Thermodynamic characteristics of the formation reactions of nickel(II) glycinates and the solvation of reagents in aqueous ethanol solutions |
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Authors: | S V Mikheev V A Sharnin |
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Institution: | (1) Institute of Physical-Chemical Processes of National Research Council, Via Moruzzi 1, 56126 Pisa, Italy;(2) Ivanovo State University of Chemistry and Technology, pr. F. Engels, 7, 153000 Ivanovo, Russia |
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Abstract: | Enthalpies of complexation reactions between nickel(II) and the glycinate ion in mixtures of water with ethanol containing
up to 0.5 mole fraction ethanol were obtained by the calorimetric titration method at 298 K. With increasing ethanol concentration
exothermicity of complexation was found to increase slightly for the first coordination step. The results obtained were analyzed
from the standpoint of solvation approach based on thermodynamic characteristics of all reagents. It was shown that the main
cause of the increase in the exothermicity of complexation reactions is the weakening of ligand solvation with increasing
ethanol concentration. |
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Keywords: | |
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