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Title: A study of O-H···O hydrogen bonds along various isolines in 2-ethyl-1- hexanol. Temperature or pressure - which parameter controls their behavior?
Authors: Hachuła, Barbara
Kamińska, Ewa
Koperwas, Kajetan
Wrzalik, Roman
Jurkiewicz, Karolina
Tarnacka, Magdalena
Scelta, Demetrio
Fanetti, Samuele
Pawlus, Sebastian
Paluch, Marian
Kamiński, Kamil
Keywords: Hydrogen bond; Temperature; Pressure; Isolines; Intramolecular dynamics
Issue Date: 2022
Citation: "Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy" (2022), Pre-proofs
Abstract: The nature of hydrogen bond (HB) interactions is still far from being understood despite intense experimental and theoretical studies on this subject carried out by the leading research centers. In this paper, by a combination of unique high-pressure infrared, dielectric and volumetric data, the intramolecular dynamics of hydroxyl moieties (which provides direct information about Hbonds) was studied along various isolines, i.e., isotherms, isobars, isochrones, and isochores, in a simple monohydroxy alcohol (2-ethyl-1-hexanol). This allowed us to discover that the temperature controls the intermolecular hydrogen bonds, which then affect the intramolecular dynamics of O-H units. Although the role of density fluctuations gets stronger as temperature rises. We also demonstrated a clear connection between the intra- and intermolecular dynamics of the associating liquid at high pressure. The data reported herein open a new perspective to explore this important aspect of the glass transition phenomenon and understand H-bonding interactions at varying thermodynamic conditions.
DOI: 10.1016/j.saa.2022.121726
ISSN: 1386-1425
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