Abstract: Uranium is the most extensively studied element in actinide chemistry. In the past few years, many uranyl coordination compounds had been synthesized, whereas the report on the U(Ⅳ) cooridination compounds is much less. Here we reported the synthesis, crystal structure and magneticproperty of a novel U(Ⅳ) coordination compound UNa₂(pdc)_3^·6H₂O(H₂pdc=pyridine-2,6-dicarboxylic acid). The title compound crystallized in the monoclinic space group P2₁/n, with unit cell parameters a=1.0205(2) nm, b=2.2221(4) nm, c=1.2537(3) nm, β=94.98(3)°, V=2.8323(10) nm³, Z=4. The centered uranium atom is bonded to three pdc ligands via three nitrogen atoms and six oxygen atoms in a tricapped trigonal prismatic coordination. The temperature dependence of magnetic susceptibility reciprocal curve shows that the title compound has a paramagnetic behavior which obey to Curie-Weiss equation above 50 K(C=1.01 cm³·K·mol^-1, θ＝-63.21 K).

Key words: Coordination compound, Actinide element, Cryst al structure, Magnetic property, Uranium