Preparation and Thermal Chemical Property of Complexes of Zinc Nitrate with Trytophan  

作　　者：陈三平 高胜利 杨旭武 史启祯 

机构地区：[1]Department of Chemistry, Shaanxi Key Laboratory of Physico Inorganic Chemistry, Northwest University, Xi'an, Shaanxi 710069, China

出　　处：《Chinese Journal of Chemistry》2003年第6期638-643,共6页中国化学（英文版）

基　　金：ProjectedsupportedbytheNationalNaturalScienceFoundation (Nos .2 998710 3 2and 2 0 1710 3 6)ofChina .

摘　　要：The solubility property of Zn(NO 3) 2 Try H 2O system at 25 ℃ in whole concentration range has been investigated by the semi micro phase equilibrium method. The corresponding phase diagrams and refractive index diagrams were constructed. Under the guidance of the phase equilibrium results, the incongruently soluble compounds of Zn(Try)(NO 3) 2·2H 2O (F) and Zn^(Try) 2(NO 3) 2·H 2O (G), which have not been reported previously, were synthesized and characterized by IR, XRD, TG DTG, as well as chemical and elemental analyses. The constant volume combustion energies of the compounds, Δ c E , determined by a precision rotating bomb calorimeter at 298 15 K, were (-13518 98±4 99) J·g -1 and (-17690 85±4 88) J·g -1 , respectively. The standard enthalpies of combustion for these compounds, Δ c H , were calculated to be (-5802 36±2 14) kJ· mol -1 and (-10891 59±3 01) kJ·mol -1 when the standard enthalpies of formation, Δ f H m were (-1161 18±2 61) kJ·mol -1 and (-1829 71±4 20) kJ·mol -1 . The enthalpies of solution in condition of simulating human gastric juice (37 ℃, pH=1, the solution of hydrochloric acid), which were also measured by a microcalorimeter, were (14 55±0 04) kJ·mol -1 and (10 58±0 06) kJ·mol -1 , respectively.The solubility property of Zn(NO 3) 2 Try H 2O system at 25 ℃ in whole concentration range has been investigated by the semi micro phase equilibrium method. The corresponding phase diagrams and refractive index diagrams were constructed. Under the guidance of the phase equilibrium results, the incongruently soluble compounds of Zn(Try)(NO 3) 2·2H 2O (F) and Zn^(Try) 2(NO 3) 2·H 2O (G), which have not been reported previously, were synthesized and characterized by IR, XRD, TG DTG, as well as chemical and elemental analyses. The constant volume combustion energies of the compounds, Δ c E , determined by a precision rotating bomb calorimeter at 298 15 K, were (-13518 98±4 99) J·g -1 and (-17690 85±4 88) J·g -1 , respectively. The standard enthalpies of combustion for these compounds, Δ c H , were calculated to be (-5802 36±2 14) kJ· mol -1 and (-10891 59±3 01) kJ·mol -1 when the standard enthalpies of formation, Δ f H m were (-1161 18±2 61) kJ·mol -1 and (-1829 71±4 20) kJ·mol -1 . The enthalpies of solution in condition of simulating human gastric juice (37 ℃, pH=1, the solution of hydrochloric acid), which were also measured by a microcalorimeter, were (14 55±0 04) kJ·mol -1 and (10 58±0 06) kJ·mol -1 , respectively.

关 键 词：ternary system zinc nitrate trytophan characterization standard enthalpy of formation 

分 类 号：O642[理学—物理化学]