Acidity Function Behavior in Aqueous-organic Solvents. I. The H0, and HA Functions in 70% DMSO–H2O

Autor:	Keith Yates, Graeme Welch
Rok vydání:	1972
Předmět:	chemistry.chemical_compound Aqueous solution Chemistry Stereochemistry Organic Chemistry Sulfuric acid General Chemistry Acidity function Catalysis Nuclear chemistry
Zdroj:	Canadian Journal of Chemistry. 50:1513-1522
ISSN:	1480-3291 0008-4042
DOI:	10.1139/v72-239
Popis:	The H0, [Formula: see text] and (in part) the HA acidity functions have been determined in 70% DMSO–water for the sulfuric acid concentration range 0–85%. In sharp contrast to purely aqueous acid systems the H0 (primary aniline) and [Formula: see text] (tertiary aniline) scales in DMSO–water are closely parallel over a wide range of acidity. This provides clear experimental demonstration that linearity of log (ionization ratio) vs. acidity function with unit slope is not a sufficient condition that a base is obeying a given acidity function. When the three acidity functions in DMSO–water are shifted to a purely aqueous standard state, their order is completely reversed from that observed in aqueous acids. These differences in behavior are discussed in terms of cation solvation by DMSO molecules only.
Databáze:	OpenAIRE
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