Nuclear quantum effect and H/D isotope effect on F + (H2O)n→ FH + (H2O)n-1OH (n = 1-3) reactions.
Potential energy profiles for F + (H2O)n→ FH + (H2O)n-1OH (n = 1-3) reactions, which are widely relevant to solvent effects on chemical reactions, have been investigated using the conventional quantum mechanical (QM) methods and our multicomponent QM (MC_QM) methods, which can take account of nuclear quantum effect of light nucleus, such as proton and deuteron. For these reactions, Li and co-workers [G. Li et al., J. Phys. Chem. A 117, 11979 (2013)] reported that (i) for F + H2O → FH + OH reaction, MPW1K density functional gave the best barrier among 49 kinds of density functionals and (ii) the energy of transition state of F + (H2O)2→ FH + (H2O)OH reaction is lower than that of the separated reactant molecules by the contribution of the second water molecule using high-accuracy CCSD(T)/cc-pVQZ calculations. We have found that ω B97XD density functional reasonably reproduces the CCSD(T) geometries well, whereas MPW1K was not suited for analyzing F + (H2O)2→ FH + (H2O)OH reaction. Our MC_QM calculations reveal that nuclear quantum nature of hydrogen nucleus lowers the activation barrier of the reactions. The H/D isotope effect on F + (H2O)n→ FH + (H2O)n-1OH (n = 1-3) reactions was also investigated.
Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan.
Taro
T
Udagawa
Quantum Chemistry Division, Graduate School of Science, Yokohama City University, Seto 22-2, Kanazawa-ku, Yokohama 236-0027, Japan.
Masanori
M
Tachikawa