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Proton distribution in KHCO3 from ab initio molecular dynamics simulation
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Structural Chemistry. (strukturkemi)
2009 (English)In: Chemical Physics Letters, ISSN 0009-2614, E-ISSN 1873-4448, Vol. 476, no 4-6, 223-226 p.Article in journal (Refereed) Published
Abstract [en]

The proton distribution in the (HCO3)22- dimer of KHCO3 at 298 K has been studied with the Car-Parrinello molecular dynamics (CPMD) and path integrals molecular dynamics (PIMD) simulations. According to earlier neutron studies hydrogen is disordered and occupies two positions with an occupancy ratio of 0.804/0.196. CPMD results with four cells reproduce experimental data with high accuracy. The occupancy ratio from the CPMD simulation after 35 ps run is 0.783/0.217. Present results support a mechanism for the disorder which involves proton transfer from donor to acceptor and not orientational disordering of the entire dimer. The question of simultaneous or successive proton transfer in the two hydrogen bonds in the dimer is ambiguous. In present CPMD simulations the observed time lag between proton transfers within one dimer was in the range of 1-20 fs.

Place, publisher, year, edition, pages
2009. Vol. 476, no 4-6, 223-226 p.
National Category
Chemical Sciences
Research subject
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-108427DOI: 10.1016/j.cplett.2009.06.048ISI: 000267762500021OAI: oai:DiVA.org:uu-108427DiVA: diva2:235824
Note
Department of Materials Chemistry, Ångström Laboratory, Box 538, SE-751 21 Uppsala, Sweden Available from: 2009-09-18 Created: 2009-09-18 Last updated: 2011-03-07Bibliographically approved

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