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La(C_7H_5O_3)_2·(C_9H_6NO)的合成及热化学研究 被引量:7

Synthesis and Thermochemical Studies of La(C_7H_5O_3)_2·(C_9H_6NO)
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摘要 研究由七水氯化镧与水杨酸、8-羟基喹啉反应合成镧与水杨酸、8-羟基喹啉多元混合配合物,并对该配合物进行表征。测定该合成反应的标准摩尔反应焓以及配合物的标准摩尔生成焓。通过红外光谱、元素分析、摩尔电导率、差热热重分析以及化学分析等方法来确定配合物的组成。应用溶解量热法分别测定了七水氯化镧、水杨酸、8-羟基喹啉和配合物在298.15 K、混合量热溶剂(VDMF∶VEtOH∶VHClO4=1∶1∶0.5)中的标准摩尔溶解焓。通过设计热化学循环,根据盖斯定律计算了合成反应的标准摩尔反应焓以及配合物的标准摩尔生成焓。该配合物的分子式是La(C7H5O3)2.(C9H6NO)。各物质的溶解焓分别为ΔSHΘm[LaCl3.7H2O(s),298.15 K]=-96.45±0.18 kJ.mol-1,ΔSHΘm[2 C7H6O3(s),298.15 K]=14.99±0.17 kJ.mol-1,ΔSHΘm[C9H7NO(s),298.15 K]=-3.86±0.06 kJ.mol-1及ΔSHΘm[La(C7H5O3)2.(C9H6NO)(s),298.15 K]=-117.78±0.11 kJ.mol-1。反应LaCl3.7H2O(s)+2C7H6O3(s)+C9H7NO(s)=La(C7H5O3)2.(C9H6NO)(s)+3HCl(g)+7H2O(l)的标准摩尔反应焓为91.57±0.33 kJ.mol-1。La(C7H5O3)2.(C9H7NO)(s)的标准摩尔生成焓为ΔSHΘm[La(C7H5O3)2.(C9H6NO)(s),298.15 K]=-2076.5±3.9 kJ.mol-1。 The mixed complex produced from reaction of lanthanum chloride seven-hydrate with salicylic acid and 8-hydroxyquinoline, La (C7HsO3)2· (C9H6NO), was synthesized and characterized by IR, elemental analysis, molar conductance, and thermogravimatric analysis. The standard molar enthalpies of solution of [LaCl3·7H2O (s)], [2C7H6O3 (s)], [C9H7NO(s)] and [La(C7H5O3)2·(C9H6NO)(s)] in the calorimetric solvent(a mixed solution consisting of absolute ethyl alcohol, dimethyl formamide ( DMF ) and perchloric acid ( VDMF : VEtOH : VHCIO4 =1:1:0.5)) were determined by using the solution-reaction isoperibol calorimeter at 298.15 K to be △sHm^θ[LaCl3·7H2O(s), 298.15 K] =-96.45± 0.18 kJ·mo1^-1, △sHm^θ[2 C7H6O3(s),298.15 K] = 14.99±0.17 kJ·mo1^-1,△sHm^θ[C9H7NO (s), 298.15 K] = -3.86±0.06 kJ·mo1^-1 and △sHm^θ[La(C7H5O3)2·(C9H6NO) (s), 298. 15 K] =-117.78±0.11 kJ· mo1^-1, respectively. The reaction enthalpy of the reaction LaCl3·7H2O (s)+2C7H6O3(s) + C9H7NO(s) = La(C7H5O3)2·(C9H6NO) (s)+3HCl(g)+ 7H2O(1) was determined to be△sHm^θ = 91.57±0.33 kJ·mo1^-1. According to the above results and the data given in literature, through Hess'law, the standard molar enthalpy of formation of La(C7H5O3)2·(C9H7NO)(s) is estimated to be △sHm^θ[La(C7H5O3)2· (C9H6NO) (s), 298.15 K] =-2076.5±3.9 kJ·mol^-1.
出处 《稀有金属》 EI CAS CSCD 北大核心 2006年第3期343-347,共5页 Chinese Journal of Rare Metals
基金 湖南省自然科学基金资助课题(03JJY3019)
关键词 七水氯化镧 水杨酸 8-羟基喹啉 标准摩尔生成焓 lanthanum chloride seven-hydrate salicylic acid 8-hydroxyquinoline standard molar enthalpies of formation
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