Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 13, Issue 31, Pages 14050-14063Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1cp20182d
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Funding
- DFG [Su121/2, GRK 782]
- Danish Research Council
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The vibrational dynamics of vacuum-isolated hydrogen-bonded complexes between water and the two simplest alcohols is characterized at low temperatures by Raman and FTIR spectroscopy. Conformational preferences during adaptive aggregation, relative donor/acceptor strengths, weak secondary hydrogen bonding, tunneling processes in acceptor lone pair switching, and thermodynamic anomalies are elucidated. The ground state tunneling splitting of the methanol-water dimer is predicted to be larger than 2.5 cm(-1). Two types of alcohol-water trimers are identified from the spectra. It is shown that methanol and ethanol are better hydrogen bond donors than water, but even more so better hydrogen bond acceptors. As a consequence, hydrogen bond induced red shifts of OH modes behave non-linearly as a function of composition and the resulting cluster excess quantities correspond nicely to bulk excess enthalpies at room temperature. The effects of weak C-H center dot center dot center dot O hydrogen bonds are quantified in the case of mixed ethanol-water dimers.
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