Compression of selected glymes in N,N-dimethylformamide + water. The hydration numbers and hydrophobic hydration process of glymes

Jóźwiak, Małgorzata; Burakowski, Andrzej; Tyczyńska, Magdalena; Komudzińska, Marlena

doi:10.1016/j.molliq.2022.119722

Cited by 3 publications

(9 citation statements)

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“…This is probably related to the characteristic structure of the DMF + W mixture in this range of mixture composition. A similar situation was observed for the DMF + W systems containing shorter glyme chains [ 22 ].…”

Section: Resultssupporting

confidence: 79%

“…As seen in Table 6 and Table 7 , the standard partial molar compression of pentaglyme and hexaglyme in the DMF + W mixed solvent increases with increasing temperature, similar to that in the case of glymes with shorter chains [ 22 ].…”

Section: Resultsmentioning

confidence: 91%

“…The higher the water content in the mixture, the more clearly the process of the hydrophobic hydration of glymes, which have a hydrophobic character, is observed. This stiffens the structure of the system and thus reduces the compressibility [ 22 , 29 ].…”

Section: Resultsmentioning

confidence: 99%

“…The hydration numbers of the investigated glyme molecules were calculated as described in our previous paper [ 22 ] and are presented in Table 8 and Figure 9 as a function of the number of oxygen atoms (

) in the glyme’s molecule.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, using the data resulting from the density and speed of sound propagation in the DMF + W mixtures containing glymes with shorter chains [ 21 , 22 ], the –CH 2 – and –O– groups’ contribution to the functions derived from the density and speed-of-sound measurements were calculated.…”

Section: Introductionmentioning

confidence: 99%

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The Group Contribution to the Function Derived from Density and Speed-of-Sound Measurements for Glymes in N,N-Dimethylformamide + Water Mixtures

2023

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The density and speed of sound of pentaglyme and hexaglyme in the N,N-dimethylformamide + water mixture at four temperatures are presented. The limiting apparent molar volumes (VΦ,m0=Vm0), the isobaric molar thermal expansion (Ep,m0), the isentropic compressibility (κS), and the limiting partial molar isentropic compression (KS,Φ,m0 = KS,m0) were calculated. Changes in the values obtained from the physicochemical parameters, as functions of composition and temperature, were analyzed in terms of the molecular interactions and structural differentiation of the investigated systems. The hydrophobic hydration process of the studied glymes was visible in the area of high water content in the mixture. The hydration number of glymes in water at four temperatures was calculated and analyzed. The contribution of the –CH2– and –O– group to the functions describing the volume and acoustic properties of the investigated system was calculated. The calculated values of the functions analyzed using the group contribution are in agreement with the values obtained from the experimental data. Thus, such contributions are valuable for wide ranges of data, which can be used to analyze the hydrophobic hydration and preferential solvation processes, as well as to calculate the values of these functions for other similar compounds.

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Section: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 91%