稀土硫氰酸盐与聚乙二醇固体配合物的合成与表征  

Synthesis and Characterization of Solid Coordination Compounds of Rare Earth Thiocyanate and Polyethylene Glycol

作　　者：倪兆艾[1] 朱建军[1] 

机构地区：[1]杭州大学化学系

出　　处：《杭州大学学报（自然科学版）》1990年第4期429-436,共8页Journal of Hangzhou University Natural Science Edition

摘　　要：在乙酸乙酯溶液中合成了十五种稀土硫氰酸盐与开环聚醚,三缩四乙二醇(简写EO4)的固体配合物.用元素分析,红外光谱,差热和热重分析,核磁共振,X射线粉末衍射及摩尔电导等方法对配合物进行了表征.配合物的组成为RE(SCN)_3·EO_4·H_2O.从TG-DTA分析表明,除镧的配合物外其他配合物在160℃—260℃能生成RE:EO_4为4:3的新配合物.The fifteen complexes of rare earth thiocyanates (RE:La-Lu and Y except Pm ) with tetraethylene glycol(EO4) are prepared in ethyl acetate and characterized by elemental analysis, IR, x-ray powder diffraction, TG and DTA. Their general formula is RE(SCN)3-(EO4)-H2O. All complexes have almost the same IR spectra, but they are different from that of the free ligand.C-O-C strenching vibration in the complexes undergoes splitting and shifts to lower frequency at about 70 cm-1 as compared with that of the free EO4. SCN group band which is about 2070 cm-1 in the complexes when it is 2100 cm-1 in the pure thiocyanates.This result indicates that N atom of SCN group is coordinated to RE. The complexes appear at 1600-1650 cm-1 (H-O-H vibration) broad band absorption. It demonstrates that the complexes contain water. The TG and DTA curves of the complexes are different from that of the pure thiocyanates. All the complexes have an endothermal peak at 100℃-150℃ with loss of water molecules. The complexes except La have an endothermal peak at 155-℃192℃ with decreasing of weight. The analysis shows that the complexes lose EO4 and form new 4:3(RE:EO4) complexes. This result is similar to that of rare earth complexes of some crown ethers. The molar conductivity value of the complexes in acetone indicates that they are non-electrolytes.

关 键 词：稀土元素 硫氰酸盐 聚乙二醇 

分 类 号：O614.33[理学—无机化学]