title: 5-Cyanotropolone and 5-nitrotropolone.
abstract: The title compounds, 4-hydroxy-5-oxo-1,3,6-cycloheptatriene-1-carbonitrile, C(8)H(5)NO(2), (I), and 2-hydroxy-5-nitro-2,4,6-cycloheptatrien-1-one, C(7)H(5)NO(4), (II), have intra- and intermolecular hydrogen bonds. The structure of (II) contains two crystallographically independent molecules, (IIa) and (IIb). An intermolecular pi-pi interaction and an intermolecular NO(2).pi-pi interaction are present in (I) and (II), respectively.
authors.affiliation: Institute of Advanced Material Study, 86 Kyushu University, Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan. kubo-k@cm.kyushu-u.ac.jp
authors.forename: K
authors.initials: K
authors.lastname: Kubo
authors.forename: E
authors.initials: E
authors.lastname: Yamamoto
authors.forename: A
authors.initials: A
authors.lastname: Mori