Thermochemistry on the complex of erbium perchlorate with L-alpha-glutamic acid [Er-2(L-Glu)(2)(H2O)(6)](ClO4)(4)center dot 6H(2)O(S)
Di You-Ying; Zhang Jian; Tan Zhi-Cheng; Di YY(邸友莹); Di YY(邸友莹)
Keyword[Er-2(Glu)(2)(H2o)(6)](Clo4)(4)Center Dot 6h(2)o(s) Adiabatic Calorimetry Heat Capacity Isoperibol Solution-reaction Calorimetry Standard Molar Enthalpy Of Formation
Indexed BySCI
Funding Project1504
Contribution Rank2;2
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectChemistry, Multidisciplinary
WOS Research AreaChemistry
AbstractA coordination compound of erbium perchlorate with L-alpha-glutamic acid, [Er-2(GIU)(2)((HO)-O-2)(6)](C1O(4))(4)center dot 6H(2)O(s), was synthesized. By chemical analysis, elemental analysis, FTIR, TG/DTQ and comparison with relevant literatures, its chemical composition and structure were established. The mechanism of thermal decomposition of the complex was deduced on the basis of the TG/DTG analysis. 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 290-318 K, which was ascribed to a solid-to-solid phase transition. The temperature T-trans, 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) kJ center dot mol(-1) and (33.9 +/- 0.2) J center dot K-1 center dot 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. Standard molar enthalpies of dissolution of the mixture [2ErCl(3)center dot 6H(2)O(s)+2L-Glu(s)+6NaC1O(4)center dot H2O(s)] and the mixture { [Er-2(Glu)(2)(H2O)(6)](C1O(4))(4 center dot)6H(2)O(s) + 6NaC1(s)} in 100 mL of 2 mol center dot dm(-3) HC1O(4) as calorimetric solvent, and 12HC104(l)) in the solution A at T=298.15 K were measured to be, Delta H-d(m,1)=(31.552 +/- 0.026) kJ center dot mol(-1), Delta H-d(m,2)=(41.302 +/- 0.034) kJ center dot mol(-1), and Delta dH(m,3) = (14.986 +/- 0.064) kJ center dot mol(-1), respectively. In accordance with Hess law, the standard molar enthalpy of formation of the complex was determined as Delta H-f Theta(m)=-(7551.0 +/- 2.4)kJ center dot mol by using an isoperibol solution-reaction calorimeter and designing a thermochemical cycle.
WOS IDWOS:000250356900005
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorDi YY(邸友莹); Di YY(邸友莹)
Affiliation1.Liaocheng Univ, Coll Chem & Chem Engn, Liaocheng 252029, Shandong, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Liaoning, Peoples R China
Recommended Citation
GB/T 7714
Di You-Ying,Zhang Jian,Tan Zhi-Cheng,et al. Thermochemistry on the complex of erbium perchlorate with L-alpha-glutamic acid [Er-2(L-Glu)(2)(H2O)(6)](ClO4)(4)center dot 6H(2)O(S)[J]. CHINESE JOURNAL OF CHEMISTRY,2007,25(10):1423-1429.
APA Di You-Ying,Zhang Jian,Tan Zhi-Cheng,邸友莹,&邸友莹.(2007).Thermochemistry on the complex of erbium perchlorate with L-alpha-glutamic acid [Er-2(L-Glu)(2)(H2O)(6)](ClO4)(4)center dot 6H(2)O(S).CHINESE JOURNAL OF CHEMISTRY,25(10),1423-1429.
MLA Di You-Ying,et al."Thermochemistry on the complex of erbium perchlorate with L-alpha-glutamic acid [Er-2(L-Glu)(2)(H2O)(6)](ClO4)(4)center dot 6H(2)O(S)".CHINESE JOURNAL OF CHEMISTRY 25.10(2007):1423-1429.
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