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Synthesis, characterization and thermal studies on solid compounds of 2-chlorobenzylidenepyruvate of heavier trivalent lanthanides and yttrium(III)

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Abstract

Solid-state compounds of general formula LnL3⋅nH2O, where Ln represents heavier lanthanides and yttrium and L is 2-chlorobenzylidenepyruvate, have been synthesized. Chemical analysis, simultaneous thermogravimetry-differential analysis (TG-DTA), differential scanning calorimetry (DSC), X-ray powder diffractometry, elemental analysis and infrared spectroscopy have been employed to characterize and to study the thermal behaviour of these compounds in dynamic air atmosphere.

On heating these compounds decompose in four (Gd, Tb, Ho to Lu, Y) or five (Eu, Dy) steps. They lose the hydration water in the first step and the thermal decomposition of the anhydrous compounds up to 1200°C occurs with the formation of the respective oxide, Tb4O7 and Ln2O3 (Ln=Eu, Gd, Dy to Lu and Y) as final residue. The dehydration enthalpies found for these compounds (Eu, to Lu and Y) were: 65.77, 55.63, 86.89, 121.65, 99.80, 109.59, 131.02, 119.78, 205.46 and 83.11 kJ mol-1, respectively.

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Authors and Affiliations

  1. Instituto de Química UNESP, Araraquara, Brazil, CP 355, CEP 14801-970, SP

    Bannach G, Treu Filho O, Utuni V H S & Ionashiro M

  2. Departamento de Química, UEPG, Ponta Grossa, Brasil, 84030-000 , PR

    Schnitzler E

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  1. Bannach G
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  2. Schnitzler E
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  3. Treu Filho O
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  4. Utuni V H S
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  5. Ionashiro M
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Correspondence to Ionashiro M.

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Bannach, G., Schnitzler, E., Treu Filho, O. et al. Synthesis, characterization and thermal studies on solid compounds of 2-chlorobenzylidenepyruvate of heavier trivalent lanthanides and yttrium(III) . J Therm Anal Calorim 83, 233–240 (2006). https://doi.org/10.1007/s70973-005-6972-y

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  • DOI: https://doi.org/10.1007/s70973-005-6972-y

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