Synthesis and characterization of tetravalent cerium complexes with p-tert-butylcalix[n]arenes (n=4, 6, 8)

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 H-1 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.Chemistry, AppliedSCI(E)EI2ARTICLE141-462