Racemic 2-Hydroxy-2-phenylpropanamidinium Chloride and (S)-2-Hydroxy-2-phenylbutanamidinium (R)-2-Hydroxy-2-phenylethanoate

In 2-hydroxy-2-phenylpropanamidinium chloride, C₉H₁₃N₂O⁺.Cl^-, the anion plays a central role in the hydrogen bond network, chelating to one amidinium group and forming intermolecular links to neighbouring NH₂ and OH^- groups. The central feature in (S)-2-hydroxy-2-phenylbutanamidinium (R)-2-hydroxy-2-phenylethanoate, C₁₀H₁₅N₂O⁺.C₈H₇O₃^-, is a ring linking the cation and anion through two hydrogen bonds. The structure is extended by intra- and intermolecular hydrogen bonds.

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