| Autor: |
Munar I; Chemistry Department, Bogazici University, 34342 Bebek, Istanbul, Turkey. aviye@boun.edu.tr., Özer MÖ; Middle East Technical University, Chemical Engineering, 06800 Ankara, Turkey. uner@metu.edu.tr., Fusco E; EaStCHEM School of Chemistry and Centre of Magnetic Resonance, University of St Andrews, North Haugh, St Andrews KY16 9ST, UK. buehl@st-andrews.ac.uk., Uner D; Middle East Technical University, Chemical Engineering, 06800 Ankara, Turkey. uner@metu.edu.tr., Aviyente V; Chemistry Department, Bogazici University, 34342 Bebek, Istanbul, Turkey. aviye@boun.edu.tr., Bühl M; EaStCHEM School of Chemistry and Centre of Magnetic Resonance, University of St Andrews, North Haugh, St Andrews KY16 9ST, UK. buehl@st-andrews.ac.uk. |
| Abstrakt: |
Nitric acid dissociation in water is studied as a function of concentration, employing experimental techniques ( 1 H NMR spectroscopy and calorimetry), quantum chemical methods (B3LYP and PBE functionals for molecular clusters) and molecular dynamics simulations (the PBE-D3 functional for solutions under periodic boundary conditions). The extent of dissociation, via proton transfer to a neighboring water molecule, as a function of concentration is studied computationally for molecular nitric acid clusters HNO 3 (H 2 O) x ( x = 1-8), as well as periodic liquids (HNO 3 mole fractions of 0.19 and 0.5, simulated at T = 300 K and 450 K). Despite the simple nature of these structural models, their computed and simulated average 1 H chemical shifts compare well with the experimental measurements in this study. Finally, the measured and calculated chemical shifts have shown reasonable relationships with the enthalpy change upon mixing of this binary complex. |
