Dissociation of HNO3 in water revisited: experiment and theory

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Munar I., Özer M. Ö., Fusco E., ÜNER D., Aviyente V., Bühl M.

Physical Chemistry Chemical Physics, cilt.26, sa.23, ss.16616-16624, 2024 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 26 Sayı: 23
  • Basım Tarihi: 2024
  • Doi Numarası: 10.1039/d4cp01667j
  • Dergi Adı: Physical Chemistry Chemical Physics
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, INSPEC, MEDLINE
  • Sayfa Sayıları: ss.16616-16624
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

Nitric acid dissociation in water is studied as a function of concentration, employing experimental techniques (1H 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 HNO3(H2O)x (x = 1-8), as well as periodic liquids (HNO3 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 1H 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.