Infrared spectroscopic studies of hydrogen-bonded complexes of water with oxygen bases. III. The HOH-bending region of the spectra of water molecules dissolved in some ketones and ethers

Paul, S.O.; Ford, T.A.

doi:10.1007/bf01188187

Cited by 13 publications

(10 citation statements)

References 13 publications

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“…Consequently, the spectra of the ν 2 band for the water molecules in organic solvents have been the subject of a number of investigations. 8 In the present work, we measured FT-IR spectra of aqueous haloethanol mixtures to verify the conclusions of the previous 1 H-and 17 O-NMR studies of the same mixtures.…”

Section: Introductionsupporting

confidence: 69%

“…However, one ν 2 band is assigned strictly to one distinct species of water molecules present in solution, in contrast with the presence of two stretching bands. 8 Thus, the number of observed ν 2 bands should provide the number of water species with different hydrogen-bonding strengths. Consequently, the spectra of the ν 2 band for the water molecules in organic solvents have been the subject of a number of investigations.…”

Section: Introductionmentioning

confidence: 99%

“…The frequency shifts of the ν 2 band are much smaller than those of the stretching bands. However, one ν 2 band is assigned strictly to one distinct species of water molecules present in solution, in contrast with the presence of two stretching bands . Thus, the number of observed ν 2 bands should provide the number of water species with different hydrogen-bonding strengths.…”

Section: Introductionmentioning

confidence: 99%

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IR Study of Hydrogen Bonds in Halogenoalcohol−Water Mixtures

Mizuno¹,

Mabuchi²,

Miyagawa³

et al. 1997

J. Phys. Chem. A

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The IR bending vibrational (ν2) band of the water molecules in aqueous haloethanol (XCH2CH2OH; X = Cl, Br, I) mixtures has been studied, and the haloethanols are found to give rise to red shifts of the ν2 band. Since the frequency of the ν2 band is reciprocally proportional to the hydrogen-bonding strength of water molecules, the results lead us to a conclusion that a breakdown of water structure occurs in the mixtures. The red shifts occur gradually in the whole range of the haloethanol concentrations, showing gradual breakdown of the water structure with an increase in the alcohol concentration. The effect of the alcohols on the red shift is found to be in the order ClCH2CH2OH < BrCH2CH2OH < ICH2CH2OH. The red shifts are discussed in comparison with the blue shifts of the ν2 band previously observed for the aqueous ethanol mixtures. The conclusion is consistent with that of the 1H-NMR studies of the same mixtures in which the water structure is discussed in terms of the chemical shift of the water proton.

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Section: Introductionsupporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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IR Study of Hydrogen Bonds in Halogenoalcohol−Water Mixtures

Mizuno¹,

Mabuchi²,

Miyagawa³

et al. 1997

J. Phys. Chem. A

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“…One δ(OH) band is assigned strictly to one distinct species of water molecules present in the investigated water/polymer system. 38 And in the PP/water system, S-PP has no absorption bands in the region of the bending band of water so that the IR spectra in the bending band region are available. (Figure 2) Thus, the water bending mode is an even better alternative (compared to the relatively complicated stretching mode) to differentiate the species of water molecules in this mixed system.…”

Section: Introductionmentioning

confidence: 99%

“…One δ(OH) band is assigned strictly to one distinct species of water molecules present in the investigated water/polymer system . And in the PP/water system, S-PP has no absorption bands in the region of the bending band of water so that the IR spectra in the bending band region are available.…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional ATR−FTIR Spectroscopic Investigation on Water Diffusion in Polypropylene Film: Water Bending Vibration

Shen

2003

J. Phys. Chem. B

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Two-dimensional (2D) correlation ATR-FTIR spectroscopy was used to study the dynamic diffusion behavior and state of water in syndiotactic polypropylene (S-PP). The 2D asynchronous spectra of water bending band clearly reveal that there are three separate bands in the 1800-1500 cm -1 region. These three bands at 1676, 1645, and 1592 cm -1 are assigned, respectively, to the aggregated water with strong hydrogen bond, the aggregated water with moderate strong hydrogen bond, and the "free water". On the basis of this approach, the following mechanism for the diffusion process of water in S-PP has been proposed: the aggregated water molecules first diffuse into the polymer during the diffusion process. The water molecules with strong hydrogen bond will diffuse slower than water with moderate strong hydrogen bond because of their large size. In the late stage of the diffusion process, some aggregated water molecules in the PP matrix are forced to dissolve into the "free water" form.

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Molecular Engineering of Cation Solvation Structure for Highly Selective Carbon Dioxide Electroreduction

Ni,

Guan,

Chen

et al. 2023

Angewandte Chemie

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Balancing the activation of H2O is crucial for highly selective CO2 electroreduction (CO2RR), as the protonation steps of CO2RR require fast H2O dissociation kinetics, while suppressing hydrogen evolution (HER) demands slow H2O reduction. We herein proposed one molecular engineering strategy to regulate the H2O activation using aprotic organic small molecules with high Gutmann donor number as a solvation shell regulator. These organic molecules occupy the first solvation shell of K+ and accumulate in the electrical double layer, decreasing the H2O density at the interface and the relative content of proton suppliers (free and coordinated H2O), suppressing the HER. The adsorbed H2O was stabilized via the second sphere effect and its dissociation was promoted by weakening the O−H bond, which accelerates the subsequent *CO2 protonation kinetics and reduces the energy barrier. In the model electrolyte containing 5 M dimethyl sulfoxide (DMSO) as an additive (KCl‐DMSO‐5), the highest CO selectivity over Ag foil increased to 99.2 %, with FECO higher than 90.0 % within −0.75 to −1.15 V (vs. RHE). This molecular engineering strategy for cation solvation shell can be extended to other metal electrodes, such as Zn and Sn, and organic molecules like N,N‐dimethylformamide.

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Infrared spectroscopic studies of hydrogen-bonded complexes of water with oxygen bases. III. The HOH-bending region of the spectra of water molecules dissolved in some ketones and ethers

Cited by 13 publications

References 13 publications

IR Study of Hydrogen Bonds in Halogenoalcohol−Water Mixtures

IR Study of Hydrogen Bonds in Halogenoalcohol−Water Mixtures

Two-Dimensional ATR−FTIR Spectroscopic Investigation on Water Diffusion in Polypropylene Film: Water Bending Vibration

Molecular Engineering of Cation Solvation Structure for Highly Selective Carbon Dioxide Electroreduction

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