Thermochemical study of processes of complex formation of Cu2+ ions with L-glutamine in aqueous solutions |
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Authors: | G. G. Gorboletova S. N. Gridchin A. A. Lutsenko |
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Affiliation: | 1.Ivanovo State University of Chemical Technology,Ivanovo,Russia |
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Abstract: | Heats of the interaction of Cu(NO3)2 solutions with L-glutamine solutions were measured directly by calorimetry at a temperature of 298.15 K and ionic strength values of 0.5, 1.0, and 1.5 (KNO3). Using RRSU universal software, the experimental data were subjected to rigorous mathematical treatment with allowances made for several concurrent processes in the system. The heats of formation of the CuL+ and CuL2 complexes were calculated from the calorimetric measurements. The standard heats of the complex formation of Cu2+ with L-glutamine were obtained by extrapolation to zero ionic strength. The complete thermodynamic characteristic (Δr H o, Δr G o, Δr S o) of the complex formation processes in a Cu2+—L-glutamine system was obtained. |
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