Thermochemistry
of rare earth complexes [Ln(Ala)2(Im)(H2O)](ClO4)3
(Ln=Pr, Gd) |
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Authors: | Y M Dan Y R Zhao Y Liu S S Qu |
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Institution: | (1) School of Chemistry and Environmental Engineering, Hubei Institute for Nationalities, Enshi, P. R. China, 445000;(2) College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, P. R. China, 430072 |
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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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Keywords: | complex of rare earth DL-α -alanine imidazole solution– reaction calorimetry standard enthalpy of formation |
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