Water/Alcohol Mixtures:  A Spectroscopic Study of the Water-Saturated 1-Octanol Solution

Abstract

The properties of the water-saturated 1-octanol solution in the 10−75 °C temperature range have been investigated by means of different scattering spectroscopies. The results of Raman, depolarized-Rayleigh, and Rayleigh−Brillouin experiments have been compared to the corresponding results recently obtained for the pure alcohol in our laboratory. Spectroscopic findings obtained for the temperature behavior of vibrational, rotational, and translational degrees of freedom are analyzed according to a single, unifying picture of this liquid system. Differences and analogies between pure and water-saturated 1-octanol suggest the key for interpreting the structural properties connected to the amphiphilic nature of n-alcohols. In a wider perspective, the same arguments can be applied to the study of larger and more complicated systems such as phospholipids for which 1-octanol represents a simple model.

A study of collective motions in liquid tert‐butanol from low‐wavenumber Raman scattering

“…A similar scenario, showing the confinement of water in pockets distributed among alkylic chains, has been previously depicted in the case of other aliphatic alcohols. [3] It has also been suggested that the incomplete mixing of water and alcohol at the molecular level, accompanied by the retention of the characteristic water structuring, may explain the thermodynamic anomalies of these solutions. [45] According to this interpretation, we can affirm that the addition of water to liquid TBA has no significant effect in perturbing the alcohol H-bonding network.…”

“…With respect to this description, aliphatic alcohols can be referred to as simple models of biological systems, the latter being much more difficult to handle. [3] tert-Butyl alcohol (TBA), in particular, is an interesting system because of its full miscibility in water and its very large alkylic portion. [4,5] Even though the collective properties of this liquid alcohol, both pure and in solution, have been studied by a number of experimental [6 -12] and theoretical [1,2,13 -18] approaches, a complete and definitive characterization is still lacking.…”

Hydration properties and water structure in aqueous solutions of native and modified cyclodextrins by UV Raman and Brillouin scattering

“…To gain quantitative information on the H-bond molecular organization, a fit procedure based on the use of three components has been carried out to reproduce the OH stretching band. [41][42][43] One mixed 50% Gaussian-50% Lorentzian and two Gaussian profiles have been used, respectively, for the lower wavenumber component (associated to tetrahedrally coordinated water molecules) and the two higher wavenumber components (associated to molecules involved in distorted H-bonds and to free OH oscillators). The width of the three components has been constrained to that obtained for pure water.…”

Simultaneous determination of the composition and temperature gradients in the vicinity of boiling bubbles in liquid binary mixtures using one‐dimensional Raman measurements

“…In liquid mixtures or droplets, either composition14 or temperature,15–17 or both simultaneously18 have been measured successfully. The temperature‐sensitive signature of the OH vibrational band between 3100 and 3700 cm −1 was studied intensively for water19–22 and other multi‐component liquid systems 23. This paper focuses on the simultaneous measurement of composition and temperature gradients in the vicinity of boiling bubbles in binary mixtures.…”