title: Three 4-aminoquinolines of antimalarial interest.
abstract: The structures of three compounds with potential antimalarial activity are reported. In N,N-diethyl-N'-(7-iodoquinolin-4-yl)ethane-1,2-diamine, C15H20IN3, (I), the molecules are linked into ribbons by N-H...N and C-H...N hydrogen bonds. In N-(7-bromoquinolin-4-yl)-N',N'-diethylethane-1,2-diamine dihydrate, C15H20BrN3.2H2O, (II), two aminoquinoline molecules and four water molecules form an R5(4)(13) hydrogen-bonded ring which links to its neighbours to form a T5(2) one-dimensional infinite tape with pendant hydrogen bonds to the aminoquinolines. The phosphate salt 7-chloro-4-[2-(diethylammonio)ethylamino]quinolinium bis(dihydrogenphosphate) phosphoric acid, C15H22ClN3(2+).2H2PO4-.H3PO4, (III), was prepared in order to establish the protonation sites of these compounds. The phosphate ions form a two-dimensional hydrogen-bonded sheet, while the aminoquinoline cations are linked to the phosphates by N-H...O hydrogen bonds from each of their three N atoms. While the conformation of the quinoline region hardly varies between (I), (II) and (III), the amino side chain is much more flexible and adopts a significantly different conformation in each case. Aromatic pi-pi stacking interactions are the only supramolecular interactions seen in all three structures.
authors.affiliation: Department of Chemistry, University of Cape Town, Rondebosch 7701, South Africa.
authors.forename: Susan A
authors.initials: SA
authors.lastname: Bourne
authors.forename: Katherine
authors.initials: K
authors.lastname: De Villiers
authors.forename: Timothy J
authors.initials: TJ
authors.lastname: Egan
mesh_terms: D000634:Aminoquinolines / Q000737:chemistry* / Q000494:pharmacology; D000962:Antimalarials / Q000737:chemistry* / Q000494:pharmacology; D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D008958:Models, Molecular; D015394:Molecular Structure
chemical_list: D000634:Aminoquinolines; D000962:Antimalarials; C001920:4-aminoquinoline