摘要
合成了稀土高氯酸铕 -谷氨酸配合物晶体。经热重、差热、化学分析及对比有关文献 ,知其组成是[Eu2 (Glu) 2 (H2 O) 8](ClO4 ) 4·H2 O ,单晶结构 ,纯度是 95.0 6%。选用Eu(NO3 ) 3 ·6H2 O、L -Glu、NaClO4 ·H2 O、NaNO3 和H2 O作辅助物 ,使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 [2Eu(NO3 ) 3 ·6H2 O +2Glu +6NaClO4 ·H2 O]和 {[Eu2 (Glu) 2 (H2 O) 8](ClO4 ) 4·H2 O +6NaNO3 +9H2 O}在 2 5℃时的溶解焓。设计一热化学循环求得化学反应的反应焓△rH0m =3 6.873kJ·mol-1,计算得配合物 [Eu2 (Glu) 2 (H2 O) 8](ClO4 ) 4·H2 O(s)在 2 98.1 5K时的标准生成焓△fH0m ,2 98.15K=-6584 .853kJ·mol-1。
Rare-earth perchlorate complex compound with L -Glutamic acid,[Eu 2(Glu) 2(H 2O) 8](ClO 4) 4·H 2O,was synthesized and obtained in the form of monocrystals.By using TG,EDTA and chemical analytic method,and comparing with relative literatures,its monocrystal structure was characterized,and it has a purification of 95.06%.A thermochemical cycle was designed at 298.15K,the chemical reaction enthalpy and standard enthalpy of formation were measured by solution calorimetry,the solution calorimetry of the reactants [2Eu(NO 3) 3·6H 2O+2Glu+6NaClO 4·H 2O] and the products ｛[Eu 2(Glu) 2(H 2O) 8](ClO 4) 4·H 2O+6NaNO 3+9H 2O｝were carried out in an isoperibel reaction calorimeter,respectively.The calormetric solvent was 2mol·L -1 HCl.According to the results,the following data were obtained:△ rH 0 m=36.873kJ·mol -1 ,△ fH 0 m([Eu 2(Glu) 2(H 2O) 8](ClO 4) 4·H 2O,s,298.15K)=-6584.853kJ·mol -1 .
出处
《孝感学院学报》
2001年第3期42-46,共5页
JOURNAL OF XIAOGAN UNIVERSITY
基金
湖北省教育厅科研计划资助项目 ( 99C0 4 4)
关键词
热化学
高氯酸铕
L-谷氨酸
标准生成焓
稀土氨基酸配合物
单晶结构
thermochemistry
europium perchlorate
L -Glutamic acid
[Eu 2(Glu) 2(H 2O) 8](ClO 4) 4·H 2O
standard enthalpy of formation
