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Synthesis, characterization and standard molar enthalpy of formation of Nd(C7H5O3)2·(C9H6NO)

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Abstract

The complex from reaction of neodymium chloride six-hydrate with salicylic acid and 8-hydroxyquinoline, Nd(C7H5O3)2·(C9H6NO), was synthesized and characterized by IR, elemental analysis, molar conductance, and thermogravimatric analysis. The standard molar enthalpies of solution of [NdCl3·6H2O(s)], [2C7H6O3(s)], [C9H7NO(s)] and [Nd(C7H5O3)2·(C9H6NO)(s)] in a mixed solvent of anhydrous ethanol, dimethyl formamide (DMF) and perchloric acid were determined by calorimetry at 298.15 K. Based on Hess’ law, a new chemical cycle was designed, and the enthalpy change of the reaction

$$ NdCl_3 \cdot 6H_2 O(s) + 2C_7 H_6 O_3 (s) + C_9 H_7 NO(s) = Nd(C_7 H_5 O_3 )_2 \cdot (C_9 H_6 NO)(s) + 3HCl(g) + 6H_2 O(l) $$
((1))

was determined to be Δr H Θm =117.89±0.37 kJ mol−1. From data in the literature, through Hess’ law, the standard molar enthalpy of formation of Nd(C7H5O3)2·(C9H7NO)(s) was estimated to be Δf H Θm [Nd(C7H5O3)2·(C9H6NO)(s), 298.15 K]=−2031.80±8.6 kJ mol−1.

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Authors and Affiliations

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

    L. Qiang-Guo, H. Yi, L. Xu, Y. Li-Juan, X. Sheng-Xiong, Y. De-Jun & L. Yi

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

    L. Yi

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  1. L. Qiang-Guo
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  2. H. Yi
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  3. L. Xu
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  4. Y. Li-Juan
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  6. Y. De-Jun
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  7. L. Yi
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Correspondence to L. Qiang-Guo.

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Project supported by the Natural Sciences Foundation of Hunan Provincial of China (No. 03JJY3019)

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Qiang-Guo, L., Yi, H., Xu, L. et al. Synthesis, characterization and standard molar enthalpy of formation of Nd(C7H5O3)2·(C9H6NO). J Therm Anal Calorim 91, 615–620 (2008). https://doi.org/10.1007/s10973-007-8335-x

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  • DOI: https://doi.org/10.1007/s10973-007-8335-x

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