title: 6-Eth-oxy-carbonyl-5,7-dihy-droxy-2,3-dihydro-1H-pyrido[3,2,1-ij]quinolinium tribromide.
abstract: In the title salt, C15H16NO4(+.)Br3(-), classical intra-molecular O-H⋯O hydrogen bonds are found, which results in the co-planarity of the ester substituents with the quinolinium residue [C-C-C-O torsion angle = 1.0 (10)°]. The bromine anions are placed on both sides of heterocyclic cation and form Br⋯N contacts of 3.674 (9) and 3.860 (9) Å, which confirms the location of positive charge on the N atom. Non-classical inter-molecular C-H⋯Br inter-actions stabilize the three-dimensional crystal structure. Moreover, anion⋯π inter-actions are noted [Br⋯ring centroid range = 3.367 (9)-3.697 (9) Å]. The partly saturated heterocycle is disordered over two sofa conformations with occupancies in the ratio 0.56 (2):0.44 (2).
authors.affiliation: Department of Chemistry, Moscow State University, Moscow 119992, Russian Federation.
authors.forename: Victor B
authors.initials: VB
authors.lastname: Rybakov
authors.forename: Svitlana V
authors.initials: SV
authors.lastname: Shishkina
authors.forename: Igor V
authors.initials: IV
authors.lastname: Ukrainets
authors.forename: Nikolai Yu
authors.initials: NY
authors.lastname: Golik
authors.forename: Igor N
authors.initials: IN
authors.lastname: Chernenok