The complexes with the general formula REP3A· H2O [P = 2- (COO ) C6H4CONHC6H4X, X=2-CI, 4-Br; A=Gly, Ala, Leu; RE=Pr3+, Nd3+] were synthesized and characlerized by elemental analysis, IR and reflectance electroni...The complexes with the general formula REP3A· H2O [P = 2- (COO ) C6H4CONHC6H4X, X=2-CI, 4-Br; A=Gly, Ala, Leu; RE=Pr3+, Nd3+] were synthesized and characlerized by elemental analysis, IR and reflectance electronic spectra and TG methods. The results show that rare earth ion in each complex is coordinated by three oxygen atoms. One is from the amido and the other two from the hydroxyl in the carboxylate and the amino acid respectively, and each complex contains one coordinate water molecule. Condon parameters Fk, Lande parameters(4f), Nephelanxetic ratio(β), percentage convalency parameter(δ) and bonding parameter(b ) of the chelates were calculated from the reflectance electronic spectra, indicating certain covalent character in the metalligand bond. The apparent decompose activation energies were evaluated and the decompose mechanism were discussed.展开更多
The stability constants and thermodynamic functions for complexes of lanthanum with eight kind of amino acids according to 1 : 1 and 1 : 2 in proportion have been determined by titration calorimeter at 298. 15 K. The ...The stability constants and thermodynamic functions for complexes of lanthanum with eight kind of amino acids according to 1 : 1 and 1 : 2 in proportion have been determined by titration calorimeter at 298. 15 K. The enthalpy change makes a predominant contribution to the stability of these complexes. The ring in amino acid associated with lanthanum ion helps to enhance the stability of complexes. Steric effects between rings in complexes leads to that the equilibrium constants of reaction of the complexes (1 : 2) is much less than that of the complexes (1 : 1).展开更多
The effects of La(NO3)3 on the liquid culture and the contents of amino acids of Nostoc commune flagelliforme cells were studied. It is indicated from the experimental results that the growth of Nostoc commune flagell...The effects of La(NO3)3 on the liquid culture and the contents of amino acids of Nostoc commune flagelliforme cells were studied. It is indicated from the experimental results that the growth of Nostoc commune flagelliformecells can be stimulated by La(NO3)3 at the concentrations from 1 to 200 mg·L-1, and among them the treatment of 100mg·L-1 La(NO3)3 has the largest A670 and dry weight which increased by 64. 9% and 61. 1 %, respectively as compared with the control, and La(NO3)3 can also influence the contents of some kinds of amino acids in Nostoc communeflagelliforme cells. The contents of aspartic acid and glutamic acid decreased by 59. 9% and 57. 9%, respectively, andthat of proline increased by 24. 5% with the treatment of 200 mg·L-1 La(NO3)3.展开更多
Forty-three phase diagrams of ternary system concerning rare earth salts, α-amino acids and water, which were constructed by phase equilibrium methods, were expounded. The influences of the factors such as cations, a...Forty-three phase diagrams of ternary system concerning rare earth salts, α-amino acids and water, which were constructed by phase equilibrium methods, were expounded. The influences of the factors such as cations, anions, the structure of amino acids, temperature on the phase diagrams were discussed. Under the guidance of phase equilibrium results, over 150 new solid complexes were prepared. IR, reflecting, UV, FS, and Raman spectra for these complexes were investigated and the regularity of “tripartite effect”, “tetrad effect”, “Nephelanxetic effect”, “Oddo-Harkins” was observed. Thermal decomposition processes of the complexes were confirmed. Based on the comparison with the known crystal structures of rare earth-amino acid-complexes, an estimation method for predicting the crystal structure data of series complexes was founded. The constant volume combustion energies of the complexes were determined by RBC-1 type rotating bomb calorimeter. The standard enthalpies of combustion and standard enthalpies of formation were calculated for these complexes.展开更多
Six new complexes of lanthanum with amino acid Schiff base ligands, A-F, were prepared in methanol-aqueous solution. The composition and properties of the title complexes were characterized by elemental analysis, mola...Six new complexes of lanthanum with amino acid Schiff base ligands, A-F, were prepared in methanol-aqueous solution. The composition and properties of the title complexes were characterized by elemental analysis, molar conductance, infrared, electronic spectra, 1H NMR, thermogravimetric and differential thermal analysis.展开更多
Ten new rare earth solid complexes were synthesized by the reaction of sodium 5-aminosalicyliate with rare earth chloride. The structure character, physical and chemical properties of these complexes were studied by I...Ten new rare earth solid complexes were synthesized by the reaction of sodium 5-aminosalicyliate with rare earth chloride. The structure character, physical and chemical properties of these complexes were studied by IR, UV, （）1H NMR spectra, TG-DTA, fluorescence, elemental analyses, molar conductance and magnetic susceptibility. The ten rare earth complexes exist in dimeric form probably and the coordination number is seven. The antibacterial activity of the ligand and six complexes was also tested against Staphylococcus aureus, Escherichia coli and Bacillus subtilis, and the effect of Yb complex at 20 mg·ml-1 against Staphylococcus aureus is most significant.展开更多
The adsorption behavior and mechanism of a novel chelate resin, amino methylene phosphonic acid resin （APAR） for Ho（Ⅲ） were investigated. The statically saturated adsorption capacity is 258 mg·g-1 resin at 2...The adsorption behavior and mechanism of a novel chelate resin, amino methylene phosphonic acid resin （APAR） for Ho（Ⅲ） were investigated. The statically saturated adsorption capacity is 258 mg·g-1 resin at 298 K in HAc-NaAc medium. The Ho（Ⅲ） adsorbed on APAR can be repeatedly eluted by 3.0 mol·L-1 HCl and the elution percentage is as high as 95.8%. The resin can be regenerated and reused without apparent decrease in adsorption capacity. The apparent adsorption rate constant is k298=1.14×10-5 s-1. The adsorption behavior of APAR for Ho（Ⅲ） obeys the Freundlich isotherm. The thermodynamic adsorption parameter, enthalpy change ΔH of APAR for Ho（Ⅲ） is 11.4 kJ·mol-1. The apparent activation energy is Ea=15.8 kJ·mol-1. The molar coordination ratio of the functional group of APAR to Ho（Ⅲ） is about 2∶1. The adsorption mechanism of APAR for Ho（Ⅲ） was examined by using chemical method and IR spectrometry.展开更多
基金The Fund for Tobacco Science Studies and Gechnical Development, Tobaceo Bureau of hina !19980655
文摘The complexes with the general formula REP3A· H2O [P = 2- (COO ) C6H4CONHC6H4X, X=2-CI, 4-Br; A=Gly, Ala, Leu; RE=Pr3+, Nd3+] were synthesized and characlerized by elemental analysis, IR and reflectance electronic spectra and TG methods. The results show that rare earth ion in each complex is coordinated by three oxygen atoms. One is from the amido and the other two from the hydroxyl in the carboxylate and the amino acid respectively, and each complex contains one coordinate water molecule. Condon parameters Fk, Lande parameters(4f), Nephelanxetic ratio(β), percentage convalency parameter(δ) and bonding parameter(b ) of the chelates were calculated from the reflectance electronic spectra, indicating certain covalent character in the metalligand bond. The apparent decompose activation energies were evaluated and the decompose mechanism were discussed.
基金Supported by the National Nature Science Foundation of China(29873036)
文摘The stability constants and thermodynamic functions for complexes of lanthanum with eight kind of amino acids according to 1 : 1 and 1 : 2 in proportion have been determined by titration calorimeter at 298. 15 K. The enthalpy change makes a predominant contribution to the stability of these complexes. The ring in amino acid associated with lanthanum ion helps to enhance the stability of complexes. Steric effects between rings in complexes leads to that the equilibrium constants of reaction of the complexes (1 : 2) is much less than that of the complexes (1 : 1).
文摘The effects of La(NO3)3 on the liquid culture and the contents of amino acids of Nostoc commune flagelliforme cells were studied. It is indicated from the experimental results that the growth of Nostoc commune flagelliformecells can be stimulated by La(NO3)3 at the concentrations from 1 to 200 mg·L-1, and among them the treatment of 100mg·L-1 La(NO3)3 has the largest A670 and dry weight which increased by 64. 9% and 61. 1 %, respectively as compared with the control, and La(NO3)3 can also influence the contents of some kinds of amino acids in Nostoc communeflagelliforme cells. The contents of aspartic acid and glutamic acid decreased by 59. 9% and 57. 9%, respectively, andthat of proline increased by 24. 5% with the treatment of 200 mg·L-1 La(NO3)3.
基金the National Natural Science Foundation of China，山西省自然科学基金
文摘Forty-three phase diagrams of ternary system concerning rare earth salts, α-amino acids and water, which were constructed by phase equilibrium methods, were expounded. The influences of the factors such as cations, anions, the structure of amino acids, temperature on the phase diagrams were discussed. Under the guidance of phase equilibrium results, over 150 new solid complexes were prepared. IR, reflecting, UV, FS, and Raman spectra for these complexes were investigated and the regularity of “tripartite effect”, “tetrad effect”, “Nephelanxetic effect”, “Oddo-Harkins” was observed. Thermal decomposition processes of the complexes were confirmed. Based on the comparison with the known crystal structures of rare earth-amino acid-complexes, an estimation method for predicting the crystal structure data of series complexes was founded. The constant volume combustion energies of the complexes were determined by RBC-1 type rotating bomb calorimeter. The standard enthalpies of combustion and standard enthalpies of formation were calculated for these complexes.
文摘Six new complexes of lanthanum with amino acid Schiff base ligands, A-F, were prepared in methanol-aqueous solution. The composition and properties of the title complexes were characterized by elemental analysis, molar conductance, infrared, electronic spectra, 1H NMR, thermogravimetric and differential thermal analysis.
文摘Ten new rare earth solid complexes were synthesized by the reaction of sodium 5-aminosalicyliate with rare earth chloride. The structure character, physical and chemical properties of these complexes were studied by IR, UV, （）1H NMR spectra, TG-DTA, fluorescence, elemental analyses, molar conductance and magnetic susceptibility. The ten rare earth complexes exist in dimeric form probably and the coordination number is seven. The antibacterial activity of the ligand and six complexes was also tested against Staphylococcus aureus, Escherichia coli and Bacillus subtilis, and the effect of Yb complex at 20 mg·ml-1 against Staphylococcus aureus is most significant.
文摘The adsorption behavior and mechanism of a novel chelate resin, amino methylene phosphonic acid resin （APAR） for Ho（Ⅲ） were investigated. The statically saturated adsorption capacity is 258 mg·g-1 resin at 298 K in HAc-NaAc medium. The Ho（Ⅲ） adsorbed on APAR can be repeatedly eluted by 3.0 mol·L-1 HCl and the elution percentage is as high as 95.8%. The resin can be regenerated and reused without apparent decrease in adsorption capacity. The apparent adsorption rate constant is k298=1.14×10-5 s-1. The adsorption behavior of APAR for Ho（Ⅲ） obeys the Freundlich isotherm. The thermodynamic adsorption parameter, enthalpy change ΔH of APAR for Ho（Ⅲ） is 11.4 kJ·mol-1. The apparent activation energy is Ea=15.8 kJ·mol-1. The molar coordination ratio of the functional group of APAR to Ho（Ⅲ） is about 2∶1. The adsorption mechanism of APAR for Ho（Ⅲ） was examined by using chemical method and IR spectrometry.
