=99.823(2)°, V=1.1106(2) nm3, Z=4. The overall structure of complex 1 consists of 2D binuclear Lu2(pyta)4-based grid coordination layers which are further extended into a 3D supramolecular architecture via hydrogen bonding interactions. With different coordination modes of the pyta ligand, complex 2 is a 3D porous network comprised of La-carboxylate framework.

Key words: Pyridine-2,4,6-tricarboxylic acid; Lu(III); La(III); Hydrothermal method