硝酸铈(III)与二苯并-18-冠-6配合物的合成、表征和结构

本文报导了硝酸铈(III)与二苯并-18-冠-6配合物单晶的制备, 研究了其物理化学性质, 并用用X射线单晶衍射法测定该配合物的晶体和分子结构.

Synthesis, characterization, crystal and molecular structure of complex of cerium (III) nitrate with dibenzo-18-crown-6

The single crystal of Ce(NO3)3.L (L = dibenzo-18-crown-6) was prepared and characterized by elemental analyses, IR spectra, molar conductance, DTA and thermogravimetry. The structure of this complex was determine by x-ray single crystal diffraction anal. The crystal of the complex is tetragonal, space group P41212 with a 8.649(3), c 33.388(21)? Z = 4, dc = 1.83, d0 = 1.82 g/cm3. The cerium ion lies more or less at the center of the ring consisting of 6 O atoms of the crown. The 3 nitrate groups in the complex are bidentate and 2 of them are coordinated on the less hindered side while the other is bonded on the opposite side. The coordination no. of Ce(III) ion is 12. The average bond lengths are 2.648?for the 6 Ce-O(crown) bonds and 2.664?for the 6 Ce-O(NO3-) bonds.