Thermochemical Study of [Ce(Hsal)2·(tch)]·2H2O

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• 作者：Li Xu ; Xiao Sheng-Xiong ; Ye Li-Juan ; Li Ai-Tao ; Yang De-Jun ; Li Xia ; Li Qiang-Guo
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2010
• 出版时间：August 12, 2010
• 年：2010
• 卷：55
• 期：8
• 页码：2874-2878
• 全文大小：146K
• 年卷期：v.55,no.8(August 12, 2010)
• ISSN：1520-5134

文摘

The reaction of cerium chloride heptahydrate with salicylic acid and thioproline produced [Ce(Hsal)₂·(tch)]·2H₂O [Hsal = salicylate (C₇H₅O₃⁻), tch = thioprolinate (C₄H₆NO₂S⁻))], which was isolated and characterized by IR, elemental, chemical, and thermogravimetric analysis. The standard molar enthalpies of solution of [CeCl₃·7H₂O(s)], [2C₇H₆O₃(s)], [C₄H₇NO₂S(s)], and [Ce(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 Δ_sH_m^Θ[CeCl₃·7H₂O(s), 298.15 K] = −(42.22 ± 0.37) kJ·mol⁻¹, Δ_sH_m^Θ[2C₇H₆O₃(s), 298.15 K] = (45.54 ± 0.37) kJ·mol⁻¹, Δ_sH_m^Θ[C₄H₇NSO₂(s), 298.15 K] = (21.91 ± 0.60) kJ·mol⁻¹, and Δ_sH_m^Θ[Ce(Hsal)₂·(tch)·2H₂O(s), 298.15 K] = −(30.87 ± 0.39) kJ·mol⁻¹. The enthalpy change of the reaction CeCl₃·7H₂O(s) + 2C₇H₆O₃(s) + C₄H₇NO₂S(s) = [Ce(Hsal)₂·(tch)]·2H₂O(s) + 3HCl(g) + 5H₂O(l) was determined to be Δ_rH_m^Θ = (263.12 ± 0.95) kJ·mol⁻¹. From data in the literature, through Hess’s law, the standard molar enthalpy of formation of [Ce(Hsal)₂·(tch)]·2H₂O(s) was estimated to be Δ_fH_m^Θ[Ce(Hsal)₂·(tch)·2H₂O(s), 298.15 K] = −(2785.7 ± 3.2) kJ·mol⁻¹.