Summary
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1.
In organic solvents in the concentration range investigated α-amino acids containing a tertiary nitrogen atom exist mainly in the form of nonionic molecular structures.
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2.
The state of an α-amino acid in solution is affected substantially not only by the presence of substituants on the nitrogen, but also by their character.
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3.
In the range 1600–1800 cm−1 the spectra of these compounds contain four bands. The band of frequency about 1640 cm−1 belongs to the valence vibrations of the carboxylate ion. The appearance of three bands at 1708, 1750, and 1780 cm−1 is associated with the shift of the valence-vibration frequencies of the carbonyl group due to hydrogen-bonding.
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4.
The formation of intermolecular hydrogen bonds was confirmed by molecular weight measurements.
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Yakovlev, I.P., Maksimov, V.I. Investigation of the structure of α-amino acids containing a tertiary nitrogen atom with the aid of infrared spectra. Russ Chem Bull 12, 791–795 (1963). https://doi.org/10.1007/BF01134726
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DOI: https://doi.org/10.1007/BF01134726