4-Aza-1-azoniabicyclo[2.2.2]octane eosinide

William T. A. Harrison, Palani Ramadevi, P. G. Seethalakshmi, Sudalaiandi Kumaresan

Research output: Contribution to journalArticle

10 Citations (Scopus)


 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 center dot center dot center dot (O,Br) hydrogen bond linking cation and anion, and an O-H center dot center dot center dot O hydrogen bond which links the anions into infinite chains propagating in [001].

Original languageEnglish
Article numbero3911
Number of pages12
JournalActa Crystallographica Section E: Structure Reports Online
Issue number9
Publication statusPublished - Sept 2007


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