Ions with a strong symmetric H-bond in solutions of sodium acetate in acetic acid

Maiorov, V. D.; Burdin, V. V.; Voloshenko, G. I.; Librovich, N. B.

doi:10.1007/bf01431823

Cited by 6 publications

(8 citation statements)

References 3 publications

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“…From this result, it can be confirmed that PVP was almost completely removed by the washing process. Finally, the peak at 1412 nm could be attributed to sodium acetate, which was used as a solvent 45 .…”

Section: Resultsmentioning

confidence: 99%

Native collagen hydrogel nanofibres with anisotropic structure using core-shell electrospinning

Wakuda

Nishimoto

Suye

et al. 2018

Sci Rep

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Collagen hydrogel is a popular extracellular matrix (ECM) material in regenerative medicine and has an isotropic structure. In contrast, native ECM has an anisotropic structure. Electrospinning of collagen dissolved in organic solvents is widely used for fabricating anisotropic collagen nanofibres; however, such fibres are water-soluble and require cross-linking before use as scaffolds for cell culture. Herein, electrospinning using a core-shell nozzle was employed to spin an aqueous acidic solution of collagen and encapsulate it within a shell of polyvinylpyrrolidone (PVP). Subsequently, the core collagen was gelled, and the shell PVP was washed away using a basic ethanol solution to yield anisotropic collagen hydrogel nanofibres. Immunostaining and Fourier transform infrared spectroscopy revealed that the obtained fibres were composed of collagen, and surface PVP was removed completely. Circular dichroism measurements confirmed that the fibres exhibited the triple helical structure characteristic of collagen. Human umbilical vein endothelial cells cultured on the collagen hydrogel fibres were oriented along the fibre direction. Hence, this method is suitable for fabricating fibrous anisotropic collagen hydrogels without chemical and thermal cross-linking, and can facilitate the development of safe medical materials with anisotropy similar to that of native ECM.

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Section: Resultsmentioning

confidence: 99%

Native collagen hydrogel nanofibres with anisotropic structure using core-shell electrospinning

Wakuda

Nishimoto

Suye

et al. 2018

Sci Rep

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“…The 3700−1800 cm -1 region is dominated by four weak broad bands situated at 3500, 2930, 2580, and 1995 cm -1 (Figure ). Because of its continuous formation, this diffuse absorption is sometimes referred to as the “continuum of absorbance”. − However, this absorption is associated with the presence of water for two reasons: no H 3 O + is present in the solution, and the absorption in the 3700−1800 cm -1 region is much more intense than in solid malic acid where there is no water (Figure d,d‘). The second derivative technique allowed us to see three very weak bands situated at 2940, 2895, and possibly one at 2840 cm -1 , which we assign to CH 2 antisymmetric and symmetric and CH stretch bands.…”

Section: Resultsmentioning

confidence: 99%

Infrared Spectroscopy of Aqueous Carboxylic Acids: Malic Acid

Ma×

Chapados

2002

J. Phys. Chem. A

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Quantitative infrared (IR) titration of 1.80 M malic acid is presented where factor analysis (FA) was used to obtain the principal species' spectra and their abundances. Three malic species and three water species were obtained. The distribution of the species as a function of pH was made from which their pK a values were determined. The experimental points of the distribution curves correspond to the values calculated from the thermodynamic equilibrium equations. A precise determination of aqueous malic IR bands was obtained from the real spectra of the malic species. The hydrates' hydration numbers were determined to be 2.0 ± 1.0, 3.0 ± 2.0, and 4.0 ± 0.5 for malic acid, mono-, and disodium malate, respectively. The hydrates are stable throughout the pH range where the species are present. The double and single CO stretch bands of malic acid are situated at 1719 and 1272 cm-1, respectively. The antisymmetric and symmetric CO stretch bands of mono- and disodium malate are situated at 1580, 1400 cm-1 and 1563, 1395 cm-1, respectively. Malic acid shows four very broad bands in the 3800−1800 cm-1 region as a continuous absorption assigned to the OH stretch of hydrogen bonded water and alcoholic groups to carboxylic groups. The 2930 and 2580 cm-1 bands, which are far from the 3500 cm-1 band, indicate strong hydrogen bonds. Disodium malate shows one large band at 3320 cm-1 assigned to the OH stretch of solvated water and alcoholic groups. Monosodium malate has the bands of both malic and disodium malate slightly displaced, but with half their intensities.

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“…The B-term, or the v-v coupling is the most likely origin of the low-frequency coherence. In this process, there are lowfrequency modes that couple the COO asymmetric stretching mode with another intramolecular mode, s. Eqn (7) indicates that the coherence between the initial ground state and the s mode is generated by the low-frequency vibrational coordinate operator, Q a , when the IR pump pulse, which is resonant with the COO asymmetric stretching mode, irradiates the sample. Subsequently, the excitation reaches the low-frequency excited state in the COO stretching mode ground state through the second interaction with the pump pulse (Fig.…”

Section: Low-frequency Component In the Ir Pump-probe Signalmentioning

confidence: 99%

“…The carboxylate anion and the solvent molecules interact strongly, which can affect reaction mechanisms. The solvation structures and anion-cation interactions of carboxylate salts have been extensively studied by steady-state infrared (IR) spectroscopy [2][3][4][5][6][7][8][9] and theoretical calculations based on density functional theory (DFT). [10][11][12][13] These studies suggest that the carboxylate anion forms hydrogen-bonded complexes with the solvent, although the static and dynamic hydrogen bonding interactions are not yet fully understood.…”

Section: Introductionmentioning

confidence: 99%

Vibrational dynamics of acetate in D2O studied by infrared pump–probe spectroscopy

Banno

Ohta

Tominaga

2012

Phys. Chem. Chem. Phys.

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Solute-solvent interactions between acetate and D(2)O were investigated by vibrational spectroscopic methods. The vibrational dynamics of the COO asymmetric stretching mode in D(2)O was observed by time-resolved infrared (IR) pump-probe spectroscopy. The pump-probe signal contained both decay and oscillatory components. The time dependence of the decay component could be explained by a double exponential function with time constants of 200 fs and 2.6 ps, which are the same for both the COO asymmetric and symmetric stretching modes. The Fourier spectrum of the oscillatory component contained a band around 80 cm(-1), which suggests that the COO asymmetric stretching mode couples to a low-frequency vibrational mode with a wavenumber of 80 cm(-1). Based on quantum chemistry calculations, we propose that a bridged complex comprising an acetate ion and one D(2)O molecule, in which the two oxygen atoms in the acetate anion form hydrogen bonds with the two deuterium atoms in D(2)O, is the most stable structure. The 80 cm(-1) low-frequency mode was assigned to the asymmetric stretching vibration of the hydrogen bond in the bridged complex.

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Ions with a strong symmetric H-bond in solutions of sodium acetate in acetic acid

Cited by 6 publications

References 3 publications

Native collagen hydrogel nanofibres with anisotropic structure using core-shell electrospinning

Native collagen hydrogel nanofibres with anisotropic structure using core-shell electrospinning

Infrared Spectroscopy of Aqueous Carboxylic Acids: Malic Acid

Vibrational dynamics of acetate in D2O studied by infrared pump–probe spectroscopy

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