摘要
The coordination complex Sm(C7H5O2)2·(C9H6NO), synthesized from the reaction of samarium chloride sixhydrate with salicylic acid and 8-hydroxyquinoline, was characterized with IR, elemental analysis, molar conductance, and thermogravimatric analysis. The standard molar enthalpies of solution of [ SmCl3·6H2O (s) ], [ 2C7H6O3 (s) ], [ C9H7NO ( s ) ] and [ Sm (C7H5O3) 2·( C9H6NO ) ( s ) ] in the calorimetric solvent were determined with the solution-reaction isoperibol calorimeter at 298.15 K to be △sHm^- [ SmCl3·6H2O (s), 298.15 K ] = - 103.98 ± 0.04 kJ·mol^-1, △sHm^- [2 C7H6O3 (s), 298.15 K] = 16.35±0.14 kJ·mol^-1,△sHm^-[C9H7NO (s), 298.15 K] = -6.11±0.08 kJ·mol^-1 and △sHm^-[Sm(C7H5O3)2·(C9H6NO) (s), 298.15 K] = - 130.08 ± 0.04 kJ·mol^-1, respectively. The enthalpy was determined to be △rHm^- = 89.59 ±0.18 kJ·mol^-1 for the reaction SmCl3·6H2O(s) + 2C7H6O3(s) + C9H7NO(s) = Sm (C7H5O3) 2·(C9H6NO) ( s ) + 3HCl (g) + 6H2O ( l ). According to the above results and the data given in literature and through Hess' law, the standard molar enthalpy of formation of Sin( C7H5O3 )2·(C9H7NO)(s) was estimated to be △rHm^- [ Sm (C7H5O3)2·(C9H6NO) (s), 298.15 K] = - 2055.9 ± 3.03 kJ·mol^-1.
The coordination complex Sm(C7H5O2)2·(C9H6NO), synthesized from the reaction of samarium chloride sixhydrate with salicylic acid and 8-hydroxyquinoline, was characterized with IR, elemental analysis, molar conductance, and thermogravimatric analysis. The standard molar enthalpies of solution of [ SmCl3·6H2O (s) ], [ 2C7H6O3 (s) ], [ C9H7NO ( s ) ] and [ Sm (C7H5O3) 2·( C9H6NO ) ( s ) ] in the calorimetric solvent were determined with the solution-reaction isoperibol calorimeter at 298.15 K to be △sHm^- [ SmCl3·6H2O (s), 298.15 K ] = - 103.98 ± 0.04 kJ·mol^-1, △sHm^- [2 C7H6O3 (s), 298.15 K] = 16.35±0.14 kJ·mol^-1,△sHm^-[C9H7NO (s), 298.15 K] = -6.11±0.08 kJ·mol^-1 and △sHm^-[Sm(C7H5O3)2·(C9H6NO) (s), 298.15 K] = - 130.08 ± 0.04 kJ·mol^-1, respectively. The enthalpy was determined to be △rHm^- = 89.59 ±0.18 kJ·mol^-1 for the reaction SmCl3·6H2O(s) + 2C7H6O3(s) + C9H7NO(s) = Sm (C7H5O3) 2·(C9H6NO) ( s ) + 3HCl (g) + 6H2O ( l ). According to the above results and the data given in literature and through Hess' law, the standard molar enthalpy of formation of Sin( C7H5O3 )2·(C9H7NO)(s) was estimated to be △rHm^- [ Sm (C7H5O3)2·(C9H6NO) (s), 298.15 K] = - 2055.9 ± 3.03 kJ·mol^-1.
基金
Project supported by the Hunan Provincial Natural Sciences Foundation of China (03JJY3019)