Acta Cryst. (2012). E68, o2450 [ doi:10.1107/S1600536812031170 ]
Abstract: The title salt, C14H31N2+·C15H9O7-, was obtained in the reaction of quercetin with n-butylamine in a mixture of acetone and hexane. The crystal structure determination shows that the quercetin donates one of its phenol H atoms to the N-butyl-4-butylimino-2-methylpentan-2-amine molecule. The crystal structure of the salt is stabilized by intramolecular (N-H
N for the cation and O-HO for the anion) and intermolecular hydrogen bonding (N-HO between cation-anion pairs and O-HO between anions). Quercetin molecules form dimers connected into a two-dimensional network. The dihedral angle between the quercetin ring systems is 19.61 (8)°.
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