THz Raman spectra of aqueous solutions of hydrophiles and amphiphiles

2013 ◽  
Author(s):  
Ismael A. Heisler ◽  
Kamila Mazur ◽  
Steve R. Meech
Keyword(s):  
Aqueous Solutions ◽  
Raman Spectra

Protonation du N,N-diméthylformamide: étude par spectrométries vibrationnelle et électronique

1975 ◽  
Vol 53 (3) ◽  
pp. 442-447 ◽  
Author(s):  
P. Combelas ◽  
M. Costes ◽  
C. Garrigou-Lagrange
Keyword(s):  
Aqueous Solutions ◽  
Raman Spectra ◽  
Infrared And Raman Spectra ◽  
Protonation Equilibrium ◽  
Ionization Equilibria

Infrared and Raman spectra of acidic (hydrochloric or sulfuric) aqueous solutions of dimethylformamide indicate the existence of a single protonation equilibrium.[Formula: see text]The pK for this reaction was evaluated as −1.35 ± 0.05 from u.v. spectra; a less precise value (−1.1 ± 0.5) was obtained from Raman spectra. This result disagrees with earlier conclusions which favored the existence of two ionization equilibria for dimethylformamide. [Journal translation]

Windowless cell for fourier transform Raman spectra of liquids and aqueous solutions

1995 ◽  
Vol 26 (5) ◽  
pp. 331-334 ◽  
Author(s):  
Murray H. Brooker ◽  
Ole Faurskov Nielsen ◽  
Daniel Christensen
Keyword(s):  
Fourier Transform ◽  
Aqueous Solutions ◽  
Raman Spectra ◽  
Fourier Transform Raman

scholarly journals Molecular Species in Concentrated Aqueous Solutions of Cadmium Halides as Inferred from the Raman Spectra.

1979 ◽  
Vol 33a ◽  
pp. 11-13 ◽  
Author(s):  
Chr. Knakkergaard Møller ◽  
Kurt Nielsen ◽  
Terje Østvold ◽  
Arne Holm ◽  
Nils H. Toubro ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Raman Spectra ◽  
Molecular Species ◽  
Concentrated Aqueous Solutions

Raman spectra of glassy aqueous solutions

1979 ◽  
Vol 62 (1) ◽  
pp. 82-85 ◽  
Author(s):  
H. Kanno ◽  
J. Hiraishi
Keyword(s):  
Aqueous Solutions ◽  
Raman Spectra

scholarly journals Low-frequency Raman Spectroscopy of Aqueous Solutions of Aliphatic Alcohols

2001 ◽  
Vol 56 (8) ◽  
pp. 529-536 ◽  
Author(s):  
Koji Ydoshida ◽  
Toshio Yamaguchi
Keyword(s):  
Aqueous Solutions ◽  
Raman Spectra ◽  
Mole Fraction ◽  
Water Clusters ◽  
Pure Water ◽  
Low Frequency ◽  
Isosbestic Point ◽  
X Ray Diffraction ◽  
Alcohol Water ◽  
Solvent Clusters

Abstract Low-frequency Raman spectra have been measured at room temperature as functions of the alcohol mole fraction in aqueous solutions of methanol, ethanol, 1-propanol, 2 -propanol, and /er/-butylalcohol (TBA). Intrinsic Raman spectra R (ῡ) were obtained from depolarized Rayleigh wing spectra. Isosbestic points have been observed in R (ῡ) of the aqueous solutions of ethanol, 1-propanol, and 2 -propanol, suggesting that the structure o f the solutions is characterized by individual alcohol aggregates and water clusters without a significant amount of alcohol-water mixed aggregates. The R (ῡ) spectra have been expressed as R (ῡ ,x ) = w R (ῡ ,0 ) + aR(D, 1), where R(ῡ, 0) and R(ῡ, 1) are those for pure water and pure alcohols, respectively, and x is the mole fraction of alcohols. The coefficients w and a show the inflection points at characteristic alcohol mole fractions, where microhetrogeneity and structural transition of the solvent clusters take place, as previously shown by X-ray diffraction. In the aqueous solutions of methanol, where no microhetrogeneity takes place, no clear isosbestic point in R(ῡ) has been observed. For aqueous solutions of TBA, an isosbestic point in R(ῡ) has appeared when xTBA > 0.05. Two inflections points in the coefficients have been observed at xTBA « 0.1 and 0.35; the former composition corresponds to the transition composition from the TBA-TBA intermolecular contact to the TBA water molecular association, as previously reported by neutron diffraction.

Vibrational Spectral Studies of Hexaquozinc Nitrate and Hexaquozinc Nitrate-d2

1971 ◽  
Vol 49 (9) ◽  
pp. 1510-1514 ◽  
Author(s):  
M. H. Brooker ◽  
D. E. Irish
Keyword(s):  
Aqueous Solutions ◽  
Raman Spectra ◽  
Deuterium Oxide ◽  
Ionic Association ◽  
Spectral Studies ◽  
Site Symmetry ◽  
Infrared And Raman Spectra ◽  
Concentrated Aqueous Solutions ◽  
Site Group ◽  
A Site

Infrared and Raman spectra are reported for the hexaquozinc nitrate crystal. Replacement of water by deuterium oxide causes a remarkable intensity reversal of components in the ν3 nitrate region and provides Raman spectra free from interference in the 2ν2 and ν4 regions. The nitrate spectrum is interpreted in terms of a site group approximation. The spectra are compared with those of concentrated aqueous solutions and partially dehydrated crystals to point up changes which result from a lowered site symmetry and those which result from ionic association.

Background photobleaching in raman spectra of aqueous solutions of plant toxins

2002 ◽  
Author(s):  
Nikolai N. Brandt ◽  
Andrey Y. Chikishev ◽  
Alexander G. Tonevitsky
Keyword(s):  
Aqueous Solutions ◽  
Raman Spectra ◽  
Plant Toxins

Local, solvation pressures and conformational changes in ethylenediamine aqueous solutions probed using Raman spectroscopy

2016 ◽  
Vol 18 (37) ◽  
pp. 26192-26198 ◽  
Author(s):  
Mercedes Cáceres ◽  
Alvaro Lobato ◽  
Nubia J. Mendoza ◽  
Laura J. Bonales ◽  
Valentín G. Baonza
Keyword(s):  
Raman Spectroscopy ◽  
Aqueous Solutions ◽  
Conformational Change ◽  
Raman Spectra ◽  
Conformational Changes

Raman spectra of 1,2-ethylenediamine (EDA) in aqueous solutions are used to demonstrate that EDA molecules experience an anti–gauche conformational change resulting from the interactions with water.

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