Pairwise Gibbs Energies of Interaction InvolvingN-Alkyl-2-pyrrolidinones and Related Compounds in Aqueous Solution Obtained from Kinetic Medium Effects

2000 ◽  
Vol 65 (2) ◽  
pp. 411-418 ◽  
Author(s):  
Joke J. Apperloo ◽  
Lisette Streefland ◽  
Jan B. F. N. Engberts ◽  
Michael J. Blandamer
Keyword(s):  
Aqueous Solution ◽  
Medium Effects ◽  
Gibbs Energies ◽  
Related Compounds

scholarly journals Standard electrode potentials involving radicals in aqueous solution: inorganic radicals (IUPAC Technical Report)

2015 ◽  
Vol 87 (11-12) ◽  
pp. 1139-1150 ◽  
Author(s):  
David A. Armstrong ◽  
Robert E. Huie ◽  
Willem H. Koppenol ◽  
Sergei V. Lymar ◽  
Gábor Merényi ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Literature Review ◽  
Equilibrium Constants ◽  
Experimental Results ◽  
Gibbs Energies ◽  
Electrode Potentials ◽  
Technical Report ◽  
Standard Electrode Potentials ◽  
Best Estimates

AbstractRecommendations are made for standard potentials involving select inorganic radicals in aqueous solution at 25 °C. These recommendations are based on a critical and thorough literature review and also by performing derivations from various literature reports. The recommended data are summarized in tables of standard potentials, Gibbs energies of formation, radical pKa’s, and hemicolligation equilibrium constants. In all cases, current best estimates of the uncertainties are provided. An extensive set of Data Sheets is appended that provide original literature references, summarize the experimental results, and describe the decisions and procedures leading to each of the recommendations.

DETERMINATION OF GLYCEROL AND RELATED COMPOUNDS IN FERMENTATION SOLUTIONS BY PARTITION CHROMATOGRAPHY

1950 ◽  
Vol 28b (9) ◽  
pp. 535-540 ◽  
Author(s):  
A. C. Neish
Keyword(s):  
Aqueous Solution ◽  
Periodate Oxidation ◽  
Colorimetric Determination ◽  
Partition Chromatography ◽  
Sugar Alcohols ◽  
Modified Technique ◽  
Silica Column ◽  
To Receive ◽  
Related Compounds

A modified technique is described for applying partition chromatography, using a silica column, to the separation of simple organic compounds which are difficult to extract from water. An aqueous solution is pipetted directly on a Celite–water column the upper 15% of which has been left dry to receive it. Acetoin, 2, 3-butanediol, 1, 2-propanediol, ethanediol, glycerol, and erythritol can be separated from each other and from sugars and sugar alcohols containing five or more carbon atoms if the column is properly developed by ethyl acetate and benzene–butanol mixtures. After separation the compounds can be estimated by a rapid colorimetric determination of the acetaldehyde or formaldehyde formed by periodate oxidation. The recoveries are quantitative, thus making it possible to determine 1 to 2 mgm. of glycerol or 2, 3-butanediol within an error of ± 3% even when they are mixed with larger amounts of closely related compounds which cause interference in the usual methods.

The Fine Structure of Cytosine

1962 ◽  
Vol 15 (4) ◽  
pp. 851 ◽  
Author(s):  
DJ Brown ◽  
M Lyall
Keyword(s):  
Aqueous Solution ◽  
Nuclear Magnetic Resonance ◽  
Fine Structure ◽  
Magnetic Resonance ◽  
Nuclear Magnetic Resonance Spectrum ◽  
Tautomeric Form ◽  
Resonance Spectrum ◽  
Ionization Constants ◽  
Recent Formulation ◽  
Related Compounds

The ionization constants and ultraviolet spectra of cytosine, of its appropriately methylated derivatives, and of related compounds are used to indicate that its pre- dominant tautomeric form in aqueous solution is 4-amino-1,2-dihydro-2-oxopyrimidine. This is in sharp contrast to its recent formulation as a zwitterion on the grounds of its nuclear magnetic resonance spectrum.

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