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Calorimetric study and thermal analysis of [ErY(Ala)4(H2O)8](ClO4)6 (Ala=ALANINE)

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Abstract

A solid complex of rare-earth compounds with alanine, [ErY(Ala)4(H2O)8](ClO4)6 (Ala=alanine), was synthesized, and a calorimetric study and thermal analysis for it was performed through adiabatic calorimetry and thermogravimetry. The low-temperature heat capacity of [ErY(Ala)4(H2O)8](ClO4)6 was measured with an automated adiabatic precision calorimeter over the temperature range from 78 to 377 K. A solid-solid phase transition was found between 99 and 121 K with a peak temperature at 115.78 k. The enthalpy and entropy of the phase transition was determined to be 1.957 Kj mol-1, 16.90 j mol-1 k-1, respectively. Thermal decomposition of the complex was investigated in the temperature range of 40~550°C by use of the thermogravimetric and differential thermogravimetric (TG/DTG) analysis techniques. The TG/DTG curves showed that the decomposition started from 120 and ended at 430°C, completed in three steps. A possible mechanism of the thermal decomposition was elucidated.

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Authors and Affiliations

  1. Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 110623, p. r. China

    B. P. Liu, Z. C. Tan, Z. D. Nan, L. X. Sun, F. Xu & X. Z. Lan

  2. Department of Chemistry, Changde Normal College, Changde, 415000, p. r., China

    P. Liu

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  1. B. P. Liu
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  2. Z. C. Tan
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  3. Z. D. Nan
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  4. P. Liu
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  5. L. X. Sun
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  6. F. Xu
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  7. X. Z. Lan
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Correspondence to Z. C. Tan.

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Liu, B.P., Tan, Z.C., Nan, Z.D. et al. Calorimetric study and thermal analysis of [ErY(Ala)4(H2O)8](ClO4)6 (Ala=ALANINE). Journal of Thermal Analysis and Calorimetry 71, 623–628 (2003). https://doi.org/10.1023/A:1022824530862

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  • DOI: https://doi.org/10.1023/A:1022824530862

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