The complexes of zinc chloride and zinc nitrate with 2 amino 4,6 dimethyl pyrimidine (ADMP) were prepared through reflux in alcohol. The compositions of the complexes Zn(ADMP)2Cl2 (b) and Zn(ADMP)2(NO3)2·4H2O (c)...The complexes of zinc chloride and zinc nitrate with 2 amino 4,6 dimethyl pyrimidine (ADMP) were prepared through reflux in alcohol. The compositions of the complexes Zn(ADMP)2Cl2 (b) and Zn(ADMP)2(NO3)2·4H2O (c) were determined by chemical and elemental analyses. The complexes were characterized by IR, XPS, 1H NMR and TG DTG techniques. The constant volume combustion energies of ADMP and the complexes, ΔcE, were determined by a precise rotating bomb calorimeter at 298.15K. They were (-3664.53±1.18)kJ·mol-1, (-7130.94±3.69)kJ·mol-1, and (-7637.87±5.71)kJ·mol-1. Their standard enthalpies of combustion,, and standard enthalpies of formation, , were calculated. They were (-3666.39±1.18)kJ·mol-1, (-7129.70±3.69)kJ·mol-1, (-7632.91 ±5.71)kJ·mol-1 and (19.09±1.43)kJ·mol-1, (-411.96±4.03)kJ·mol-1, (-1153.28±6.02)kJ·mol-1.展开更多
The thermokinetics of liquid-liqui d reaction of samarium nitrate /dysp rosium nitrate /erbium nitrate with histidine are studied using a microcalorimeter.On the basis of experime ntal and calculated results,three t h...The thermokinetics of liquid-liqui d reaction of samarium nitrate /dysp rosium nitrate /erbium nitrate with histidine are studied using a microcalorimeter.On the basis of experime ntal and calculated results,three t hermo-dynamic parameters(the activation enthalpy,the active entropy and the activation free energy),the rate constant,three kinetic parameters(the activation energy,the pre-exponential constant and the reaction order)are obtained.The influence of temperature on the t itled reaction and the synthetic con dition of the complex have been discu ssed.展开更多
The solid complex of zinc L threonate has been prepared from the reaction mixture of L ascorbic acid, calcium carbonate and hydrogen peroxide in water at 0～3 ℃. It is purified by methyl alcohol extraction under redu...The solid complex of zinc L threonate has been prepared from the reaction mixture of L ascorbic acid, calcium carbonate and hydrogen peroxide in water at 0～3 ℃. It is purified by methyl alcohol extraction under reduced pressure. The composition of the complex is determined by chemical and elemental analyses and its formula fits Zn(C 4H 7O 5) 2. The purity of the complex is 99 60% by HPLC. The IR spectra indicate that Zn 2+ in the complex coordinates to oxygen atom of the carbonyl group and oxygen atom of the carboxyl group, while the proton of the carboxyl group is dissociated. It is assumed that the coordination number of Zn 2+ is 4. The TG DTG results show that the intermediate and final products of the thermal decomposition of the complex are Zn(CH 3COO) 2 and ZnO, respectively.展开更多
文摘The complexes of zinc chloride and zinc nitrate with 2 amino 4,6 dimethyl pyrimidine (ADMP) were prepared through reflux in alcohol. The compositions of the complexes Zn(ADMP)2Cl2 (b) and Zn(ADMP)2(NO3)2·4H2O (c) were determined by chemical and elemental analyses. The complexes were characterized by IR, XPS, 1H NMR and TG DTG techniques. The constant volume combustion energies of ADMP and the complexes, ΔcE, were determined by a precise rotating bomb calorimeter at 298.15K. They were (-3664.53±1.18)kJ·mol-1, (-7130.94±3.69)kJ·mol-1, and (-7637.87±5.71)kJ·mol-1. Their standard enthalpies of combustion,, and standard enthalpies of formation, , were calculated. They were (-3666.39±1.18)kJ·mol-1, (-7129.70±3.69)kJ·mol-1, (-7632.91 ±5.71)kJ·mol-1 and (19.09±1.43)kJ·mol-1, (-411.96±4.03)kJ·mol-1, (-1153.28±6.02)kJ·mol-1.
文摘The thermokinetics of liquid-liqui d reaction of samarium nitrate /dysp rosium nitrate /erbium nitrate with histidine are studied using a microcalorimeter.On the basis of experime ntal and calculated results,three t hermo-dynamic parameters(the activation enthalpy,the active entropy and the activation free energy),the rate constant,three kinetic parameters(the activation energy,the pre-exponential constant and the reaction order)are obtained.The influence of temperature on the t itled reaction and the synthetic con dition of the complex have been discu ssed.
文摘The solid complex of zinc L threonate has been prepared from the reaction mixture of L ascorbic acid, calcium carbonate and hydrogen peroxide in water at 0～3 ℃. It is purified by methyl alcohol extraction under reduced pressure. The composition of the complex is determined by chemical and elemental analyses and its formula fits Zn(C 4H 7O 5) 2. The purity of the complex is 99 60% by HPLC. The IR spectra indicate that Zn 2+ in the complex coordinates to oxygen atom of the carbonyl group and oxygen atom of the carboxyl group, while the proton of the carboxyl group is dissociated. It is assumed that the coordination number of Zn 2+ is 4. The TG DTG results show that the intermediate and final products of the thermal decomposition of the complex are Zn(CH 3COO) 2 and ZnO, respectively.
