Hydrogen-bond equilibria and life times in a supercooled monohydroxy alcohol

Abstract

Dielectric loss spectra covering 13 decades in frequency were collected for 2-ethyl-1-hexanol, a monohydroxy alcohol that exhibits a prominent Debye-like relaxation, typical for several classes of hydrogen-bonded liquids. The thermal variation of the dielectric absorption amplitude agrees well with that of the hydrogen-bond equilibrium population, experimentally mapped out using near infrared (NIR) and nuclear magnetic resonance (NMR) measurements. Despite this agreement, temperature-jump NIR spectroscopy reveals that the hydrogen-bond switching rate does not define the frequency position of the prominent absorption peak. This contrasts with widespread notions and models based thereon, but is consistent with a recent approach.

4 pages, 4 figures

References in corpus (3)

• Glassy Aging Dynamics
• Nuclear magnetic resonance measurements reveal the origin of the Debye process in monohydroxy alcohols
• Investigation of the shear-mechanical and dielectric relaxation processes in two mono-alcohols close to the glass transition

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