Calorimetric study and thermal analysis of [Gd4/3Y2/3(Gly)6(H2O)4](ClO4)6·5H2O and [ErY(Gly)6(H2O)4](ClO4)6·5H2O (Gly: glycin) |
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| Authors: | Bei-Ping Liu Zhi-Cheng Tan Xiao-Zheng LanHua-Guang Yu Da-Shun ZhangLi-Xian Sun |
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| Institution: | a Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China
b Department of Chemistry, Changde Normal College, Changde 415000, PR China |
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| Abstract: | Two solid-state coordination compounds of rare earth metals with glycin, Gd4/3Y2/3(Gly)6(H2O)4](ClO4)6·5H2O and ErY(Gly)6(H2O)4](ClO4)6·5H2O were synthesized. The low-temperature heat capacities of the two coordination compounds were measured with an adiabatic calorimeter over the temperature range from 78 to 376 K. Gd4/3Y2/3(Gly)6(H2O)4](ClO4)6·5H2O melted at 342.90 K, while ErY(Gly)6(H2O)4](ClO4)6·5H2O melted at 328.79 K. The molar enthalpy and entropy of fusion for the two coordination compounds were determined to be 18.48 kJ mol−1 and 53.9 J K−1 mol−1 for Gd4/3Y2/3(Gly)6(H2O)4](ClO4)6·5H2O, 1.82 kJ mol−1 and 5.5 J K−1 mol−1 for ErY(Gly)6(H2O)4](ClO4)6·5H2O, respectively. Thermal decompositions of the two coordination compounds were studied through the thermogravimetry (TG). Possible mechanisms of the decompositions are discussed. |
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| Keywords: | [Gd4/3Y2/3(Gly)6(H2O)4](ClO4)6· 5H2O [ErY(Gly)6(H2O)4](ClO4)6· 5H2O Heat capacity Thermal decomposition Adiabatic calorimeter TG analysis |
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