六水氯化钐与甘氨酸丙氨酸三元固态配合物的热化学

Thermochemistry of the Ternary Solid Complex of Samarium Chloride Six-hydrate with Alanine and Glycine

合成了 Sm3 +与甘氨酸丙氨酸混配体配合物 ,通过红外光谱分析、热重分析和化学分析 ,确定了配合物的组成为 :Sm( Gly) 2 ( Ala) 3 Cl3 · 2 H2 O,并用溶解量热法分别测定了 Sm Cl3 · 6H2 O( s) ,2 Gly( s) + 3Ala( s)和 Sm( Gly) 2 ( Ala) 3 Cl3 · 2 H2 O( s)在 2 mol/L HCl中的溶解焓 ;再根据盖斯定律设计了一个热化学循环 ,计算得到了六水氯化钐与甘氨酸丙氨酸反应的反应焓△ r Hθm( 2 98.1 5 K) =2 .1 60 k J/mol,并求出了 Sm( Gly) 2 ( Ala) 3 Cl3 · 2 H2 O( s)标准生成焓△f Hθm[Sm( Gly) 2 ( Ala) 3 Cl3 ·2 H2 O,s,2 98.1 5 K]=- 44 81 .5 k

The complex of Sm 3+ with glycine and alanine, Sm(Gly) 2(Ala) 3Cl 3·2H 2O, was synthesized and characterized by IR, thermogravimatric analysis and chemical analysis. The dissolution enthalpies of SmCl 3·6H 2O(s), 2Gly(s)+3Ala(s) and Sm(Gly) 2(Ala) 3Cl 3·2H 2O(s) were determined in 2 mol/L HCl by classical solution calorimetry. By designing a thermochemical cycle with Hess law, the reaction enthalpy of samarium chloride six hydrate with glycine and alanine, △ r H θ m(298.15K)=2.160 kJ/mol, and the standard formation enthalpy of Sm(Gly) 2(Ala) 3Cl 3·2H 2O(s),△ f H θ m[Sm(Gly) 2(Ala) 3Cl 3·2H 2O,s,298.15 K]=-4481.5 kJ/mol, were calculated.