Low-temperature heat capacities of [Er-2(L-Glu)(2)(H2O)(6)](ClO4)(4)center dot 6H(2)O(S)
Di, You-Ying; Zhang, Jian; Tan, Zhi-Cheng
Keyword[Er-2(Glu)(2)(H2o)(6)](Clo4)(4)Center Dot 6h(2)o Adiabatic Calorimetry Low-temperature Heat Capacity Phase Transition
Indexed ByISTP ; SCI
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectChemistry, Analytical ; Chemistry, Physical
WOS Research AreaChemistry
AbstractA coordination compound of erbium perchlorate With L-alpha-glutamic acid, [Er-2(L-Glu)2(H2O)(6)](ClO4)(4).6H(2)O(S), was synthesized. By chemical analysis, elemental analysis, FTIR, TG/DTG and comparison with relevant literature, its chemical composition and structure were established. The purity was found to be >99.0%, without melting point. Low-temperature heat capacities were measured by a precision automated adiabatic calorimeter from 78 to 318 K. An endothermic peak in the heat-capacity curve was observed over the temperature region of 290-316 K, which was ascribed to a solid-to-solid phase transition. The temperature T the enthalpy Delta H-trans(m) and the entropy Delta S-trans(m) of the phase transition for the compound were determined to be: 308.73 +/- 0.45 K, 10.49 +/- 0.05 U mol(-1) and 33.9 +/- 0.2 J K-1 mol(-1). Polynomial equation of heat capacities as a function of the temperature in the region of 78-290 K was fitted by the least square method. (C) 2007 Elsevier B.V. All rights reserved.
WOS IDWOS:000250353500004
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Document Type期刊论文
Affiliation1.Liaocheng Univ, Coll Chem & Chem Engn, Liaocheng 252059, Shandong, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China
Recommended Citation
GB/T 7714
Di, You-Ying,Zhang, Jian,Tan, Zhi-Cheng. Low-temperature heat capacities of [Er-2(L-Glu)(2)(H2O)(6)](ClO4)(4)center dot 6H(2)O(S)[J]. THERMOCHIMICA ACTA,2007,463(1-2):10-12.
APA Di, You-Ying,Zhang, Jian,&Tan, Zhi-Cheng.(2007).Low-temperature heat capacities of [Er-2(L-Glu)(2)(H2O)(6)](ClO4)(4)center dot 6H(2)O(S).THERMOCHIMICA ACTA,463(1-2),10-12.
MLA Di, You-Ying,et al."Low-temperature heat capacities of [Er-2(L-Glu)(2)(H2O)(6)](ClO4)(4)center dot 6H(2)O(S)".THERMOCHIMICA ACTA 463.1-2(2007):10-12.
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