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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 complex of lanthanum with salicylic acid and 8-hydroxyquinoline was synthesized from the reaction of lanthanum chloride heptahydrate with salicylic acid and 8-hydroxyquinoline. The complex was characterized. The standard molar reaction enthalpy of the synthesis reaction and the standard molar enthalpy of formation of the complex were determined. The composition of the complex was confirmed by IR, elemental analysis, molar conductivity, DTA and chemical analysis. The content of lanthanum chloride heptahydrate, salicylic acid, 8-hydroxyquinoline and their complexes in 298.15 K, mixed amount hot solvent (VDMF: VEtOH:VHClO4 = 1: 1: 0.5) Molar enthalpy of solution. By designing the thermochemical cycle, the standard molar enthalpy of synthesis and the standard molar enthalpy of formation of the complex were calculated according to Gass’s law. The formula of the complex is La (C7H5O3) 2 (C9H6NO). The enthalpy of solution for each of the substances was 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 and ΔSHΘm [La (C7H5O3) 2. (C9H6NO) (s), 298.15 K] = -117.78 ± 0.11 kJ · mol -1 . The standard molar enthalpy of the reaction LaCl3.7H2O (s) + 2C7H6O3 (s) + C9H7NO (s) = La (C7H5O3) 2. (C9H6NO) (s) + 3HCl (g) +7 H2O (l) is 91.57 ± 0.33 kJ .mol-1. The standard molar enthalpy of formation of La (C7H5O3) 2. (C9H7NO) (s) is ΔSHΘm [La (C7H5O3) 2. (C9H6NO) (s), 298.15 K] = -2076.5 ± 3.9 kJ.mol-1.