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Figure 2
Fragments of β-glycine (on the left side) and β′-glycine (on the right side) crystal structures in two orientations. The blue and yellow colors correspond to two symmetrically independent zwitterions. Hydrogen bonds numbered I, II, III and IV correspond to those in the text, tables and other figures. Hydrogen bonds are shown by cyan dotted lines. Symmetry codes of acceptors in hydrogen bonds: (I) −x, y + ½, −z; (II) x, y, z − 1; (III) −x, y + ½, −z; (IV) −x, y + ½, −z + 1. |