title: 4,7-Diaza-1-azoniacyclo-nonane bromide.
abstract: The title compound, C(6)H(16)N(3) (+)·Br(-), is the bromide of the monoprotonated aza-macrocyclic triamine 1,4,7-triaza-cyclo-nonane (tacn). The threefold axis of the triamine is broken by the protonation of one of the three amine functions. The ammonium proton is bonded in an intra-molecular symmetrically bifurcated hydrogen bond to the two endodentate amine functions. Direct cation-anion contacts are established via N-H⋯Br hydrogen bonds between the bromide anions and tacnH(+) cations.
authors.affiliation: Ludwig-Maximilians-Universität, Department Chemie und Biochemie, Butenandtstrasse 5-13, 81377 München, Germany.
authors.forename: Thorsten
authors.initials: T
authors.lastname: Allscher
authors.forename: Peter
authors.initials: P
authors.lastname: Klüfers
authors.forename: Christine
authors.initials: C
authors.lastname: Neumann