Infrared study of the self-association of water dissolved in 1,2-dichloroethane

1968 ◽  
Vol 46 (4) ◽  
pp. 567-570 ◽  
Author(s):  
C. Jolicoeur ◽  
A. Cabana
Keyword(s):  
Low Frequency ◽  
Solute Concentration ◽  
Chain Structure ◽  
Linear Increase ◽  
Small Frequency ◽  
Open Chain ◽  
Infrared Study ◽  
Frequency Shifts ◽  
Polymeric Species ◽  
Self Association

The infrared spectra, in the 3 micron region, of H2O or HDO dissolved in 1,2-dichloroethane are presented. Self-association of the solute molecules is revealed by the appearance of a shoulder on the low frequency side of the OH stretching bands of monomeric H2O or HDO. From the linear increase of the intensity of the shoulder with the third power of the solute concentration, it is inferred that trimers constitute the main polymeric species present in these solutions. The small frequency shifts of the OH stretching mode of trimeric water favors a cyclic rather than an open-chain structure. The observation of a single band for the trimer correlates with this last assertion.

Infrared study on the self-association of dimethyl sulfoxide

1966 ◽  
Vol 22 (4) ◽  
pp. 587-592 ◽  
Author(s):  
R.H. Figueroa ◽  
E. Roig ◽  
H.H. Szmant
Keyword(s):  
Dimethyl Sulfoxide ◽  
The Self ◽  
Infrared Study ◽  
Self Association

scholarly journals Crystal structure of sodium (1S)-D-lyxit-1-ylsulfonate

2016 ◽  
Vol 72 (5) ◽  
pp. 628-631
Author(s):  
Alan H. Haines ◽  
David L. Hughes
Keyword(s):  
Crystal Structure ◽  
Three Dimensional ◽  
Chain Structure ◽  
Zigzag Chain ◽  
Sugar Chain ◽  
Open Chain ◽  
Torsion Angles ◽  
Hydroxymethyl Group ◽  
Sodium Hydrogen ◽  
Group Form

The title compound, Na+·C5H11O8S−[systematic name: sodium (1S,2S,3S,4R)-1,2,3,4,5-pentahydroxypentane-1-sulfonate], is formed by reaction of D-lyxose with sodium bisulfite (sodium hydrogen sulfite) in water. The anion has an open-chain structure in which one of the oxygen atoms of the sulfonate residue, the S atom, the C atoms of the sugar chain and the O atom of the hydroxymethyl group form an essentially planar zigzag chain with the corresponding torsion angles lying between 179.80 (11) and 167.74 (14)°. A three-dimensional bonding network exists in the crystal structure involving hexacoordination of sodium ions by O atoms, three of which are provided by a single D-lyxose–sulfonate unit and the other three by two sulfonate groups and one hydroxymethyl group, each from separate units of the adduct. Extensive intermolecular O—H...O hydrogen bonding supplements this bonding network.

Infrared Study of Ag_2O in the Low-Frequency Region

1965 ◽  
Vol 55 (2) ◽  
pp. 209 ◽  
Author(s):  
Neil T. McDevitt ◽  
Allan D. Davidson
Keyword(s):  
Low Frequency ◽  
Frequency Region ◽  
Infrared Study

scholarly journals The Effects of Rapid Rotation on Pulsation

2002 ◽  
Vol 185 ◽  
pp. 177-185
Author(s):  
Hideyuki Saio
Keyword(s):  
Low Frequency ◽  
Rotation Frequency ◽  
Rotating Stars ◽  
Frequency Shifts ◽  
Rapid Rotation ◽  
The Stability

AbstractWe discuss the properties of pulsations in rotating stars, which include frequency shifts, the effects on the stability of p- and g-modes, and the properties of low-frequency modes whose frequencies are comparable to or less than the rotation frequency.

The Lability of Sulfur Atoms in Vulcanization

1960 ◽  
Vol 33 (4) ◽  
pp. 1010-1014
Author(s):  
G. A. Blokh
Keyword(s):  
High Energy ◽  
Chain Structure ◽  
Elementary Sulfur ◽  
Open Chain ◽  
Isotope Method ◽  
Sulfur Containing ◽  
Unstable Intermediate ◽  
Sulfur Containing Compounds

Abstract The application of the isotope method to the investigation of the mechanism of the action of accelerator and vulcanizing agents has made it possible to look at this question in quite a new light. With the help of the isotope S it has been demonstrated that in the process of curing there takes place a continuous exchange of atoms of sulfur in the structure of the accelerators, and of elementary sulfur as a vulcanizing agent, with the formation of unstable intermediate compounds. The sulfur thus liberated undoubtedly has high energy, as a result of which it combines rapidly with the rubber. It must be remembered in this connection that the reacting elementary sulfur is an eight-membered S8 ring, while the sulfur liberated from the sulfur containing compounds has the open chain structure:

scholarly journals Sodium (1R)-D-glucit-1-ylsulfonate monohydrate

2012 ◽  
Vol 68 (4) ◽  
pp. m377-m378 ◽  
Author(s):  
Alan H. Haines ◽  
David L. Hughes
Keyword(s):  
Complex Cation ◽  
Three Dimensional ◽  
Addition Product ◽  
Chain Structure ◽  
Water Molecules ◽  
Open Chain ◽  
Carbon Chains ◽  
Molecular Anions ◽  
Dimensional Network ◽  
Cation Coordination

The title salt, Na+·C6H13O9S−·H2O, crystallizes with three independent cations, molecular anions and solvent water molecules in the asymmetric unit. This crystalline monohydrate addition product, formed by reaction of D-glucose and sodium hydrogen sulfite in water, forms a three-dimensional network through complex cation coordination and extensive intermolecular hydrogen bonding. Each of the independent molecules has an open-chain structure with the carbon chains adopting a sickle-like conformation, similar to that found in the potassium salt [Coleet al.(2001).Carbohydr. Res.335, 1–10], but there are significant differences in the patterns of complexation.

A Low Temperature Infrared Study of Self-association in Thiols

1972 ◽  
Vol 50 (22) ◽  
pp. 3594-3600 ◽  
Author(s):  
R. Bicca de Alencastro ◽  
C. Sandorfy
Keyword(s):  
Hydrogen Bonding ◽  
Low Temperature ◽  
Infrared Spectra ◽  
Low Temperatures ◽  
Infrared Study ◽  
Text Type ◽  
Stretching Vibration ◽  
Aliphatic Thiols ◽  
Self Association ◽  
Associated Species

The infrared spectra of several aliphatic thiols and of benzenethiol were measured between 2400 and 2700 cm−1, and 4800 and 5300 cm−1 in a 1:1 mixture of CCl3F and C2F4Br2, at temperatures ranging from 20 to −190 °C. Dimerization takes place at low temperatures and more highly associated species also appear. Free S—H groups are present in the solutions as well as in the pure liquids, even at the lowest temperatures. The association is of the [Formula: see text] type in aliphatic thiols; both [Formula: see text] and [Formula: see text] bonds are found in the case of benzenethiol and α-toluenethiol. Hydrogen bonding has little effect on the anharmonicity of the S—H stretching vibration.

Bias and Variance in the Estimate of the Doppler Frequency Induced by a Wall Motion Filter

1989 ◽  
Vol 11 (3) ◽  
pp. 215-225 ◽  
Author(s):  
J.C. Willemetz ◽  
A. Nowicki ◽  
J.J. Meister ◽  
F. De Palma ◽  
G. Pante
Keyword(s):  
Wall Motion ◽  
Low Frequency ◽  
Doppler Frequency ◽  
Correlated Noise ◽  
Pulsed Doppler ◽  
Flow Mapping ◽  
Frequency Shifts ◽  
Doppler Signals ◽  
Frequency Aliasing ◽  
Correlation Techniques

In pulsed Doppler flowmeters, processing of the Doppler signals is often done digitally. The first step in the analysis of the echoes is the filtering which is needed to remove stationary components and low frequency shifts induced by wall motion. This preliminary step is of utmost importance. The influence of uncorrelated noise on the measurement of Doppler signals at the input of this filter is analysed. The frequencies of the Doppler signals are extracted by an algorithm based on correlation techniques. We observed that the filter induces a correlated noise term, which results in an overestimation of the frequency. An effect similar to frequency aliasing may appear. The level of the bias is dependent on filter characteristics and noise level. Our study was carried out on simulated Doppler signals using first and second order filters. An especially desirable solution in flow mapping is proposed in order to decrease this error.

ChemInform Abstract: Stabilization of the Open-Chain Structure of D-Galacturonic Acid in a Dimeric Complex with Oxovanadium(IV).

ChemInform ◽  
1990 ◽  
Vol 21 (40) ◽  
Author(s):  
M. BRANCA ◽  
G. MICERA ◽  
D. SANNA ◽  
A. DESSI ◽  
H. KOZLOWSKI
Keyword(s):  
Galacturonic Acid ◽  
Chain Structure ◽  
Dimeric Complex ◽  
Open Chain
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