Synthesis and Characterization of Tetravalent Cerium Complexes with p-Tert-butylcalix［n］arenes (n=4, 6, 8)
来源期刊：JOURNAL OF RARE EARTHS2002年第1期
论文作者：增田嘉孝 严纯华 张亚文
Key words：rare earths; tetravalent cerium complex; p-t-butyl-calix［n］arene; spectroscopic characterization;
Abstract: Three Ce4+ complexes Ce(p-tert-butylcalix［4］arene)*(dmf)4*H2O (complex A), Ce(p-tert-butylcalix［6］arene)2*(dmf)10 (complex B) and Ce(p-tert-butylcalix［8］arene)*(dmf)4 (complex C) were prepared from N,N-dimethylforamide (dmf) solution of Ce(NO3)3. Their thermal stability, optical properties and coordination features were investigated with thermogravimetric and differential thermal analysis, ultraviolet and visible spectrophotometer, fluorescence spectrophotometer, infrared spectroscopy, and 1H NMR spectrometer. In the solvents of C6H6, 1,2-dichloroethane and dmf, complexes A and B can exhibit a ligand to metal charge transfer transition lying in ca. 20000 cm-1 in the electronic spectra. Complex A displays a dimeric structure in C6D6 solution. Ce4+ ions in the complexes are coordinated by phenolic groups of the ligands, oxygen atoms of dmf molecules, and / or OH- ions.
增田嘉孝1，严纯华2，张亚文2
(1.Diuision of Materials Science The Graduate School of Science and Technology,Kobe Uniuersity,Rokkodai,Nada-ku,Kobe 657,Japan;
2.State Key Laboratory of Rare Earth Materials Chemistry and Applications & PKU-HKU Joint Laboratory on Rare Earth Materials and Bioinorganic Chemistry, Peking University, Beijing 100871, China)
Abstract:Three Ce4+ complexes Ce(p-tert-butylcalix［4］arene)*(dmf)4*H2O (complex A), Ce(p-tert-butylcalix［6］arene)2*(dmf)10 (complex B) and Ce(p-tert-butylcalix［8］arene)*(dmf)4 (complex C) were prepared from N,N-dimethylforamide (dmf) solution of Ce(NO3)3. Their thermal stability, optical properties and coordination features were investigated with thermogravimetric and differential thermal analysis, ultraviolet and visible spectrophotometer, fluorescence spectrophotometer, infrared spectroscopy, and 1H NMR spectrometer. In the solvents of C6H6, 1,2-dichloroethane and dmf, complexes A and B can exhibit a ligand to metal charge transfer transition lying in ca. 20000 cm-1 in the electronic spectra. Complex A displays a dimeric structure in C6D6 solution. Ce4+ ions in the complexes are coordinated by phenolic groups of the ligands, oxygen atoms of dmf molecules, and / or OH- ions.
Key words:rare earths; tetravalent cerium complex; p-t-butyl-calix［n］arene; spectroscopic characterization;
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