The crystal structure of the title compound UO2(NO3)2[CH2(CH2)2CONC8H17] was determined by single-crystal X-ray diffraction. Crystal data: triclinic, space group P , a = 7.456(2), b = 8.371(2), c = 13.470(3) ? ?= 95.6...The crystal structure of the title compound UO2(NO3)2[CH2(CH2)2CONC8H17] was determined by single-crystal X-ray diffraction. Crystal data: triclinic, space group P , a = 7.456(2), b = 8.371(2), c = 13.470(3) ? ?= 95.66(1), ?= 94.64(2), ?= 102.67(2), C24H46N4O10U, Mr = 788.68, V = 811.7(3) ?, Dc = 1.613 g/cm3, Z = 1, F(000) = 390, ?= 5.052 mm-1, the final R = 0.0256 and wR = 0.0568 for 2826 observed reflections (I > 2(I)). The central uranyl ions are coordinated by six oxygen atoms. Two of them are from the carbonyl groups of N-octyl-a-pyrrolidone molecules, and the other four from two nitrate groups.展开更多
The extraction behavior of N,N-diethyl-N,N-dibenzenyl-urea（DEDBU）and N,N-dimethyl-N,N-dibenzenyl-urea（DMDBU）to uranium（VI）and thorium（IV）from nitric acid solution was studied by using xylene or chloroform as d...The extraction behavior of N,N-diethyl-N,N-dibenzenyl-urea（DEDBU）and N,N-dimethyl-N,N-dibenzenyl-urea（DMDBU）to uranium（VI）and thorium（IV）from nitric acid solution was studied by using xylene or chloroform as diluent.The effect of aqueous HNO3 concentration,extractant concentration,salting-out agent concentration and aqueous UO2+2/Th4+concentration on extraction distribution ratio of U（VI）and Th（IV）was determined.The results show that the extraction behavior of the extractants DEDBU and DMDBU to U（VI）is similar to that of TBP,the solvation numbers both are two.Under the experimental condition,the extractants DEDBU and DMDBU do not show the extraction behatvior to Th（IV）.This means that the estractants may have potential application to separate U（VI）and Th（IV）.展开更多
The extraction of uranyl nitrate was studied with newly synthesized unsymmetrical alkylamides, N-methyl-N-octyloctylamide (MOOA), N-methyl-N-octyldecanamide (MODA), and N-methyl-N-octyldodecanamide (MODOA), employing ...The extraction of uranyl nitrate was studied with newly synthesized unsymmetrical alkylamides, N-methyl-N-octyloctylamide (MOOA), N-methyl-N-octyldecanamide (MODA), and N-methyl-N-octyldodecanamide (MODOA), employing n-octane as diluent. The effect of the concentrations of nitric acid, sodium nitrate and extractants on the extraction was investigated and the extraction mechanism was suggested. The effect of temperature on the extraction was also studied and the related thermodynamic functions were calculated. The extracted species were characterized by FTIR spectrometry.展开更多
The novel unsymmetrical extractant N,N′-dimethyl-N,N′-dioctylmalonamide (DMDOMA) was prepared by reaction of diethyl malonate with N-methyl octanamine. The extraction mechanism and the behavior of uranyl nitrate wit...The novel unsymmetrical extractant N,N′-dimethyl-N,N′-dioctylmalonamide (DMDOMA) was prepared by reaction of diethyl malonate with N-methyl octanamine. The extraction mechanism and the behavior of uranyl nitrate with DMDOMA employed cyclohexane as diluent were studied. The effects of concentrations of nitric acid, sodium nitrate, extractant and also the temperature on the extraction were considered. The stoichiometry of the extracted species is and the coordination of extracted species was suggested based on the IR data. The value of ΔH of extraction is -26.9 ± 0.80 kJ·mol-1. The value of the apparent extraction constant is 133.88 ± 17.92, which shows that the optimization of extractant structure improves the extractability of malonamide for uranyl nitrate.展开更多
The complex UO2(DDPEZ)(NO3)2 has been prepared and characterized by IR spectroscopy and XPS spectra. The crystal structure of the complex has been determined by X-ray diffraction. The crystal belongs to Triclinic syst...The complex UO2(DDPEZ)(NO3)2 has been prepared and characterized by IR spectroscopy and XPS spectra. The crystal structure of the complex has been determined by X-ray diffraction. The crystal belongs to Triclinic system and space group P1, with cell parameters: a=0.664 2(3) nm, b=0.805 0(2) nm, c=1.515 6(5) nm, α=104.39(2)°, β=91.13(3)°, γ=94.84(3)°, and V=0.781 4(5) nm3, Z=2, Dc=1 676 kg·m-3, μ(Mo Kα)=0.071 073 nm, F(000)=390, final R=0.037 9 and wR=0.091 7 for observed reflections[I>2σ(I)]. The results indicated that uranyl ion is coordinated with six oxygen atoms, four of them from two nitrate groups and two from carbonyl groups of different organic ligands. CCDC: 284452.展开更多
The dependence of THMA extraction behaviour for U(VI) alld Th(IV) on nitric acid concentration, THMA concentration and molecular structure of extracted complex has been studied. For nitric acid solutions of 3.0mol/L a...The dependence of THMA extraction behaviour for U(VI) alld Th(IV) on nitric acid concentration, THMA concentration and molecular structure of extracted complex has been studied. For nitric acid solutions of 3.0mol/L a coordinative mechanism may possibly dominate in the extraction of metal cations. The complex composition of UO2(NO3)2(THMA)2,Th(NO3)4 (THMA)2 and Th(NO3)4 (THMA)3 are proved.展开更多
基金This work was supported by the National Natural Science Foundation of China and the funds of the Key Laboratory of Organic Syntheses of Jiansu Province
文摘The crystal structure of the title compound UO2(NO3)2[CH2(CH2)2CONC8H17] was determined by single-crystal X-ray diffraction. Crystal data: triclinic, space group P , a = 7.456(2), b = 8.371(2), c = 13.470(3) ? ?= 95.66(1), ?= 94.64(2), ?= 102.67(2), C24H46N4O10U, Mr = 788.68, V = 811.7(3) ?, Dc = 1.613 g/cm3, Z = 1, F(000) = 390, ?= 5.052 mm-1, the final R = 0.0256 and wR = 0.0568 for 2826 observed reflections (I > 2(I)). The central uranyl ions are coordinated by six oxygen atoms. Two of them are from the carbonyl groups of N-octyl-a-pyrrolidone molecules, and the other four from two nitrate groups.
文摘The extraction behavior of N,N-diethyl-N,N-dibenzenyl-urea（DEDBU）and N,N-dimethyl-N,N-dibenzenyl-urea（DMDBU）to uranium（VI）and thorium（IV）from nitric acid solution was studied by using xylene or chloroform as diluent.The effect of aqueous HNO3 concentration,extractant concentration,salting-out agent concentration and aqueous UO2+2/Th4+concentration on extraction distribution ratio of U（VI）and Th（IV）was determined.The results show that the extraction behavior of the extractants DEDBU and DMDBU to U（VI）is similar to that of TBP,the solvation numbers both are two.Under the experimental condition,the extractants DEDBU and DMDBU do not show the extraction behatvior to Th（IV）.This means that the estractants may have potential application to separate U（VI）and Th（IV）.
文摘The extraction of uranyl nitrate was studied with newly synthesized unsymmetrical alkylamides, N-methyl-N-octyloctylamide (MOOA), N-methyl-N-octyldecanamide (MODA), and N-methyl-N-octyldodecanamide (MODOA), employing n-octane as diluent. The effect of the concentrations of nitric acid, sodium nitrate and extractants on the extraction was investigated and the extraction mechanism was suggested. The effect of temperature on the extraction was also studied and the related thermodynamic functions were calculated. The extracted species were characterized by FTIR spectrometry.
文摘The novel unsymmetrical extractant N,N′-dimethyl-N,N′-dioctylmalonamide (DMDOMA) was prepared by reaction of diethyl malonate with N-methyl octanamine. The extraction mechanism and the behavior of uranyl nitrate with DMDOMA employed cyclohexane as diluent were studied. The effects of concentrations of nitric acid, sodium nitrate, extractant and also the temperature on the extraction were considered. The stoichiometry of the extracted species is and the coordination of extracted species was suggested based on the IR data. The value of ΔH of extraction is -26.9 ± 0.80 kJ·mol-1. The value of the apparent extraction constant is 133.88 ± 17.92, which shows that the optimization of extractant structure improves the extractability of malonamide for uranyl nitrate.
文摘The complex UO2(DDPEZ)(NO3)2 has been prepared and characterized by IR spectroscopy and XPS spectra. The crystal structure of the complex has been determined by X-ray diffraction. The crystal belongs to Triclinic system and space group P1, with cell parameters: a=0.664 2(3) nm, b=0.805 0(2) nm, c=1.515 6(5) nm, α=104.39(2)°, β=91.13(3)°, γ=94.84(3)°, and V=0.781 4(5) nm3, Z=2, Dc=1 676 kg·m-3, μ(Mo Kα)=0.071 073 nm, F(000)=390, final R=0.037 9 and wR=0.091 7 for observed reflections[I>2σ(I)]. The results indicated that uranyl ion is coordinated with six oxygen atoms, four of them from two nitrate groups and two from carbonyl groups of different organic ligands. CCDC: 284452.
文摘The dependence of THMA extraction behaviour for U(VI) alld Th(IV) on nitric acid concentration, THMA concentration and molecular structure of extracted complex has been studied. For nitric acid solutions of 3.0mol/L a coordinative mechanism may possibly dominate in the extraction of metal cations. The complex composition of UO2(NO3)2(THMA)2,Th(NO3)4 (THMA)2 and Th(NO3)4 (THMA)3 are proved.
