A complex of terbium(Ⅲ) with Schiff base salicylaldehyde-taurine and 1,10-phenanthroline was synthesized. The molecular formula was [Tb (sal-taurine) (1,10-phen) (NO_3)]·2H_2O (sal=salicylaldehyde, 1,10-phen=1,1...A complex of terbium(Ⅲ) with Schiff base salicylaldehyde-taurine and 1,10-phenanthroline was synthesized. The molecular formula was [Tb (sal-taurine) (1,10-phen) (NO_3)]·2H_2O (sal=salicylaldehyde, 1,10-phen=1,10-phenanthroline). The composition of the title complex was determined by elemental analysis and EDTA volumetic analysis. IR, Molar conductivity and X-ray powder diffraction were performed for its characterizations. The thermal decomposition kinetics of the complex were investigated under non-isothermal condition using the Achar differential method and the Coats-Redfern integral method. The kinetic equation for the second step corresponds to the mechanisms of the Zhuralev, Lesokin and Templman equation were obtained.展开更多
In this paper, uising the thermo-decomposition quantitative method to determine the alite content in cement clinker has been studied. It is shown that the alite content determined by the thermo-decomposition method is...In this paper, uising the thermo-decomposition quantitative method to determine the alite content in cement clinker has been studied. It is shown that the alite content determined by the thermo-decomposition method is very close to that obtained by the optical microscopy method. The practical quantitative analysis of alite in cement clinker was carried out by the thermo-decomposition method and a quite satisfactory result has been obtained.展开更多
Four solid complexes of Ln(Me2dtc)3(phen) (Ln=La, Pr, Nd, Sm) were synthesized in anhydrous ethanol by the reaction of lanthanide chloride low hydrate with the mixed ligand of sodium dimethyldithiocarbamate and 1, 10-...Four solid complexes of Ln(Me2dtc)3(phen) (Ln=La, Pr, Nd, Sm) were synthesized in anhydrous ethanol by the reaction of lanthanide chloride low hydrate with the mixed ligand of sodium dimethyldithiocarbamate and 1, 10-phenanthroline·H2O (phen·H2O), and characterized by elemental analysis, IR spectroscopy, TG-DTG, and X-ray diffraction analysis. TG-DTG with X-ray powder diffraction showed that these compounds could decompose to lanthanide sulfides at relatively lower temperature, which indicated that the title complexes could be favorable precursors to prepare lanthanide sulfides.展开更多
he present paper covers the synthesis,crystal structure and thermodecom-position kinetics of bis [(3-methoxysalicylal )-ethanolamine] copper (Ⅱ) complex.X-ray diffraction determination gave the following crystal data...he present paper covers the synthesis,crystal structure and thermodecom-position kinetics of bis [(3-methoxysalicylal )-ethanolamine] copper (Ⅱ) complex.X-ray diffraction determination gave the following crystal data: triclinic system.space group P1,Z=2.a = 0. 884 1 ( 4 ) .b =1.0773 (2), c = 1 . 1 32 1 (3) nm . α=70. 38(1),β= 70.70(2).γ=78.29 ( 2)°.The final agreement factors were R =0. 075, R_w= 0. 067, respectively.Investigation on non-isothermal kinetics of thecomplex favored second order kinetics. The kinetic equation is expressed as: da/dt= A × e ￣(-E/RT)×(1 -α)￣2 .展开更多
文摘A complex of terbium(Ⅲ) with Schiff base salicylaldehyde-taurine and 1,10-phenanthroline was synthesized. The molecular formula was [Tb (sal-taurine) (1,10-phen) (NO_3)]·2H_2O (sal=salicylaldehyde, 1,10-phen=1,10-phenanthroline). The composition of the title complex was determined by elemental analysis and EDTA volumetic analysis. IR, Molar conductivity and X-ray powder diffraction were performed for its characterizations. The thermal decomposition kinetics of the complex were investigated under non-isothermal condition using the Achar differential method and the Coats-Redfern integral method. The kinetic equation for the second step corresponds to the mechanisms of the Zhuralev, Lesokin and Templman equation were obtained.
文摘In this paper, uising the thermo-decomposition quantitative method to determine the alite content in cement clinker has been studied. It is shown that the alite content determined by the thermo-decomposition method is very close to that obtained by the optical microscopy method. The practical quantitative analysis of alite in cement clinker was carried out by the thermo-decomposition method and a quite satisfactory result has been obtained.
基金Project supported by the National Natural Science Fundation of China (20471047 20771089)the National NaturalScience Fundation of Shaanxi Province (2007B02)
文摘Four solid complexes of Ln(Me2dtc)3(phen) (Ln=La, Pr, Nd, Sm) were synthesized in anhydrous ethanol by the reaction of lanthanide chloride low hydrate with the mixed ligand of sodium dimethyldithiocarbamate and 1, 10-phenanthroline·H2O (phen·H2O), and characterized by elemental analysis, IR spectroscopy, TG-DTG, and X-ray diffraction analysis. TG-DTG with X-ray powder diffraction showed that these compounds could decompose to lanthanide sulfides at relatively lower temperature, which indicated that the title complexes could be favorable precursors to prepare lanthanide sulfides.
文摘he present paper covers the synthesis,crystal structure and thermodecom-position kinetics of bis [(3-methoxysalicylal )-ethanolamine] copper (Ⅱ) complex.X-ray diffraction determination gave the following crystal data: triclinic system.space group P1,Z=2.a = 0. 884 1 ( 4 ) .b =1.0773 (2), c = 1 . 1 32 1 (3) nm . α=70. 38(1),β= 70.70(2).γ=78.29 ( 2)°.The final agreement factors were R =0. 075, R_w= 0. 067, respectively.Investigation on non-isothermal kinetics of thecomplex favored second order kinetics. The kinetic equation is expressed as: da/dt= A × e ￣(-E/RT)×(1 -α)￣2 .
