Acta Cryst. (2014). C70, 326-331 [ doi:10.1107/S2053229614002563 ]
Abstract: The title zwitterion (2S)-2-azaniumyl-1-hydroxy-3-phenylpropan-1-olate, C9H11NO2, also known as L-phenylalanine, was characterized using synchrotron X-rays. It crystallized in the monoclinic space group P21 with four molecules in the asymmetric unit. The 0.62 Å resolution structure is assumed to be closely related to the fibrillar form of phenylalanine, as observed by electron microscopy and electron diffraction. The structure exists in a zwitterionic form in which - stacking and hydrogen-bonding interactions are believed to form the basis of the self-assembling properties.
CCDC reference: 985094
Keywords: crystal structure; synchrotron radiation; zwitterion; L-phenylalanine; fibrils; nanotubes; optical microscopy analysis.
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