Study on hydrogen bonding network in aqueous methanol solution by Raman spectroscopy

Yang, Bo; Cao, Xiaoyue; Lang, Hongzhi; Wang, Shenghan; Sun, Chia‐Chung

doi:10.1016/j.saa.2019.117488

Cited by 33 publications

(10 citation statements)

References 34 publications

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“…In the Raman spectrum of pure MeOH, the characteristic stretching vibration peak of C-O is at 1034 cm -1 and the characteristic stretching vibration peak of C-H is at 1450 cm -1 (Figure 8f). These are in accordance with previous literature reports 49 . In the Raman spectra of the 50 mL, 25 mL, 5 mL, and 3 mL sample solutions, the characteristic absorption peaks of MeOH have not shifted significantly, but the intensity of the absorption peaks is gradually weakening (Figure 8b-e).…”

Section: Solvent-state Raman Spectroscopic Analysissupporting

confidence: 94%

Exploring the Formation Mechanism of Coamorphous Andrographolide-Oxymatrine Based on Molecular Dynamics and Spectroscopy

Fang

Huang

et al. 2022

Journal of Pharmaceutical Sciences

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Section: Solvent-state Raman Spectroscopic Analysissupporting

confidence: 94%

Exploring the Formation Mechanism of Coamorphous Andrographolide-Oxymatrine Based on Molecular Dynamics and Spectroscopy

Fang

Huang

et al. 2022

Journal of Pharmaceutical Sciences

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“…The absorption peak at 3341 cm −1 corresponding to a O-H stretching vibration is possibly due to the existence of adsorbed water from the atmosphere [49].…”

Section: Resultsmentioning

confidence: 99%

Facile synthesis of high-entropy zirconate nanopowders and their sintering behaviors

Tan¹,

Su²,

Yang³

et al. 2023

Journal of Advanced Ceramics

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The challenge in synthesizing high-entropy ceramic (HEC) nanopowders is to suppress severe grain coarsening and particle agglomeration, which occur at elevated temperatures. This challenge could be addressed by the polyacrylamide gel method. In this work, single-phase high-entropy (La 0.2 Nd 0.2 Sm 0.2 Gd 0.2 Yb 0.2 ) 2 Zr 2 O 7 and (La 0.2 Nd 0.2 Y 0.2 Eu 0.2 Gd 0.2 ) 2 Zr 2 O 7 nanopowders without agglomeration were successfully synthesized using the polyacrylamide gel method for the first time. The results showed that phase composition, particle size, and agglomeration degree of the nanopowders were greatly influenced by the molar ratio of acrylamide (AM)/Zr and calcination temperature. These as-synthesized high-entropy zirconate (HEZ) nanopowders could be sintered into fully dense ceramics at 1500 ℃ for 2 h. These HEZ nanopowders showed a phase transformation from a defect-fluorite phase to a pyrochlore phase with the increase of sintering temperature. Additionally, two-step sintering of these nanopowders was conducted, and the HEZ ceramics with fine grains were prepared. The polyacrylamide gel method is simple and easily operated, which is a facile approach of producing the HEC nanopowders with excellent sinterability.

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“…The spectral decomposition of pure water shows that the Raman peak is resolved into two broad overlapping O–H features at 3241 and 3456 cm –1 (Figure b), representing the strong and weak H-bond structures of water, respectively. − The Raman peak at 3627 cm –1 is considered to be the free O–H of water. Except for pure water, the Raman spectrum does not reveal the characteristic peak of free O–H, which is different from other alcohols, such as methanol . Experimental studies by near-infrared spectroscopy also demonstrated the absence of free O–H in the EG or propanediol solution, suggesting that the state of water in the EG is special …”

mentioning

confidence: 86%

“…Except for pure water, the Raman spectrum does not reveal the characteristic peak of free O−H, which is different from other alcohols, such as methanol. 17 Experimental studies by nearinfrared spectroscopy also demonstrated the absence of free O−H in the EG or propanediol solution, suggesting that the state of water in the EG is special. 18 In the diluted EG solution (1:28 mol ratio), a small amount of EG induced a red shift (∼15 cm −1 ) in the strong and weak H-bond structures of water, which could be caused by a stronger H-bond network of water.…”

mentioning

confidence: 99%

Hydrogen-Bond Dynamics and Water Structure in Aqueous Ethylene Glycol Solution via Two-Dimensional Raman Correlation Spectroscopy

Yang

Ren

et al. 2023

J. Phys. Chem. Lett.

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The hydrogen-bond (H-bond) dynamics and water structural transitions in aqueous ethylene glycol (EG) solution were investigated on the basis of concentration- and temperature-dependent two-dimensional Raman correlation spectroscopy (2D Raman-COS). At room temperature, EG-induced enhancement of the water structure when the EG/water molar ratio is less than 1:28 resulted from the hydrophobic effect around the methylene groups of EG. The decrease in the temperature caused an enhancement of the Raman peak at about 3200 cm–1, representing an increase in the orderliness of water molecules. Further analysis of the water-specific structures by 2D Raman-COS reveals that the strong H-bond structure preferentially responds to external perturbations and induces a weak H-bond structural transition in water. Finally, EG-induced water structural transitions were calculated by the density functional theory (DFT). Hopefully, 2D Raman-COS combined with DFT calculations would advance the study of solute-induced water structural transitions in water–organic chemistry.

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Study on hydrogen bonding network in aqueous methanol solution by Raman spectroscopy

Cited by 33 publications

References 34 publications

Exploring the Formation Mechanism of Coamorphous Andrographolide-Oxymatrine Based on Molecular Dynamics and Spectroscopy

Exploring the Formation Mechanism of Coamorphous Andrographolide-Oxymatrine Based on Molecular Dynamics and Spectroscopy

Facile synthesis of high-entropy zirconate nanopowders and their sintering behaviors

Hydrogen-Bond Dynamics and Water Structure in Aqueous Ethylene Glycol Solution via Two-Dimensional Raman Correlation Spectroscopy

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