稀土硝酸盐与含氮冠醚(2,2)配合物的合成及其晶体结构

SYNTHESES AND CRYSTAL STRUCTURES OF COMPLEXES OF LANTHANIDE NITRATE WITH CROWN ETHER (2,2)

用X射线衍射法测定了稀土硝酸盐与冠醚(2,2)配合物Ln(NO_3)_3·(2,2)(Ln=Ce、Pr、Nd)的晶体结构。发现配合物具有与Eu(NO_3)_3(2,2)不同的配位方式。用“堆积比饱和规律”对结构差异原因作了初步的讨论。配合物均属三斜晶系空间群P,Z=2。

The complexes of lanthanide nitrate with crown ether (2,2), Ln(NO_3)_3(2,2) (Ln=ce, Pr, Nd),have been synthesed and the crystal structures have been determi ned by x-ray diffraction method. The results show that the structure of compounds differed from that of Eu(NO_3)_3 (2,2). Reason of this difference was disscused in the light of 'Packing Saturation Rule'.All complexes are triclinic,, space group p1, Z=2, with dimensions: Ce(NO_3)_3 (2,2), Pr(NO_3)_3(2,2), Nd(NO_3)_3(2,2); a=10.281(3), 10.279(2), 10.277(4); b=12.742(4), 12.748(3), 12.738(5); c=8.917(1), 8.897(2), 8.895(a); α=103.80(2), 103.77(2), 103.78(3)°; β=112.81(2), 112.83(2), 112.75(3)°; γ=83.82(2), 83.84(2), 83.93(3)°; ν=1045.5(5), 1043.0(4), 1042.8(7)~3.