NDLI: Heat capacity and thermodynamical properties of the crystal of [RE$_{2}$(Glu)$_{2}$(H$_{2}$O)$_{8}$](ClO$_{4}$)$_{4}$·H$

Content Provider	Springer Nature Link
Author	Wu, XinMin Li, Wei Tan, ZhiCheng Qu, SongSheng
Copyright Year	2009
Abstract	Thermodynamical data of rare earth complexes with amino acid are important for engineering chemistry and fundamental chemistry. However, they have rarely been reported. In this work, a series of crystalline complexes of rare earth perchlorate coordinated with glutamic acid have been synthesized in water medium, and their thermodynamical data, including the heat capacity in low temperature range and the standard enthalpy of formation, were determined. These complexes were identified to be [RE$_{2}$(Glu)$_{2}$(H$_{2}$O)$_{8}$](ClO$_{4}$)$_{4}$·H$_{2}$O (RE = Nd, Eu, Dy) by using thermogravimetric analysis (TG), differential thermal analysis (DTA), and chemical and elementary analyses. Their purity has been determined. No melting points were observed for all the three complexes. The heat capacity of the complexes was measured by an adiabatic calorimeter from 79 to 370 K. Abnormal heat capacity values were detected for two of the complexes and the decomposition range of one complex was found. The temperature, enthalpy change and entropy change of the decomposition processes of the three complexes were calculated. The polynomial equations of heat capacity in the experimental temperature range have been obtained by least squares fitting. The standard enthalpy of formation was determined by an isoperibol reaction calorimeter at 298.15 K.
Starting Page	862
Ending Page	867
Page Count	6
File Format	PDF
ISSN	10069291
Journal	Science in China Series B: Chemistry
Volume Number	52
Issue Number	7
e-ISSN	18622771
Language	English
Publisher	SP Science in China Press
Publisher Date	2009-06-27
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	complex of rare earth [RE$_{2}$(Glu)$_{2}$(H$_{2}$O)$_{8}$](ClO$_{4}$)$_{4}$·H$_{2}$O (RE = Nd, Eu, Dy; Glu = glutamic acid) low-temperature heat capacity standard enthalpy of formation Chemistry/Food Science
Content Type	Text
Resource Type	Article
Subject	Chemistry

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