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Citation: Liu Bei-Ping, Tan Zhi-Cheng, Nan Zhao-Dong, Liu Ping, Sun Li-Xian, Xu Fen. Calorimetric Study and Thermal Analysis of [Ho₂(Ala)₄(H₂O)₈]Cl₆ and >;[ErY(Ala)₄(H₂O)₈](ClO₄)₆[J]. Acta Physico-Chimica Sinica, ;2002, 18(06): 481-485. doi: 10.3866/PKU.WHXB20020601 shu

Calorimetric Study and Thermal Analysis of [Ho₂(Ala)₄(H₂O)₈]Cl₆ and >;[ErY(Ala)₄(H₂O)₈](ClO₄)₆

1.
Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian　116023;Department of Chemistry, Changde Normal College, Changde　415000

Received Date: 28 January 2002
Available Online: 15 June 2002

Two solid complexes of rare-earth compounds with alanine, [Ho2(Ala)4(H2O)8]Cl6 and [ErY(Ala)4(H2O)8](ClO4)6 (Ala=alanine) were synthesized,and a calorimetric study and thermal analysis for the two complexes were performed through adiabatic calorimetry and thermogravimetry. The low-temperature heat capacities of [Ho2(Ala)4(H2O)8]Cl6 and [ErY(Ala)4(H2O)8](ClO4)6 were measured with an automated adiabatic precision calorimeter over the temperature range from 78 to 377 K. Solid-solid phase transitions were found between 214 K and 255 K with a peak temperature of 235.09 K for [Ho2(Ala)4(H2O)8]Cl6,between 99 K and 121 K with a peak temperature of 115.78 K for [ErY(Ala)4(H2O)8](ClO4)6.The enthalpies and entropies of the phase transitions were determined to be 3.02 kJ•mol－1,12.83 J•K－1•mol－1 for [Ho2(Ala)4(H2O)8]Cl6; 1.96 kJ•mol－1,16.90 J•K－1•mol－1 for [ErY(Ala)4(H2O)8](ClO4)6, respectively. Thermal decomposition of the two complexes were investigated in the temperature range of 40～800 ℃ by using the thermogravimetric and differential thermogravimetric (TG/DTG ) analysis techniques. The TG/DTG curves showed that the decomposition started from 80 ℃ and ended at 479 ℃,completed in two steps for [Ho2(Ala)4(H2O)8]Cl6,and started from 120 ℃ and ended at 430 ℃,completed in three steps for [ErY(Ala)4(H2O)8](ClO4)6,respectively.The possible mechanisms of the thermal decompositions were elucidated.
- [Ho₂(Ala)₄(H₂O)₈]Cl₆;[ErY(Ala)₄(H₂O)₈](ClO₄)₆;Adiabatic calorimetry;Heat capacity;Thermal decomposition
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Calorimetric Study and Thermal Analysis of [Ho2(Ala)4(H2O)8]Cl6 and >;[ErY(Ala)4(H2O)8](ClO4)6

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通讯作者: 陈斌, bchen63@163.com

Calorimetric Study and Thermal Analysis of [Ho₂(Ala)₄(H₂O)₈]Cl₆ and >;[ErY(Ala)₄(H₂O)₈](ClO₄)₆