Revisiting the formation of cyclic clusters in liquid ethanol

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    The liquid phase of ethanol in pure and in non-polar solvents was studied at room temperature using Fourier transform infrared (FT-IR) and 1H nuclear magnetic resonance (NMR) spectroscopies together with theoretical approach. The FT-IR spectra for pure ethanol and solution in cyclohexane at different dilution stages are consistent with 1H NMR results. The results from both methods were best explained by the results of the density functional theory based on a multimeric model. It is suggested that cyclic trimers and tetramers are dominated in the solution of cyclohexane/hexane with the concentration greater than 0.5M at room temperature. In liquid ethanol, while the primary components at room temperature are cyclic trimers and tetramers, there is a certain amount (∼14%) of open hydroxide group representing the existence of chain like structures in the equilibria. The cyclic cluster model in the liquid and concentrated solution phase (>0.5M) can be used to explain the anomalously lower freezing point of ethanol (159 K) than that of water (273 K) at ambient conditions. In addition, 1H NMR at various dilution stages reveals the dynamics for the formation of cyclic clusters.

    Original languageEnglish
    Article number154302
    JournalJournal of Chemical Physics
    Volume144
    Issue number15
    DOIs
    Publication statusPublished - Apr 21 2016

    Fingerprint

    ethyl alcohol
    Ethanol
    Liquids
    liquids
    trimers
    cyclohexane
    nuclear magnetic resonance
    Dilution
    dilution
    Fourier transforms
    room temperature
    Nuclear magnetic resonance
    Infrared radiation
    magnetic resonance spectroscopy
    Hexanes
    Freezing
    Temperature
    Nuclear magnetic resonance spectroscopy
    hydroxides
    melting points

    ASJC Scopus subject areas

    • Physics and Astronomy(all)
    • Physical and Theoretical Chemistry

    Cite this

    Revisiting the formation of cyclic clusters in liquid ethanol. / Balanay, Mannix P.; Kim, Dong Hee; Fan, Haiyan.

    In: Journal of Chemical Physics, Vol. 144, No. 15, 154302, 21.04.2016.

    Research output: Contribution to journalArticle

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