Chirai sodium zincophosphate nanocrystalline has been prepared and characterized. The standard molar enthaipy of the following reaction 12Na3PO4·12H2O（s）＋ 12ZnSO4·7H2O（s）= Na12（Zn12P12O48）·12H2O...Chirai sodium zincophosphate nanocrystalline has been prepared and characterized. The standard molar enthaipy of the following reaction 12Na3PO4·12H2O（s）＋ 12ZnSO4·7H2O（s）= Na12（Zn12P12O48）·12H2O（s）＋ 12Na2SO4（s）＋216H2O（1） was determined by solution reaction calorimetric at 298.15 K, and calculated to be 33.666±0.195 kl/mol. From the results and other auxiliary quantities, the standard enthalpy of formation for sodium zincophosphate nanocrystalline was derived to be △fHm^⊙ [Na12（Zn12P12O48）·12H2O（s）, 298.15 K] =- 24268.494 ± 0.815 kJ/mol.展开更多
The dissolution enthalpy of the reactans and the products was determined by solution calorimetry.The calorimetric solvent is 2mol·L -1 HCl solution.A thermochemistry cycle was designed to obtain the enthalpy of c...The dissolution enthalpy of the reactans and the products was determined by solution calorimetry.The calorimetric solvent is 2mol·L -1 HCl solution.A thermochemistry cycle was designed to obtain the enthalpy of coordination reaction,Δ rH m=-479.321kJ·mol -1 ,and the standardmolar enthalpy of formation of the new complex La(Tyr)(Gly) 3Cl 3·3H 2O(s) was calculated,Δ fH m[La(Tyr)(Gly) 3Cl 3·3H 2O,s298.2K]=-4695.266kJ·mol -1 .展开更多
A formulated as △fH m ? (PPDs,g)=a+ΣbiPi + cifi is put forward for estimating standard formation enthalpies of pyridine-derivatives (PDDs), in which,P i is path index andc i f i is an amended term of interac...A formulated as △fH m ? (PPDs,g)=a+ΣbiPi + cifi is put forward for estimating standard formation enthalpies of pyridine-derivatives (PDDs), in which,P i is path index andc i f i is an amended term of interaction between substituent and N atom on pyridine ring. The Calculations based on the model were carried out for some pyridine-derivatives. The values of standard formation enthalpy calculated are consistent with those in literature.展开更多
A complex Na2[Zn（Cys）2]·5H2O was synthesized and the composition of the complex was determined by chemical and thermogravimatric and infrared analysis. The molar dissolution enthalpy of the reactants and produc...A complex Na2[Zn（Cys）2]·5H2O was synthesized and the composition of the complex was determined by chemical and thermogravimatric and infrared analysis. The molar dissolution enthalpy of the reactants and products were measured by classical solution calorimetry, the calorimetric solvent is 4 mol·L-1HCl,at 298.2 K. Using a thermochemistry cycle, the standard molar formation enthalpy of complex Na2[Zn（Cys）2]·5H2O has been calculated to be △fHmNa2[Zn（Cys）2]·5H2O（s）=-2828.323 kJ·mol-1.The result supplies a basic thermochemistry parameter for the further research of the complex.展开更多
The complex of ZnCl2 with DL-alanine,Zn（Ala）2Cl2·1/2H2O,was synthesized and characterized by IR,thermogravimatric analysis and chemical analysis.The molar dissolution enthalpies of the reactants and the product...The complex of ZnCl2 with DL-alanine,Zn（Ala）2Cl2·1/2H2O,was synthesized and characterized by IR,thermogravimatric analysis and chemical analysis.The molar dissolution enthalpies of the reactants and the product were determined in H2O by classical solution calorimetry.By designing a themochemical cycle,the reaction enthalpy of zinc chloride with DL-alanine,ΔrH○-m（298.15k）=-38.95kJ.mol-1,and the standard formation enthalpy of Zn（Ala）2Cl2·1/2H2O,ΔfHθm[Zn（Ala）2Cl2·1/2H2O,s,298.15k]=-1347.32kJ.mol-1,were calculated.展开更多
文摘Chirai sodium zincophosphate nanocrystalline has been prepared and characterized. The standard molar enthaipy of the following reaction 12Na3PO4·12H2O（s）＋ 12ZnSO4·7H2O（s）= Na12（Zn12P12O48）·12H2O（s）＋ 12Na2SO4（s）＋216H2O（1） was determined by solution reaction calorimetric at 298.15 K, and calculated to be 33.666±0.195 kl/mol. From the results and other auxiliary quantities, the standard enthalpy of formation for sodium zincophosphate nanocrystalline was derived to be △fHm^⊙ [Na12（Zn12P12O48）·12H2O（s）, 298.15 K] =- 24268.494 ± 0.815 kJ/mol.
文摘The dissolution enthalpy of the reactans and the products was determined by solution calorimetry.The calorimetric solvent is 2mol·L -1 HCl solution.A thermochemistry cycle was designed to obtain the enthalpy of coordination reaction,Δ rH m=-479.321kJ·mol -1 ,and the standardmolar enthalpy of formation of the new complex La(Tyr)(Gly) 3Cl 3·3H 2O(s) was calculated,Δ fH m[La(Tyr)(Gly) 3Cl 3·3H 2O,s298.2K]=-4695.266kJ·mol -1 .
基金Supported by the National Natural Science Foundation of China!(29971024)
文摘A formulated as △fH m ? (PPDs,g)=a+ΣbiPi + cifi is put forward for estimating standard formation enthalpies of pyridine-derivatives (PDDs), in which,P i is path index andc i f i is an amended term of interaction between substituent and N atom on pyridine ring. The Calculations based on the model were carried out for some pyridine-derivatives. The values of standard formation enthalpy calculated are consistent with those in literature.
文摘A complex Na2[Zn（Cys）2]·5H2O was synthesized and the composition of the complex was determined by chemical and thermogravimatric and infrared analysis. The molar dissolution enthalpy of the reactants and products were measured by classical solution calorimetry, the calorimetric solvent is 4 mol·L-1HCl,at 298.2 K. Using a thermochemistry cycle, the standard molar formation enthalpy of complex Na2[Zn（Cys）2]·5H2O has been calculated to be △fHmNa2[Zn（Cys）2]·5H2O（s）=-2828.323 kJ·mol-1.The result supplies a basic thermochemistry parameter for the further research of the complex.
文摘The complex of ZnCl2 with DL-alanine,Zn（Ala）2Cl2·1/2H2O,was synthesized and characterized by IR,thermogravimatric analysis and chemical analysis.The molar dissolution enthalpies of the reactants and the product were determined in H2O by classical solution calorimetry.By designing a themochemical cycle,the reaction enthalpy of zinc chloride with DL-alanine,ΔrH○-m（298.15k）=-38.95kJ.mol-1,and the standard formation enthalpy of Zn（Ala）2Cl2·1/2H2O,ΔfHθm[Zn（Ala）2Cl2·1/2H2O,s,298.15k]=-1347.32kJ.mol-1,were calculated.
