组氨酸与锌(Ⅱ)配合物标准生成焓的溶解量热法测定  

Determination of Standard Formation Enthalpy for Complexes of Histidinc with Zinc (Ⅱ) by Solution Calorimetry

作　　者：屈景年[1] 罗炳初[1] 刘金春 莫运春[1] 

机构地区：[1]衡阳师范学院化学与材料科学系,湖南衡阳421008 [2]湖南建材专科学校,湖南衡阳421001

出　　处：《衡阳师范学院学报》2002年第6期63-65,共3页Journal of Hengyang Normal University

基　　金：衡阳师范学院科研基金

摘　　要：合成了组氨酸锌(Ⅱ)配合物Zn(His)SO_4·H_2O(s),用溶解量热法测定了反应物和产物在298.2k条件下分别溶解在2mol/LH_2SO_4溶液中的溶解焓,根据Hess定律和所设计的热化学循环计算出配合反应焓变△_rH_m~θ=9.371±0.073kJ.mol^(-1),进而求出配合物Zn(His)SO_4·H_2O(s)的标准生成焓△_fH_m~θ=[Zn(His)SO_4·H_2O(s)]=-1788.72±1.560kJ.mol^(-1)。in this paper a complexes of His and Zn2+ was synthesized. By solution calorimetry. the dissolution enthalpy was determined for the complexes and the reactant, dissolved in 2mol/L H2SO4 solution at 298.2k. In accordance with Hess's law, by making design of a thermochmistry cycle, we obtained the coordination reaction enthalpy. △RHinθ= 9.371 ± 0.073kJ. mol-1 , and the standard formation enthalpy of complexes, △fHmθ [Zn ( His) SO4 · H2O (s)] = - 1788. 721 ±1.560kJ. mol-1

关 键 词：组氨酸 锌配合物 溶解量热法 标准生成焓 测定方法 燃烧能 

分 类 号：O614.241[理学—无机化学] O64[理学—化学]