Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/18252
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Title

DFT Research on the Dehydroxylation Reaction of Pyrophyllite 2. Characterization of Reactants, Intermediates, And Transition States along the Reaction Path.

AuthorsMolina-Montes, Esther; Donadio, Davide; Hernández-Laguna, Alfonso; Sainz-Díaz, C. Ignacio
Issue Date19-Jun-2008
PublisherAmerican Chemical Society
CitationJournal of Physical Chemistry A 112(28): 6373-6383 (2008)
AbstractWe delineate the dehydroxylation reaction of pyrophyllite in detail by localizing the complete reaction path on the free energy surface obtained previously by Car−Parrinello molecular dynamics and the implemented metadynamics algorithm (Molina-Montes et al. J. Phys. Chem. B2008, 112, 7051). All intermediates were identified, and a transition state search was also undertaken with the PRFO algorithm. The characterization of this reaction and the atomic rearrangement in the intermediates and products at quantum mechanical level were performed for the two reaction paths found previously: (i) direct dehydroxylation through the octahedral hole (cross mechanism) or between contiguous hydroxyl groups (on-site mechanism) and (ii) two-step dehydroxylation assisted by apical oxygens for each of the two steps. New intermediates were found and determined structurally. The structural variations found for all intermediates and transition states are in agreement with experimental results. The formation of these structures indicates that the dehydroxylation process is much more complex than a first-order reaction and can explain the wide range of temperatures for completing the reaction, and these results can be extrapolated to the dehydroxylation of other dioctahedral 2:1 phyllosilicates.
Description11 pages, 7 figures, 4 tables.
Publisher version (URL)http://dx.doi.org/10.1021/jp8010876
URIhttp://hdl.handle.net/10261/18252
DOI10.1021/jp8010876
ISSN1089-5639
Appears in Collections:(IACT) Artículos

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