U(Ⅳ)配合物UNa2(pdc)3·6H2O的合成、结构及磁性研究

合成了一种含有+4价铀的配合物UNa2(pdc)3·6H2O(H2pdc=吡啶-2,6-二羧酸), 并详细研究了其晶体结构和磁学性质. 晶体属于单斜晶系, P21/n空间群, 晶胞参数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. 化合物的中心铀原子为九配位, π-π相互作用和氢键使得该化合物形成了三维立体结构.

Synthesis, Structure and Magnetic Property of a Novel U(Ⅳ) Coordination Compound: UNa2(pdc)3·6H2O

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).