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The thermochemistry of complexation of silver(I) with nicotinamide in water-ethanol solvents |
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| Authors: | M A Zevakin S V Dushina V A Sharnin |
| Institution: | (1) Competence Centre for Catalysis, Chalmers University of Technology, SE-412 96 Göteborg, Sweden;(2) Department of Chemical Engineering and Environmental Sciences, Chalmers University of Technology, SE-412 96 Göteborg, Sweden;(3) Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden;(4) Department of Materials and Surface Chemistry, Chalmers University of Technology, SE-412 96 Göteborg, Sweden; |
| Abstract: | The changes in the enthalpy of formation of complexes of nicotinamide with Ag+ ion at 25 ± 0.1°C and ionic strength of 0.25 (NaClO4) were obtained in the composition range of water-ethanol solvent from 0.1 to 0.9 mole fractions using precise calorimetry. We ascertained the stabilization of nicotinamide-silver(I) complexes in water-ethanol solvents and the maximum increase in exothermicity of the reaction in ethanol concentration range from 0 to 0.3 mole fractions. The enthalpy component of the change in the Gibbs energy of the complexation of Ag+ ions with NicNH2 was shown to dominate over the entropy component; the changes in thermodynamic argue for the prevailing contribution of the solvation state of a ligand to the exothermicity of complexation process at low ethanol concentrations. |
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