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采用具有恒温环境的反应热量计 ,以 2 mol· L- 1 HCl作为量热溶剂 ,分别测定了 Nd Cl3· 6 H2 O(s) +3Gly(s) (Gly代表甘氨酸 )和配合物 Nd(Gly) 3Cl3· 3H2 O(s)在 2 m ol· L- 1 HCl溶液中的溶解焓变。根据盖斯定律设计了一个热化学循环 ,由此可计算得到六水氯化钕与甘氨酸配位反应的反应焓△ r Hθm(2 98.2 K) =- 13.6 32 k J·mol- 1 ;并估算出配合物 Nd(Gly) 3Cl3· 3H2 O的标准生成焓△ f Hθm(2 98.2 K) =- 36 42 .2 3k J· mol
NdCl3 · 6H 2 O (s) + 3Gly (s) (Gly stands for glycine) and the complex Nd (Gly) have been measured using a reaction calorimeter with constant temperature and 2 mol·L -1 HCl as the quantitative heat flux. ) 3Cl3 · 3H2 O (s) Dissolution enthalpy change in 2 mol · L-1 HCl solution. According to Gass’s law, a thermochemical cycle was designed, and the enthalpy △ r Hθm (2 98.2 K) = -13.6 32 k J · mol -1 of coordination reaction between neodymium chloride hexahydrate and glycine was calculated. The standard enthalpy of formation of complex Nd (Gly) 3Cl3 · 3H2O is f Hθm (2 98.2 K) = -36 42.2k · mol