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Thermochemical study of [Sm(C7H5O3)2·(C4H6NO2S)]·2H2O

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Abstract

The product from reaction of samarium chloride hexahydrate with salicylic acid and Thioproline, [Sm(C7H5O3)2·(C4H6NO2S)]·2H2O, was synthesized and characterized by IR, elemental analysis, molar conductance, and thermogravimetric analysis. The standard molar enthalpies of solution of [SmCl3·6H2O(s)], [2C7H6O3(s)], [C4H7NO2S(s)] and [Sm(C7H5O3)2·(C4H7NO2S)·H2O(s)] in a mixed solvent of absolute ethyl alcohol, dimethyl sulfoxide(DMSO) and 3 mol L−1 HCl were determined by calorimetry to be Δs H Φm [SmCl3 δ6H2O (s), 298.15 K]= −46.68±0.15 kJ mol−1 Δs H Φm [2C7H6O3 (s), 298.15 K]= 25.19±0.02 kJ mol−1, Δs H Φm [C4H7NO2S (s), 298.15 K]=16.20±0.17 kJ mol−1 and Δs H Φm [Sm(C7H5O3)2·(C4H6NO2S)]·2H2O (s), 298.15 K]= −81.24±0.67 kJ mol−1. The enthalpy change of the reaction

$$ SmCl_3 \cdot 6H_2 O(s) + 2C_7 H_6 O_3 (s) + C_4 H_7 NO_2 S(s) = Sm(C_7 H_5 O_3 )_2 \cdot (C_4 H_6 NO_2 S) \cdot 2H_2 O(s) + 3HCl(g) + 4H_2 O(1) $$
((1))

was determined to be Δs H Φm =123.45±0.71 kJ mol−1. From date in the literature, through Hess’ law, the standard molar enthalpy of formation of Sm(C7H5O3)2(C4H6NO2S)δ2H2O(s) was estimated to be Δs H Φm [Sm(C7H5O3)2·(C4H6NO2S)]·2H2O(s), 298.15 K]= −2912.03±3.10 kJ mol−1.

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Authors and Affiliations

  1. Department of Chemistry and Life Science, Xiangnan University, Chenzhou, Hunan, 423000, China

    L. Xu, Y. De-Jun, L. Qiang-Guo, L. Ai-Tao, Y. Li-Juan, J. Qian-Hong & L. Yi

  2. College of Chemistry and Molecular Science, Wuhan University, Wuhan, 430062, China

    L. Yi

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  1. L. Xu
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  2. Y. De-Jun
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Correspondence to L. Qiang-Guo.

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Xu, L., De-Jun, Y., Qiang-Guo, L. et al. Thermochemical study of [Sm(C7H5O3)2·(C4H6NO2S)]·2H2O. J Therm Anal Calorim 95, 579–584 (2009). https://doi.org/10.1007/s10973-008-9270-1

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