| Abstract: Two isomorphous coordination polymers, {[Ln2(pda)3(H2O)2)·2H2O}n (Ln=Nd(1), La(2)), have been hydrothermally synthesized by reaction of rare-earth oxides and o-phenylenediacetic acid (H2pda). The two compounds have been characterized by X-ray single-crystal diffraction, infrared spectroscopy, fluorescence spectroscopy and TG analysis. Crystal structure determination shows that both two compounds crystallized in monoclinic, space group C2/c. Crystallographic parameters for complex 1, a=2.62906(18) nm, b=1.61172(11) nm, c=0.78327(5) nm, β=93.173(5)°, V=3.3139(4) nm3, Z=4, F(000)=1840, μ=3.173 mm-1, Dc=1.878 g·cm-3, R1=0.0226, wR2=0.0609; complex 2, a=2.6271(14) nm, b=1.6149(8) nm, c=0.7966(4) nm, β=92.850(9)°, V=3.3139(4) nm3, Z=4, F(000)=1816, μ=2.570 mm-1, Dc=1.823 g·cm-3, R1=0.0466, wR2=0.1416. In the two compounds, neighboring lanthanide ions are connected by o-phenylenediacetate to form 3D networks with stp topology. TG and FL analysis indicate that both compounds have good thermal stability and compound 2 exhibits emission in the solid state at room temperature. |
