高氯酸钐与甘氨酸配位反应的热化学研究

Thermochemical Study of the Reaction of Samarium Perchlorate Coordinated with Glycine

合成了稀土高氯酸钐 -甘氨酸配合物晶体 .经热重、差热、化学分析及对比有关文献 ,知其组成是 [Sm2 (Gly) 6(H2 O) 4](ClO4 ) 6·5H2 O ,单晶结构 ,纯度 99 0 % .选用SmCl3·6H2 O、Gly、NaClO4 ·H2 O、NaCl和H2 O作辅助物 ,采用具有恒温环境的反应热量计 ,以 2mol·L-1HCl作溶剂 ,分别测定了 [2SmCl3·6H2 O +6Gly+6NaClO4 ·H2 O]和 [[Sm2 (Gly) 6(H2 O) 4](ClO4 ) 6·5H2 O +6NaCl+9H2 O]在 2 98 1 5K时的溶解焓 .设计一热化学循环求得化学反应的反应焓△rH0—m =- 56.684kJ·mol-1,计算得配合物 [Sm2 (Gly) 6(H2 O) 4) ](ClO4 ) 6·5H2 O(S)在 2 98 1 5K时的标准生成焓△fH0—m ,2 98 15K =- 7993.1 54kJ·mol-1.

Rare-earth perchlorate complex compound with glycine [Sm 2(Gly) 6(H 2O) 4](ClO 4) 6·5H 2O was synthesized and obtained in the form of monocrystals.By using TG,DTA and chemical analytic Method,and comparing with relative literatures,its monocrystal structure was characterized,and it has a purification of 99.0%.A thermochemical cycle was designed at 298.15K,the chemical reaction and standard enthalpy of formation were measured by solution calorimetry,the solution calorimetry of the reactants[2SmCl 3·6H 2O+6Gly+6NaClO 4·H 2O]and the products[[Sm 2(Gly) 6(H 2O) 4](ClO 4) 6·5H 2O+6NaCl+9H 2O]were carried out in an isoperibel reaction calorimeter,respectively.The calormetric solvent was 2 mol·L -1 HCl.According to the results,the following date were obtained:△ rH 0? =-56.684 J,△ fH 0? ([Sm 2(Gly) 6(H 2O) 4](ClO 4) 6·5H 2O,s,298.15K)=-799 3.154kJ/mol.