Structure of water-hydrochloric acid complexes in argon and nitrogen matrices from infrared spectra

1977 ◽  
Vol 81 (22) ◽  
pp. 2095-2102 ◽  
Author(s):  
A. Schriver ◽  
B. Silvi ◽  
D. Maillard ◽  
J. P. Perchard
Keyword(s):  
Hydrochloric Acid ◽  
Infrared Spectra ◽  
Structure Of Water

Vibration-spectral studies of compounds formed by the combination of methylformamide and dimethylformamide with some strong acids

1966 ◽  
Vol 19 (11) ◽  
pp. 2091 ◽  
Author(s):  
E Spinner
Keyword(s):  
Hydrochloric Acid ◽  
Sulphuric Acid ◽  
Infrared Spectra ◽  
Spectral Studies ◽  
Ionic Form ◽  
Reaction Products ◽  
Unknown Structure ◽  
Acid Reaction ◽  
Strong Acids

A determination of the infrared spectra of the solid hydrochlorides of methylformamide and dimethylformamide and of the Raman spectra of their aqueous solutions showed that certain spectral features change with the medium used. The infrared spectra of the two amides in concentrated and in aqueous sulphuric acid, and in concentrated hydrochloric acid (HCl and DCl), are consistent with the existence of two amide/acid reaction products for each amide: one (certainly ionic) form predominates in sulphuric acid solutions; a second form, of unknown structure, is present in the solid hydrochlorides, and in hydrochloric acid the two forms coexist in equilibrium.

Collaborative Study of a Method for the Determination of Antipyrine and Benzocaine in Glycerol and Propylene Glycol Bases

1968 ◽  
Vol 51 (3) ◽  
pp. 624-626
Author(s):  
Richard T Krause
Keyword(s):  
Hydrochloric Acid ◽  
Propylene Glycol ◽  
Ferric Chloride ◽  
Infrared Spectra ◽  
Collaborative Study ◽  
Potassium Bromide ◽  
Reference Standards ◽  
Partition Chromatography ◽  
Average Recovery

Abstract A method for antipyrine and benzocaine, This Journal 50, 685-688 (1967), was studied by ten collaborators on five simulated commercial preparations at levels of 49—54 mg antipyrine/ml and 10—51 mg benzocaine/ml. The antipyrine and benzocaine are separated by column partition chromatography: antipyrine is retained on a ferric chloride column, and benzocaine is retained on a hydrochloric acid column. Maximum absorbances are determined on chloroform eluates at 272 and 283 mμ for antipyrine and benzocaine, respectively. Infrared spectra of the residues are determined in potassium bromide for identification of the drugs. The average recovery for antipyrine was 99.3 ± 1.80%, and for benzocaine, 99.0 ± 1 . 6 0 % . Infrared spectra submitted by collaborators corresponded to the reference standards and showed no interfering peaks. The method, with a slight change in the preparation of the standard solutions, is recommended for adoption as official, first action.

Infrared spectra of the weak hydrogen, oxygen and nitrogen complexes with hydrochloric acid in solid neon

1989 ◽  
Vol 93 (10) ◽  
pp. 3979-3983 ◽  
Author(s):  
Robert B. Bohn ◽  
Rodney D. Hunt ◽  
Lester Andrews
Keyword(s):  
Hydrochloric Acid ◽  
Infrared Spectra

scholarly journals Peculiarities of alginic acid hydration in the air and in hydrophobic organic environment

2021 ◽  
Vol 12 (2) ◽  
pp. 149-154
Author(s):  
T. V. Krupskaya ◽  
◽  
N. V. Yelahina ◽  
L. P. Morozova ◽  
V. V. Turov ◽  
...  
Keyword(s):  
Hydrochloric Acid ◽  
1H Nmr Spectroscopy ◽  
Adsorption Layer ◽  
Organic Molecules ◽  
Alginic Acid ◽  
Water Clusters ◽  
Solid Particles ◽  
Polymer Chains ◽  
Interfacial Layers ◽  
Structure Of Water

The effect of the medium on the parameters of water bound to the surface of alginic acid powder was studied by low-temperature 1H NMR spectroscopy. The aim of this work was to study the effect of hydrophobic environment on the binding of water with alginic acid and to compare the parameters of the interfacial layers of water in air, in chloroform and chloroform with the addition of hydrochloric acid. It is shown that when adsorbed on the surface (500 mg/g H2O), most of it is strongly bound. It is shown that for most dispersed systems, when replacing the air with chloroform, the interfacial energy of water increases from 11.8 to 15.2 kJ/mol, which is due to the capability of weakly polar organic molecules to diffuse on the surface of solid particles, thereby reducing the interaction energy with the adsorbed surface water clusters. It is concluded that chloroform molecules cannot diffuse on the surface of alginic acid particles and affect only the structure of water clusters localized in the outer adsorption layer. In the presence of hydrochloric acid on the surface of alginic acid, a system of water clusters is formed, most of which does not dissolve hydrochloric acid, and the radii of these clusters is 2 nm, which are likely to form in the gaps between the polymer chains of polysaccharide.

Fine Structure of Platelet Interaction with a New Microcrystalline Collagen Preparation

1974 ◽  
Vol 32 ◽  
pp. 58-59
Author(s):  
W. H. Zucker ◽  
R. G. Mason
Keyword(s):  
Fine Structure ◽  
Platelet Aggregation ◽  
Hydrochloric Acid ◽  
Whole Blood ◽  
Platelet Adhesion ◽  
Hemostatic Agent ◽  
Native Collagen ◽  
Fibrillar Morphology ◽  
Clinical Interest ◽  
New Form

Platelet adhesion initiates platelet aggregation and is an important component of the hemostatic process. Since the development of a new form of collagen as a topical hemostatic agent is of both basic and clinical interest, an ultrastructural and hematologic study of the interaction of platelets with the microcrystalline collagen preparation was undertaken.In this study, whole blood anticoagulated with EDTA was used in order to inhibit aggregation and permit study of platelet adhesion to collagen as an isolated event. The microcrystalline collagen was prepared from bovine dermal corium; milling was with sharp blades. The preparation consists of partial hydrochloric acid amine collagen salts and retains much of the fibrillar morphology of native collagen.

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