三氯醋酸钕与8-羟基喹啉配合物的热化学研究  

A Thermochemical Study on the Coordination Complexe of Neodymium Trichloroacetate with 8-Hydroxyquinoline

作　　者：李强国[1] 叶丽娟[1] 屈景年[2] 刘志国 刘义[2] 屈松生[2] 

机构地区：[1]郴州师范高等专科学校化学系,郴州423000 [2]武汉大学化学与环境科学学院,武汉430072

出　　处：《中国稀土学报》2002年第4期293-298,共6页Journal of the Chinese Society of Rare Earths

基　　金：湖南省教育厅资助课题 (0 0C0 0 1)

摘　　要：用溶解量热法 ,在自行研制的具有恒定温度环境的新型反应量热计中 ,测定了NdCl3·6H2 O(s)、CCl3COOH(s)和Nd(TCA) 3·3H2 O(s)在1mol/LHCl中的溶解焓。再根据盖斯定律设计了一个热化学循环 ,计算得到了六水合氯化钕与三氯醋酸反应的反应焓ΔrHmθ(2 98.15K) =2 0 1.688kJ/mol,并求出了Nd(TCA) 3·3H2 O(s)的标准生成焓ΔfHmθ[Nd(TCA) 3·3H2 O ,s ,2 98.15K ] =-3 0 5 3 .3kJ/mol。同时测定了Nd(TCA) 3·3H2 O(s) ,C9H7NO(s) ,Nd(TCA) (C9H6 NO) 2 (s)和CCl3COOH(s)在 4mol/LHCl、二甲亚砜和无水乙醇混合溶剂中的溶解焓 ,再根据盖斯定律设计了一个热化学循环 ,计算得到了三氯醋酸钕与 8 羟基喹啉反应的反应焓ΔrHmθ(2 98.15K) =-3 .2 2 6kJ/mol,并求出了Nd(TCA) (C9H6 NO) 2 (s)的标准生成焓ΔfHmθ[Nd(TCA) (C9H6 NO) 2 ,s ,2 98.15K] =-13 5 5 .6kJ/mol。The standard molar reaction enthalpies of two reactions, NdCl 3·6H 2O(s) +3CCl 3COOH(s)(TCA) =Nd(TCA) 3·3H 2O(s) +3HCl(g) +3H 2O(l) and Nd(TCA) 3·3H 2O(s) +2C 9H 7NO(s)= Nd(TCA)(C 9H 6NO) 2 (s) +2CCl 3COOH(s) +3H 2O(l), were studied by the classical solution calorimetry. The molar dissolution enthalpies of the reactants and the products of the two reactions in certain solvent (for one reaction is in 1 mol/L HCl and another in a mixed solution consisting of absolute ethyl alcohol, dimethyl sulfoxide and 4 mol/L HCl) were measured by using an isoperibol calorimeter. From the results and other auxiliary quantities, the standard molar formation enthalpies of [Nd(TCA) 3·3H 2O,s,298.15K] and [Nd(TCA) (C 9H 6NO) 2, s, 298.15 K] were determined to be Δ fH m θ [Nd(TCA) 3·3H 2O,s,298.15 K]=-3053.3 kJ/mol and Δ fH m θ [Nd(TCA) (C 9H 6NO) 2 ,s, 298.15 K] = -1355.6 kJ/mol.

关 键 词：三氯醋酸钕 配合物 稀土 8-羟基喹啉 热化学 标准生成焓 

分 类 号：O614.335[理学—无机化学] O642.3[理学—化学]