Expanding the possibilities: The hydration of glycine has been observed in a supersonic jet by using laser ablation in combination with Fourier transform microwave spectroscopy. The rotational spectrum reveals that water binds to glycine through two hydrogen bonds, which bridge the carboxylic acid group in a closed planar structure. In the complex, glycine retains the most stable conformer of the parent unhydrated molecule.
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Alonso et al. (2006) studied this question.
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