title: Crystallographic characterization of the first reported crystalline form of the potent hallucinogen (R)-2-amino-1-(8-bromobenzo[1,2-b;5,4-b']difuran-4-yl)propane or 'bromodragonfly': the 1:1 anhydrous proton-transfer compound with 3,5-dinitrosalicylic acid.
abstract: The 1:1 proton-transfer compound of the potent substituted amphetamine hallucinogen (R)-2-amino-1-(8-bromobenzo[1,2-b;5,4-b']difuran-4-yl)propane (common trivial name 'bromodragonfly') with 3,5-dinitrosalicylic acid, namely 1-(8-bromobenzo[1,2-b;5,4-b']difuran-4-yl)propan-2-aminium 2-carboxy-4,6-dinitrophenolate, C(13)H(13)BrNO(2)(+).C(7)H(3)N(2)O(7)(-), forms hydrogen-bonded cation-anion chain substructures comprising undulating head-to-tail anion chains formed through C(8) carboxyl-nitro O-H...O associations and incorporating the aminium groups of the cations. The intrachain cation-anion hydrogen-bonding associations feature proximal cyclic R(3)(3)(8) interactions involving both an N(+)-H...O(phenolate) and the carboxyl-nitro O-H...O associations and aromatic pi-pi ring interactions [minimum ring centroid separation = 3.566 (2) A]. A lateral hydrogen-bonding interaction between the third aminium H atom and a carboxyl O-atom acceptor links the chain substructures, giving a two-dimensional sheet structure. This determination represents the first of any form of this compound and is in the (R) absolute configuration. The atypical crystal stability is attributed both to the hydrogen-bonded chain substructures provided by the anions, which accommodate the aminium proton-donor groups of the cations and give crosslinking, and to the presence of the cation-anion aromatic ring pi-pi interactions.
authors.affiliation: Faculty of Science and Technology, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia. g.smith@qut.edu.au
authors.forename: Graham
authors.initials: G
authors.lastname: Smith
authors.forename: Marcus S
authors.initials: MS
authors.lastname: Cotton
authors.forename: Urs D
authors.initials: UD
authors.lastname: Wermuth
authors.forename: Sue E
authors.initials: SE
authors.lastname: Boyd
mesh_terms: D018360:Crystallography, X-Ray; D005663:Furans / Q000737:chemistry*; D006213:Hallucinogens / Q000737:chemistry*; D006860:Hydrogen Bonding; D008958:Models, Molecular; D015394:Molecular Structure; D011407:Propane / Q000031:analogs & derivatives* / Q000737:chemistry; D011522:Protons; D012459:Salicylates / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: C550753:(R)-2-amino-1-(8-bromobenzo(1,2-b-5,4-b')difuran-4-yl)propane; D005663:Furans; D006213:Hallucinogens; D011522:Protons; D012459:Salicylates; C027011:3,5-dinitrosalicylic acid; D011407:Propane