Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 76: Issue 1
Thermochemistry of the complexes of chromium nitrate with l-a-amino acids
Authors:
S. Chen Northwest University Shaanxi Key Laboratory of Physico-Inorganic Chemistry, Department of Chemistry Xi'an 710069 P. R. China Xi'an 710069 P. R. China

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X. Yang Northwest University Shaanxi Key Laboratory of Physico-Inorganic Chemistry, Department of Chemistry Xi'an 710069 P. R. China Xi'an 710069 P. R. China

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Sh. Gao Northwest University Shaanxi Key Laboratory of Physico-Inorganic Chemistry, Department of Chemistry Xi'an 710069 P. R. China Xi'an 710069 P. R. China

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R. Hu Northwest University Shaanxi Key Laboratory of Physico-Inorganic Chemistry, Department of Chemistry Xi'an 710069 P. R. China Xi'an 710069 P. R. China

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Q. Shi Northwest University Shaanxi Key Laboratory of Physico-Inorganic Chemistry, Department of Chemistry Xi'an 710069 P. R. China Xi'an 710069 P. R. China

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Pages:
265–274
Online Publication Date:
03 Nov 2004
Publication Date:
01 Apr 2004
Article Category:
Research Article
DOI:
https://doi.org/10.1023/b:jtan.0000027825.55555.a6
Keywords:
chromium nitrate; L-a-amino acids; characterization; standard enthalpy of formation; solid complex
Restricted access

Abstract  

The solid complexes of Cr(NO3)3 with L-α-amino acids (AA=Val, Leu, Thr, Arg, Phe and Try) have been prepared in 95% alcoholic, the compositions of which were identified as the general formula Cr(AA)2(NO3)32H2O by elemental and chemical analyses. The bonding characteristics of the title complexes were characterized by IR, indicating that nitrogen and oxygen atoms in the ligands coordinated to Cr3+ in a bidentate fashion. With the aid of TG-DTG and IR techniques, the complexes were subjected to thermal decomposition in an atmosphere of oxygen, presuming that the decompositions of the complexes consist of two steps and the complexes were decomposed into chromium hemitrioxide after undergoing dehydration and skeleton splitting of the complexes. The constant volume energies of combustion of the complexes were determined by a RBC-P type rotating-bomb calorimeter. According to Hess's law, the standard enthalpies of formation of the complexes were calculated as (-1831.404.40), (-2542.036.13), (-1723.813.99), (-2224.313.02), (-2911.616.53) and (-659.327.42) kJ mol-1, respectively.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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