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Solute–solvent and solvent–solvent interactions in binary solvent mixtures. Part 8. The ET(30) polarity of binary mixtures of formamides with hydroxylic solvents

✍ Scribed by Koit Herodes; Ivo Leito; Ilmar Koppel; Martí Rosés

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
87 KB
Volume
12
Category
Article
ISSN
0894-3230

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✦ Synopsis

Solvent effects on the binary mixtures of amides with alcohols and water were investigated by means of Reichardt's E T (30) solvatochromic indicator. E N T parameters of binary solvent mixtures of formamide, N-methylformamide and N,N-dimethylformamide with water, methanol, propan-2-ol, 2-methylpropan-2-ol, formamide, Nmethylformamide and N,N-dimethylformamide were measured over the whole composition range of the mixtures. Application of a preferential solvation model to the solvatochromic data shows that the preferential solvation of the solvatochromic indicator by the amides decreases in the order N-methylformamide b formamide b N,N-dimethylformamide. Synergism is observed for the mixtures of the amides with alcohols of similar polarity (E N T value), i.e. methanol-formamide, methanol-N-methylformamide, propan-2-ol-N,N-dimethylformamide and 2-methylpropan-2ol-N,N-dimethylformamide binary systems.

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