Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Conformation of α-Aminobutyric Acid in Aqueous Solution
Toshio AkimotoMasamichi TsuboiMasatsune KainoshoFumihide TamuraAsao NakamuraShuichi MuraishiTeruo Kajiura
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1971 Volume 44 Issue 10 Pages 2577-2582

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Abstract

Raman spectrum of α-aminobutyric acid has been observed in its 15% aqueous solution (neutral). By comparing it with the Raman and infrared spectra of crystal A (in which 40% of the total molecules are the T-form molecules, 36% Ga-, and 24% Gb-form molecules), crystal B (which consists only of T-form molecules), and a complex crystal of this amino acid with calcium chloride (in which 85% are the Ga-form molecules), it has been shown that the Ga-form molecules are predominant in the aqueous solution. Here, T-, Ga-, and Gb-forms have respectively the amino group, the hydrogen atom, and the carboxy group in the position trans to the methyl group in the internal rotation around the Cα-Cβ bond. Proton magnetic resonance spectrum was observed of a Cγ-deuterated product (CD3CH2CH NH3+COO) in its aqueous solution at several temperatures in the −1.5 to 91°C range. It has been indicated that the Ca-form is more stable by about 300 cal/mole than the other two forms.

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