The electric dipole moments of aniline, aminopyridines, and their N-methyl derivatives in benzene and 1,4-dioxan solutions
- 1 January 1967
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society B: Physical Organic
- p. 1096-1099
- https://doi.org/10.1039/j29670001096
Abstract
The electric dipole moments of aniline, 2-, 3-, and 4-aminopyridines, of their mono- and di-N-methyl derivatives, and of 2,3- and 2,6-diaminopyridines have been calculated from measurements of the dielectric constants, specific volumes, and refractive indices of their solutions in benzene and 1,4-dioxan at 25·00°. The results for 3-amino-pyridine are analogous to those for aniline. There is an appreciable mesomeric interation, increasing on N-methylation, between an amino-group in the 4 position and the pyridine ring but in the 2 position its direct interaction with the heterocyclic nitrogen atom complicates the situation. Amino-hydrogen atoms form bonds to dioxan solvent molecules.Keywords
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