| Thermochemical Study on [La(Hsal)2•(tch)]•2H2O [Hsal＝salicylate ( ), tch＝thioprolinate (C4H6NO2S-)] |
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| 作者姓名： | YANG De-Jun LI Xu LI Qiang-Guo LI Ai-Tao YE Li-Juan JIANG Jian-Hong LIU Yi |
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| 作者单位： | Department of Chemistry and Life Science, Xiangnan University, Chenzhou, Hunan 423000, China ;College of Chemistry and Molecular Science, Wuhan University, Wuhan, Hubei 430062, China ; |
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| 摘 要： | The product from reaction of lanthanum chloride heptahydrate with salicylic acid and thioproline, La(Hsal)2•(tch)]•2H2O, was synthesized and characterized by IR, elemental analysis, molar conductance, thermogravimatric analysis and chemistry analysis. The standard molar enthalpies of solution of LaCl3•7H2O (s), 2C7H6O3 (s)], C4H7NO2S (s) and La(Hsal)2•(tch)]•2H2O (s) in a mixed solvent of absolute ethyl alcohol, dimethyl sulfoxide (DMSO) and 3 mol•L－1 HCl were determined by calorimetry to be LaCl3•7H2O (s), 298.15 K]＝(－102.36±0.66) kJ•mol－1, 2C7H6O3 (s), 298.15 K]＝(26.65±0.22) kJ•mol－1, C4H7NO2S (s), 298.15 K]＝(－21.79±0.35) kJ•mol－1 and {La(Hsal)2•(tch)]•2H2O (s), 298.15 K}＝(－41.10±0.32) kJ•mol－1. The enthalpy change of the reaction LaCl3•7H2O (s)＋2C7H6O3 (s)＋C4H7NO2S (s)＝La(Hsal)2•(tch)]•2H2O (s)＋3HCl (g)＋5H2O (l) (Eq. 1) was determined to be ＝(41.02±0.85) kJ•mol－1. From date in the literature, through Hess’ law, the standard molar enthalpy of formation of La(Hsal)2•(tch)]•2H2O (s) was estimated to be {La(Hsal)2•(tch)]•2H2O (s), 298.15 K}＝(－3017.0±3.7) kJ•mol－1.
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| 关 键 词： | lanthanum chloride heptahydrate salicylic acid thioproline standard molar enthalpy of formation isoperibol solution-reaction calorimetry |
| 收稿时间： | 2008-3-21 |
| 修稿时间： | 2008-7-8 |
Thermochemical Study on [La(Hsal)2·(tch)]·2H2O [Hsal=salicylate (C7H5O3−), tch=thioprolinate (C4H6NO2S−)] |
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| YANG De-Jun,LI Xu,LI Qiang-Guo,LI Ai-Tao,YE Li-Juan,JIANG Jian-Hong,LIU Yi.Thermochemical Study on [La(Hsal)2·(tch)]·2H2O [Hsal=salicylate (C7H5O3−), tch=thioprolinate (C4H6NO2S−)][J].Chinese Journal of Chemistry,2008,26(12):2155-2160. |
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| Authors: | De‐Jun YANG Xu LI Qiang‐Guo LI Ai‐Tao LI Li‐Juan YE Jian‐Hong JIANG Yi LIU |
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| Institution: | 1. Department of Chemistry and Life Science, Xiangnan University, Chenzhou, Hunan 423000, China;2. Tel.: 027‐87543232;3. Fax: 086‐027‐87543632;4. College of Chemistry and Molecular Science, Wuhan University, Wuhan, Hubei 430062, China |
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| Abstract: | The product from reaction of lanthanum chloride heptahydrate with salicylic acid and thioproline, La(Hsal)2·(tch)]·2H2O, was synthesized and characterized by IR, elemental analysis, molar conductance, thermogravimatric analysis and chemistry analysis. The standard molar enthalpies of solution of LaCl3·7H2O (s), 2C7H6O3 (s)], C4H7NO2S (s) and La(Hsal)2·(tch)]·2H2O (s) in a mixed solvent of absolute ethyl alcohol, dimethyl sulfoxide (DMSO) and 3 mol·L?1 HCl were determined by calorimetry to be ΔsHm?LaCl3·7H2O (s), 298.15 K] = (?102.36±0.66) kJ·mol?1, ΔsHm?2C7H6O3 (s), 298.15 K] = (26.65±0.22) kJ·mol?1, ΔsHm?C4H7NO2S (s), 298.15 K] = (?21.79±0.35) kJ·mol?1 and ΔsHm?{La(Hsal)2·(tch)]·2H2O (s), 298.15 K}= (?41.10±0.32) kJ·mol?1. The enthalpy change of the reaction LaCl3·7H2O (s)+2C7H6O3 (s)+C4H7NO2S (s) = La(Hsal)2·(tch)]·2H2O (s)+3HCl (g)+5H2O (l) (Eq. 1) was determined to be ΔrHm?= (41.02±0.85) kJ·mol?1. From date in the literature, through Hess' law, the standard molar enthalpy of formation of La(Hsal)2·(tch)]·2H2O (s) was estimated to be ΔfHm?{La(Hsal)2·(tch)]·2H2O (s), 298.15 K}= (?3017.0±3.7) kJ·mol?1. |
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| Keywords: | lanthanum chloride heptahydrate salicylic acid thioproline standard molar enthalpy of formation isoperibol solution‐reaction calorimetry |
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