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Thermochemistry of rare earth complexes [Ln(Ala)2(Im)(H2O)](ClO4)3 (Ln=Pr, Gd)

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Abstract

The two complexes, [Ln(Ala)2(Im)(H2O)](ClO4)3 (Ln=Pr, Gd), were synthesized and characterized. Using a solution-reaction isoperibol calorimeter, standard enthalpies of reaction of two reactions: LnCl3⋅6H2O(s)+2Ala(s)+Im(s)+3NaClO4(s)=[Ln(Ala)2(Im)(H2O)](ClO4)3(s)+3NaCl(s)+5H2O(l) (Ln=Pr, Gd), at T=298.15 K, were determined to be (39.26±0.10) and (5.33±0.12) kJ mol–1 , respectively. Standard enthalpies of formation of the two complexes at T=298.15 K, ΔfHΘm {[Ln(Ala)2(Im)(H2O)](ClO4)3(s)} (Ln=Pr, Gd), were calculated as –(2424.2±3.3) and –(2443.4±3.3) kJ mol–1 , respectively.

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Authors and Affiliations

  1. School of Chemistry and Environmental Engineering, Hubei Institute for Nationalities, Enshi, P. R. China, 445000

    Dan Y. M.

  2. College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, P. R. China, 430072

    Zhao Y. R., Liu Y. & Qu S. S.

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  1. Dan Y. M.
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  2. Zhao Y. R.
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  3. Liu Y.
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  4. Qu S. S.
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Correspondence to Dan Y. M..

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Dan, Y.M., Zhao, Y.R., Liu, Y. et al. Thermochemistry of rare earth complexes [Ln(Ala)2(Im)(H2O)](ClO4)3 (Ln=Pr, Gd). J Therm Anal Calorim 84, 531–534 (2006). https://doi.org/10.1007/s10973-005-7005-0

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