Measurement and correlation of excess molar enthalpy for (1,2-propanediol, or 1,3-propanediol, or 1,4-butanediol+water) at the temperatures (298.15, 323.15, and 343.15) K

Microstructure variations with concentration of propylene glycol–water solution probed by NMR

“…When alcohol is mixed with water, the excess molar enthalpy of the system [10,19] all show anomalous behavior, it decrease more negatively than expected for an ideal solution. This well known effect has been attributed to hydrophobic headgroups creating 'iceberg' or clathrate-like structures in the surrounding water [20,21].…”

“…The thermodynamic studies for PG-water mixtures show that the excess molar volume [9] has deeper negative value than those of glycol and 1,2-butanediol and the minimum value of excess molar enthalpy [10] appears at lower concentration of PG than those of 1,3-propanediol and 1,4-butanediol. Based on 17 O NMR spectroscopy of water in the solution, Klein and Pacheco [11] suggested that the CH 3 CH(OH)-group enhanced water network by weak C-HÁ Á ÁO interactions.…”

Structural and interactional studies of homologous series of α,ω-alkanediols in N,N-dimethylformamide

“…Alkanediols are the simplest model structural units for polyhydroxy compounds. Alkanediols are chemically very similar to alcohols and the hydration properties have been observed for these compounds by several authors [2,3,[7][8][9][10][11]. The presence of the additional hydroxyl group in the diol molecule makes the position of the twohydroxyl groups very important for the hydrophobic hydration.…”

Experimental study of the excess molar volume of ternary mixtures containing {water+(1,2-propanediol, or 1,3-propanediol, or 1,2-butanediol, or 1,3-butanediol, or 1,4-butanediol, or 2,3-butanediol)+electrolytes} at a temperature of 298.15K and atmospheric pressure

“…According to Checoni and Francesconi [5] the dissolution of alkanediols in aqueous solutions is accompanied by structural enhancement of solution promoted by two kinds of effects: hydrophilic effects, which is the hydrogen bonding among water and hydroxyl groups and hydrophobic effects, which is related to the hydrogen bonding between water molecules, forming a cluster around the non polar surface of a mono alcohol molecule [16]. As a consequence, V E m curves have an unsymmetrical format at the hydroxyl compound dilute region.…”