稀土硝酸盐与四溴二苯并-18-冠-6固体配合物的合成与性质

Synthesis and Properties of Solid Complexes of Rare Earth Nitrates with Tetrabromodibenzo-18-Crown-6

在非水溶剂中合成了三种未见报道的四溴二苯并-18-冠-6(L)与硝酸?、硝酸铈和硝酸铵的M∶L为1∶1型非溶剂合、不含水的固体配合物.对此进行了元素分析、红外光谱、紫外光谱、差热-热重分析和X-射线粉末衍射分析.红外光谱等结果表明-Br未参与配位,而冠醚氧原子与金属离子直接配位,NO_3^-为双齿配位,故可推测配合物中心离子的配位数为12.

Three new solid coordination compounds of La^(3+), Ce^(3+) and Nd^(3+) nitrates with tetrabromodibenzo-18-crown-6 (L) have been synthesized in non-aqueous solution. The compositions of them are La(NO_3)_3 · C_(20)H_(20)O_6Br_4, Ce(NO_3)_3 · C_(20)O_6Br_4 and Nd (NO_3)_3 · C_(20) · H_(20)O_6Br_4. All the complexes have been characterized by element analysis, IR, UV-DTA and X-ray power diffraction analysis. According to IR spectra, -Br is not coordinated but the NO_3^- are bidentate (C_(2V). The IR data show that the oxygen atoms of crown ethers are coordinated with rare earth cations directly, so we can speculate the number of the complexes is 12.