Diffraction Pattern and Structure of the System Tetra-<i>n</i>-butylammonium Fluoride–Water at 25°C

Narten, A. H.; Lindenbaum, Siegfried

doi:10.1063/1.1672110

Cited by 51 publications

(7 citation statements)

References 6 publications

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“…A tentative structure for the water surrounding the (C 4 H 9 )4N+ ion in aqueous solutions of (C4H9)4NF has been inferred from x-ray scattering data. 24 Relation of Raman Spectra to Acid Strength Raman and infrared spectra obtained in this work from HDO-H20 solutions containing polyatomic anions provide evidence that appears to be related in qualita-…”

Section: The Cation (C 4 H 9 ) 4~y+mentioning

confidence: 88%

Raman Spectral Studies of the Effects of Solutes and Pressure on Water Structure

Walrafen¹

1971

The Journal of Chemical Physics

163

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to 171.67.34.69. Redistribution subject to AIP license or copyright; see http://jcp.aip.org/about/rights_and_permissions 768 HUNTER, DAVENPORT, AND SETTEponents. Although Pinkerton and Bauer have already shown that molecules of high reaction rate greatly alter the absorption when added to molecules of low reaction rate, our results in the relaxation region show that the result is a mutual one. A.Raman spectra excited by 4880-A argon-ion-Iaser radiation and recorded photoelectrically have been obtained from a series of ternary aqueous solutions by back scattering and by 90° scattering using Cary and Jarrell-Ash double monochromators, respectively. The OD stretching region of HDO (and D 2 0), 2300-2800 cm-I, and the OH stretching region of H 20 plus HDO, ~2800-3800 cm-I, were examined for the following solutes: ((C.H,).NCI, and (15) Xe. (See Addendum for other solutes.) In addition, Raman spectra were obtained from HDO in H20 at pressures from 1 to 3790 bar at 25°C, and from a 5.0M solution of NaCIO. in HDO and H 20 at pressures of 690 and 3450 bar at 25°C. Several pronounced intensity maxima were observed in the OD and OH stretching regions for salts of extremely strong acids, (1)-(4), and some qualitative correlations with the strengths of the corresponding acids were found for (1)-(10). Solutes (1)-(11) were also found to act as structure breakers in water, but (12) was found to enhance structure, and some hydrogen bonding was found for (13). Further, no significant spectral effects were noted for (15) when the Xe concentration of the molten clathrate hydrate was 0.8M at 70°C and 1720 bar. For (14), however, an intense low-frequency OD stretching component was observed near 2483 cm-I • The (C 4 H,).N+ cation is the first found to produce pronounced effects in the OD and OH stretching regions, and the 2483 cm-I OD stretching component appears to arise from a marked structure-making effect. The effect of pressure on the OD stretching contour of HDO in H 20 was observed to be small. Only a slight decrease in the frequency of the nonhydrogen-bonded component centered near 2660 cm-I was uncovered to pressures of 3790 bar, and no significant pressure effect was observed for the NaCIO. solution to 3450 bar. The highpressure spectra indicate that pressure is not very effective in breaking the hydrogen bonds in water, and the filling of holes as the result of a redistribution of angles and distances in the hydrogen-bonded network is suggested as a more important effect.

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Section: The Cation (C 4 H 9 ) 4~y+mentioning

confidence: 88%

Raman Spectral Studies of the Effects of Solutes and Pressure on Water Structure

Walrafen¹

1971

The Journal of Chemical Physics

163

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“…Tetraalkylammonium ions (R 4 N + ) are often used as model systems to investigate hydrophobic phenomena . X-ray and neutron diffraction, Raman scattering, and IR absorption experiments have shown that water molecules around R 4 N + are hydrogen-bonded to each other to form hydration shells by the so-called “hydrophobic hydration” process …”

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confidence: 99%

Destruction of the Hydration Shell around Tetraalkylammonium Ions at the Electrochemical Interface

Yamakata

Osawa

2009

J. Am. Chem. Soc.

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The structure and behavior of the hydration shells around tetraethyl-, -propyl-, and -butylammonium ions (Et(4)N(+), Pr(4)N(+), and Bu(4)N(+), respectively) at a CO-covered Pt electrode was studied by surface-enhanced IR absorption spectroscopy. Selective concentration of cations at the electrochemical interface by controlling the applied potential facilitates the observation of the hydration shells without interference from hydrated anions. We report for the first time that the hydration shells around Pr(4)N(+) and Bu(4)N(+) are decomposed at sufficiently negative potentials because of the strong electrostatic attraction with the surface. On the other hand, the hydration shell around Et(4)N(+), the smallest ion, is more stable and does not decompose in the potential range examined. The difference in the stability can be ascribed to the difference in the size of the central cation. On the other hand, the hydration shells are easily deconstructed on a bare Pt surface because of the stronger interaction with the surface.

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“…The thermal properties of clathrate hydrates of quaternary ammonium fluorides (n-C4H9)3RNF were investigated in [49]: depending significantly on the type of the alkyl group (R: CH3, C2H5, n-C3H7, i-C3H7, n-C4H9, i-C4H9, n-C5H11, i-C5H11, C6H5CH2), the melting temperature varies from 1.5 °C to 28.3 °C. In Table 3 184 [44], 197 [52], 204 [54], 177 [54] 1057 [44] (n-C4H9)4NCl 30 [44] 15.0 [44] 156 [44] 1026 [44] (i-C5H11)4NF 39 [44], 28 [49] 31.5 [44], 26.4 [49] 256 [44] (i-C5H11)4NCl 39 [44] 29.6 [44] 283 [44] The clathrate hydrate of bolaform salts [C4H9)3N(CH2)n(C4H9)3]F2 may be regarded as extended hydrates that have a large guest molecule. From the solid-liquid phase diagrams [55] of mixtures of water, all salts appear to form hydrates that melt congruently and have large hydration numbers.…”

Section: Clathrate Hydrates Of Organic Compoundsmentioning

confidence: 99%

14th CIRIAF National Congress – Energy, Environment and Sustainable Development

Asdrubali¹,

Cotana²

2015

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Franco Cotana is a Teacher of Applied Physics, Course on Mechanical Engineering at the University of Perugia. He is also a Teacher of air conditioning systems and renewable energy, Course on Architectural Engineering at the University of Perugia. Prof. Cotana is the author of more than 280 scientific papers and has 18 patents in the fields of energetics, applied acoustics, heat transfer, applied thermodynamics, and lighting design. He is the Coordinator of many national and international research projects. Prof. Cotana is also a Member of the New York Academy of Sciences. He is also a Representative of the Italian Government in Brussels for the EIBI SET PLAN. Finally, Prof. Cotana is a Member of the Coordination Board of the AIA-IPPC Commission at the Italian Ministry for the Environment, Sea and Land Protection.

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Diffraction Pattern and Structure of the System Tetra-n-butylammonium Fluoride–Water at 25°C

Cited by 51 publications

References 6 publications

Raman Spectral Studies of the Effects of Solutes and Pressure on Water Structure

Raman Spectral Studies of the Effects of Solutes and Pressure on Water Structure

Destruction of the Hydration Shell around Tetraalkylammonium Ions at the Electrochemical Interface

14th CIRIAF National Congress – Energy, Environment and Sustainable Development

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