Two new coordination compounds of rare earth chloride with N-acetyl-DL-alanine and imidazole have been prepared from absolute alcohol. The general formula RE(C5H8NO3)2(C3H5N2)2Cl3·4H2O (RE=Ce, Pr) of these compou...Two new coordination compounds of rare earth chloride with N-acetyl-DL-alanine and imidazole have been prepared from absolute alcohol. The general formula RE(C5H8NO3)2(C3H5N2)2Cl3·4H2O (RE=Ce, Pr) of these compounds were identified, by chemical and elemental analysis, FTIR spectra, UV spectra, 1H NMR and 13C NMR spectra, and molar conductance. The processes of thermal decomposition were identified by TG-DSC curves. The possible reaction mechanisms and the kinetics equation were investigated by comparing the kinetics parameters. The activation entropy of dehydration, as well as enthalpy values of dehydration and decomposition were obtained by DSC curve. The three-dimensional fluorescence spectra of liquid compounds were measured. The phenomenon of the up-conversion fluorescence is discussed.展开更多
Colorless crystal, [Ce(NO3)5H2O]· (C3N2H5) 2, has been obtained from the reaction of Ce(NO3) 3 with imdazole in the aqueous solution and its crystal structure has been determined by single crystal X-ray diffracti...Colorless crystal, [Ce(NO3)5H2O]· (C3N2H5) 2, has been obtained from the reaction of Ce(NO3) 3 with imdazole in the aqueous solution and its crystal structure has been determined by single crystal X-ray diffraction techniques. The crystal belongs to triclinic, space group P1. The cell parameters are: a = 0. 7489(l ) um, b = 0. 7914(2) nm, c = 1. 8139(3) nm, a = 89. 39(2)°, β = 89. 37(l） °,γ = 63. 18(2)°, Dc = 2. 1g. cm-3, Z = 2, R = 0. 0319. In the compound, all of five nitrates are bidentate and one molecule of water is monodentate, the coordination number of Ce (Ⅲ) is 11. The processes of thermal decomposition of the compound was proposed by its TG curve.展开更多
文摘Two new coordination compounds of rare earth chloride with N-acetyl-DL-alanine and imidazole have been prepared from absolute alcohol. The general formula RE(C5H8NO3)2(C3H5N2)2Cl3·4H2O (RE=Ce, Pr) of these compounds were identified, by chemical and elemental analysis, FTIR spectra, UV spectra, 1H NMR and 13C NMR spectra, and molar conductance. The processes of thermal decomposition were identified by TG-DSC curves. The possible reaction mechanisms and the kinetics equation were investigated by comparing the kinetics parameters. The activation entropy of dehydration, as well as enthalpy values of dehydration and decomposition were obtained by DSC curve. The three-dimensional fluorescence spectra of liquid compounds were measured. The phenomenon of the up-conversion fluorescence is discussed.
文摘Colorless crystal, [Ce(NO3)5H2O]· (C3N2H5) 2, has been obtained from the reaction of Ce(NO3) 3 with imdazole in the aqueous solution and its crystal structure has been determined by single crystal X-ray diffraction techniques. The crystal belongs to triclinic, space group P1. The cell parameters are: a = 0. 7489(l ) um, b = 0. 7914(2) nm, c = 1. 8139(3) nm, a = 89. 39(2)°, β = 89. 37(l） °,γ = 63. 18(2)°, Dc = 2. 1g. cm-3, Z = 2, R = 0. 0319. In the compound, all of five nitrates are bidentate and one molecule of water is monodentate, the coordination number of Ce (Ⅲ) is 11. The processes of thermal decomposition of the compound was proposed by its TG curve.
