Hydrogen bonding in brucinium dihydrogen citrate trihydrate at 130 K

Abstract

The structure of brucinium dihydrogen citrate trihydrate (systematic name: 2,3-dimethoxy-10-oxostrychnidinium dihydrogen citrate trihydrate), C(23)H(27)N(2)O(4)(+).C(6)H(7)O(7)(-).3H(2)O, has been determined at 130 K. The crystallographic asymmetric unit comprises two brucinium cations, two dihydrogen citrate anions and six water molecules of solvation. The two citrate anions, which are conformationally dissimilar, associate through extensive hydrogen-bonding interactions with the common undulating brucinium cation layer substructures and the water molecules, forming a three-dimensional framework polymer.