title: Crystal structures of 2-aminotropone, n,n'-di(tropon-2-yl)piperazine, and 5-(4-ethoxyphenylazo)tropolone.
abstract: Crystal structures of 2-aminotropone (1), N,N'-di(tropon-2-yl)piperazine (2), and 5-(4-ethoxyphenylazo)tropolone (3) have been elucidated by X-crystallographic analysis. 2-Aminotropone (1) contains three crystallographically independent molecules in the crystal lattice. The NH2 groups of 2-aminotropone unit of 1 participate in the N-H...O intermolecular hydrogen bonds. Two tropone units of N,N'-di(tropon-2-yl)piperazine (2) have an anti orientation to the piperazine ring. The crystal packing of 2 is consolidated by pi...pi, C-H...pi, and C-H...O interactions. 5-(4-Ethoxyphenylazo)tropolone (3) forms O-H...O hydrogen bond dimmers about inversion centres, involving the OH group and an intermolecular carbonyl O acceptor.
authors.affiliation: School of Dentistry, Health Sciences University of Hokkaido, Japan. kubo-k@hoku-iryo-u.ac.jp
authors.forename: Kanji
authors.initials: K
authors.lastname: Kubo
authors.forename: Emi
authors.initials: E
authors.lastname: Yamamoto
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Kakihara
authors.forename: Taisuke
authors.initials: T
authors.lastname: Matsumoto
authors.forename: Akira
authors.initials: A
authors.lastname: Mori
mesh_terms: D000588:Amines / Q000737:chemistry; D001391:Azo Compounds / Q000138:chemical synthesis*; D001672:Biocompatible Materials / Q000737:chemistry*; D018360:Crystallography, X-Ray; D019281:Dimerization; D006860:Hydrogen Bonding; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D008968:Molecular Conformation; D010879:Piperazines / Q000138:chemical synthesis*; D014334:Tropolone / Q000031:analogs & derivatives* / Q000138:chemical synthesis*
chemical_list: C532753:2-aminotropone; C532755:5-(4-ethoxyphenylazo)tropolone; D000588:Amines; D001391:Azo Compounds; D001672:Biocompatible Materials; C532754:N,N'-di-(tropon-2-yl)piperazine; D010879:Piperazines; D014334:Tropolone