Synthesis and Thermochemical Properties of the Ternary Complex [Sm(m-NBA)3phen]2·2H2O

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• 作者：Sheng-Xiong Xiao ; Jian-Jun Zhang ; Xu Li ; Li-Juan Ye ; Hui-Wen Gu ; Ning Ren
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2010
• 出版时间：April 8, 2010
• 年：2010
• 卷：55
• 期：4
• 页码：1688-1692
• 全文大小：163K
• 年卷期：v.55,no.4(April 8, 2010)
• ISSN：1520-5134

文摘

The coordination complex [Sm(m-NBA)₃phen]₂·2H₂O, synthesized via the reaction of samarium chloride hexahydrate (SmCl₃·6H₂O, CAS No. 13465-55-9) with m-nitrobenzoic acid (m-HNBA, C₇H₅NO₄, CAS No. 121-92-6) and 1,10-phenanthroline (phen, C₁₂H₈N₂, CAS No. 66-71-7), was characterized by IR and elemental analysis, molar conductance, and thermogravimetric analysis. The dissolution enthalpies of [m-HNBA(s)], [phen·H₂O(s)], [SmCl₃·6H₂O(s)], and [Sm(m-NBA)₃phen]₂·2H₂O in the calorimetric solvent were determined by the solution-reaction isoperibol calorimeter at 298.15 K to be Δ_sH_m^θ[6m-HNBA(s), 298.15 K] = (97.72 ± 1.05) kJ·mol⁻¹, Δ_sH_m^θ[2phen·H₂O(s), 298.15 K] = −(11.40 ± 0.08) kJ·mol⁻¹, Δ_sH_m^θ[2SmCl₃·6H₂O(s), 298.15 K] = −(94.80 ± 0.34) kJ·mol⁻¹, and Δ_sH_m^θ[[Sm(m-NBA)₃phen]₂·2H₂O(s), 298.15 K] = −(11.70 ± 0.25) kJ·mol⁻¹, respectively. The enthalpy change was determined to be Δ_rH_m^θ = (214.49 ± 1.47) kJ·mol⁻¹ for the reaction. According to the above results and the data given in the literature, the standard molar enthalpy of formation of [Sm(m-NBA)₃phen]₂·2H₂O(s) was estimated to be Δ_fH_m^θ[[Sm(m-NBA)₃ phen]₂·2H₂O(s), 298.15 K] = −(4808.8 ± 6.6) kJ·mol⁻¹ through Hess’s law.