Steric and electronic effects in the host-guest hydrogen bonding in clathrate hydrates

Waldemar Kulig, Piotr Kubisiak, Lukasz Cwiklik

    Research output: Contribution to journalArticleScientificpeer-review

    19 Citations (Scopus)

    Abstract

    Clathrate hydrates with polar guest molecules (dimethyl ether, ethylene oxide, trimethylene oxide, tetrahydrofuran, and tetrahydropyran) were studied by means of the density functional theory. A model of a large cage of structure-I clathrate was employed. Optimal configurations of encaged guests were investigated with a focus on the host-guest hydrogen bond formation. Weak hydrogen bonds were found to be formed by each guest, while for THP a strong hydrogen bond and formation of L-defect was also observed. This is in accord with previous computational and experimental studies. Steric factors were shown to play a key role for the strength of the hydrogen bond formed. Interestingly, the host-guest binding is influenced not only by the size of a guest molecule but also by its shape. This work demonstrates that both electronic and steric properties of a polar guest should be considered for a full description of clathrate systems.

    Original languageEnglish
    Pages (from-to)6149-6154
    Number of pages6
    JournalJournal of Physical Chemistry A
    Volume115
    Issue number23
    DOIs
    Publication statusPublished - 16 Jun 2011
    Publication typeA1 Journal article-refereed

    ASJC Scopus subject areas

    • Physical and Theoretical Chemistry

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