Synthesis and Crystal Structure of 2D Layer Lanthanum Polymer Constructed from Pyridine-3,4-dicarboxylate Ligand

A metal-organic coordination polymer {[La(PDC)(N-HPDC)].H2O}n (1) (H2PDC=pyridine-3,4-dicarboxylic acid) has been hydrothermally synthesized and structurally characterized by X-ray diffraction single-crystal structure determination,elemental analyses and IR spectroscopy. The complex crystallizes in the monoclinic system,space group P21/c with a=1.452 8(2) nm,b=0.681 59(11) nm,c=1.464 0(2) nm,β=94.270(2)°,V=1.445 6(4) nm3,Dc=2.243 Mg.m-3,Z=4,Mr=488.14,F (000)=944,μ (Mo Kα)=3.015 mm-1,R=0.031 0 and wR=0.076 2 for 2 424 observed reflections (I2σ(I)). There are La-O-C-O-C-La double chains in the complex. The chelating carboxylate O atoms and pyridyl N atoms lead the compound to 2D layers structure,which is extended to 3D supramolecular architecture through intermolecular hydrogen bonds. It is interesting that the polymer containing one-dimensional channels. CCDC:708868.