Articles you may be interested inCommunication: The highest frequency hydrogen bond vibration and an experimental value for the dissociation energy of formic acid dimer J. Chem. Phys. 136, 151101 (2012); 10.1063/1.4704827 Association structures of ionic liquid/DMSO mixtures studied by high-pressure infrared spectroscopy J. Chem. Phys. 134, 044506 (2011); 10.1063/1.3526485 Infrared spectroscopy of methanol-hexane liquid mixtures. II. The strength of hydrogen bonding Infrared cavity ringdown spectroscopy of methanol clusters: Single donor hydrogen bondingWe report the first Fourier transform infrared spectroscopic studies of the hydrogen-bonding interactions in supercritical methanol and methanol/methanol-d1 mixtures. At 523 K and below ϳ0.3 mol/l, methanol chiefly existed in a monomeric form. However, at 523 K and between ϳ0.3 and 2 mol/l, in the regions of O-H, C-O, and C-H stretching vibrations, there were clear indications of methanol monomer-dimer equilibrium. The effect of temperature on the equilibrium constant was also investigated. As a result, the partial molar volume difference and enthalpy of the dimerization were estimated and correlated with the behavior of the methanol isothermal compressibility. It was also concluded that at 523 K and density higher than ϳ15 mol/l, the hydrogen-bonding equilibrium started to shift toward larger aggregates.
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