Hydrogen bonding in aqueous ethanol solutions studied by Raman spectroscopy

Dolenko, Tatiana A.; Burikov, Sergey; Hojo, Masashi; Patsaeva, Svetlana V.; Yuzhakov, V. I.

doi:10.1117/12.871101

Cited by 5 publications

(4 citation statements)

References 22 publications

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“…44 Moreover, the variation in the ratio of the intensity of low-frequency band to the intensity of highfrequency band (I 3240 /I 3400 ) reflects the change in the relative proportion between the strong and the weak hydrogen bonds formed in the solvent mixtures. 44,45 In Figure 5a, the ratio of I 3240 /I 3400 at x of 5% increases following the series MeOH < EtOH < 1-PrOH < 2-PrOH. As reported previously, the hydrophobic hydration of the hydrocarbon group of alcohols is achieved by forming stable clathrate structure via strong hydrogen bonds.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

“…It is known that the low-frequency band (∼3240 cm –1 ) and the high-frequency band (∼3400 cm –1 ) in the Raman spectra are respectively ascribed to the hydroxyl groups in strong and weak hydrogen bond networks in water–alcohol mixtures . Moreover, the variation in the ratio of the intensity of low-frequency band to the intensity of high-frequency band ( I 3240 / I 3400 ) reflects the change in the relative proportion between the strong and the weak hydrogen bonds formed in the solvent mixtures. , …”

Section: Resultsmentioning

confidence: 99%

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Amplification of Hofmeister Effect by Alcohols

2014

J. Phys. Chem. B

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We have demonstrated that Hofmeister effect can be amplified by adding alcohols to aqueous solutions. The lower critical solution temperature behavior of poly(N-isopropylacrylamide) has been employed as the model system to study the amplification of Hofmeister effect. The alcohols can more effectively amplify the Hofmeister effect following the series methanol < ethanol < 1-propanol < 2-propanol for the monohydric alcohols and following the series d-sorbitol ≈ xylitol ≈ meso-erythritol < glycerol < ethylene glycol < methanol for the polyhydric alcohols. Our study reveals that the relative extent of amplification of Hofmeister effect is determined by the stability of the water/alcohol complex, which is strongly dependent on the chemical structure of alcohols. The more stable solvent complex formed via stronger hydrogen bonds can more effectively differentiate the anions through the anion-solvent complex interactions, resulting in a stronger amplification of Hofmeister effect. This study provides an alternative method to tune the relative strength of Hofmeister effect besides salt concentration.

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Section: ■ Results and Discussionmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Amplification of Hofmeister Effect by Alcohols

2014

J. Phys. Chem. B

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“…Later, in accordance with the hydration of salt ions dissolved in water, the term “hydrophobic hydration” was common − in order to describe the development of “hydrate-like” or “ice-like” formations of water molecules . This concept was confirmed ,− but also challenged − by experimental and theoretical investigations. However, the formation of water molecules in these mixtures is under discussion.…”

Section: Introductionmentioning

confidence: 99%

“…Raman spectroscopy is an alternative and also frequently applied technique for the investigation of the HBN. ,,,,− In 2012, Lin et al evaluated polarized Raman spectra from different water/alcohol mixtures (methanol, ethanol, 1-propanol, and n -propanol) over the whole composition range . The stronger the intermolecular interactions are, the slower the translational motions that can be deduced from the Raman spectra.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Bond Networks in Binary Mixtures of Water and Organic Solvents

Stehle

Braeuer

2019

J. Phys. Chem. B

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We here present an approach for the optical in situ characterization of hydrogen bond networks (HBNs) in binary mixtures of water and organic solvents (OSs), such as methanol, ethanol, and acetonitrile. HBNs are characterized based on (i) the analysis of experimental molar Raman spectra of the mixture, (ii) partial molar Raman spectra of the mixture constituents, and (iii) computed ideal molar Raman spectra of the mixture. Especially, the consideration of the partial molar Raman spectra provides insights into the development of hydrogen bonds of molecules of one species with their neighbors. The obtained Raman spectra are evaluated with respect to the centroid of the symmetric stretching vibration Raman signal of water and to the hydroxyl stretching vibration of alcohols. We show the influence of composition and temperature on the development of the HBN of the mixtures, the HBN of water, and the HBN of the OS molecules.

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