| Popis: |
The title compound, C6H13N2+·C20H7Br4O5−, is a molecular salt of singly protonated 1,4-diazabicyclo[2.2.2]octane and the eosinide monoanion. Contrary to a handful of previous crystal structures which contain eosin in its dianionic form, here, the carboxyl group of the anion has retained its H atom. The dihedral angle between the triple ring system and the pendant benzene ring in the anion is 86.0 (2)°. In the crystal structure, the components interact by way of a bifurcated N—H⋯(O,Br) hydrogen bond linking cation and anion, and an O—H⋯O hydrogen bond which links the anions into infinite chains propagating in [001]. |
