Pressure and temperature dependence of hydrogen-bond strength in methanol clusters

Using 1 H NMR spectroscopy, the hydroxyl proton chemical shift δ of methanol solved in carbon tetrachloride at methanol mole fractions ranging from 0.01 to 0.20 was measured at 20°C and 40°C under pressures up to 2000 bar. On the basis of a simple monomer–tetramer equilibrium for methanol molecules,...

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Bibliographic Details
Published in:Chemical physics letters 1999-03, Vol.302 (5), p.633-638
Main Authors: Czeslik, Claus, Jonas, Jiri
Format: Article
Language:English
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Summary:Using 1 H NMR spectroscopy, the hydroxyl proton chemical shift δ of methanol solved in carbon tetrachloride at methanol mole fractions ranging from 0.01 to 0.20 was measured at 20°C and 40°C under pressures up to 2000 bar. On the basis of a simple monomer–tetramer equilibrium for methanol molecules, it was possible to separate the effects of hydrogen-bond strength and extent on the chemical shift δ. Analyzing the pressure and temperature dependence of the chemical shift of tetramer methanol clusters, a pressure-induced strengthening and a temperature-induced weakening of hydrogen bonds in clusters of methanol molecules is found.
ISSN:0009-2614
1873-4448
DOI:10.1016/S0009-2614(99)00170-0