addenda and errata
Corrigendum to Acta Cryst. (2005), E61, o3523–o3525.
metal-organic compounds
In the hexacoordinated title germanium compound [alternatively called (butanoato-κ2C3,O)bis(8-quinolato-κ2N,O)germanium(IV)], [Ge(C9H7NO)2(C4H6O2)], the Ge atom adopts a slightly distorted octahedral geometry, where the Ge—N coordinate covalent bonds [mean 2.079 (8) Å] are significantly longer than the Ge—O [mean 1.904 (8) Å] and Ge—C [1.976 (3) Å] covalent bonds.
organic compounds
The 9,10-anthraquinone ring system of the title compound, C25H26O5, is essentially planar. The O-geranyl substituent is at the meta position with respect to the hydroxyl group. O—HO intramolecular hydrogen bonds are observed in the molecular structure. The molecules form centrosymmetric hydrogen-bonded dimers via intermolecular C—HO hydrogen bonds which generate rings of motif R22(10). The crystal structure is further stabilized by weak π–π interactions.
organic compounds
In the title compound, C18H20O5, one of the four methoxy groups is twisted out of the naphthalene ring plane as a result of steric hindrance. The orientation of the butenone substituent with respect to the attached ring is anticlinal.
organic compounds
The title compound, C17H14O6, has been isolated for the first time from Rhazya stricta. The dihedral angle between the mean planes through the benzopyran ring system and o-anisole group is 59.78 (5)°. The molecular packing is stabilized by O—HO and C—HO hydrogen bonds.
organic compounds
The title compound, C30H50O3, a lupane triterpene, was isolated from the leaves of Ceriops decandra (Griff.) Ding Hou. There are two crystallographically independent molecules in the asymmetric unit. In both molecules, the cyclopentane ring adopts an envelope conformation. In the crystal structure, molecules are interconnected into a two-dimensional network by intermolecular O—HO hydrogen bonds.
organic compounds
The title compound, C8H15NO7, the methyl carbamate of β-D-glucosamine has been synthesized, in moderate yield, from the reaction of β-D-glucosamine hydrochloride and methyl chloroformate. There are two crystallographically independent molecules in the asymmetric unit. In both molecules, the pyranose ring adopts a slightly distorted chair conformation. In the crystal structure, molecules are packed along the a axis, with intra- and intermolecular O—HO, N—HO and C—HO hydrogen bonds.
metal-organic compounds
The title compound, [Sn(CH3)3(C8H5Cl2O2)]n, forms polymeric chains involving both O atoms of the carboxylate group. The coordination geometry of the Sn atom is slightly distorted trigonal bipyramidal. The three methyl groups occupy the equatorial positions, with Sn—C bond lengths in the range 2.103 (8)–2.118 (7) Å. The two O atoms are situated in the axial positions, with Sn—O distances of 2.189 (4) Å and 2.369 (5) Å.
organic compounds
The title compound, C16H16N2O2, was synthesized by the condensation of aniline and succinic anhydride. The molecule lies across a crystallographic inversion centre. The dihedral angle between the benzene and acetamide planes is 33.36 (7)°. N—HO hydrogen bonds link the molecules into chains along [010].
organic compounds
The title compound, C20H32O4, was isolated from Pulicaria unduleta. It has an ent-kaurane diterpeniod ring system. In the crystal structure, the molecules are linked via O—HO hydrogen bonds into a ribbon structure.
organic compounds
The title compound, C12H13NO5, was synthesized by the condensation of methyl anthranilate and succinic anhydride. The dihedral angle between the phenylacetamide and carboxylic acid (–C—COOH) planes is 80.47 (5)°. In the crystal structure, inversion-related molecules form an O—HO hydrogen-bonded dimer. Adjacent dimers are interlinked by C—HO hydrogen bonds to form a chain along [110].
organic compounds
The title compound, C28H27O10Cl·CH3OH·H2O, was isolated from Physalis minima. The rigid molecule consists of eight fused rings involving three lactones. The spiro-fused γ-lactone rings are in half-chair and envelope conformations. The spiro-fused γ-lactone rings are fused to a cyclohexene ring, which is in a half-chair conformation. The outermost cyclohexene ring and δ-lactone rings adopt half-chair and envelope conformations, respectively. Intra- and intermolecular O—HO, C—HCl and C—HO hydrogen bonds are observed.
organic compounds
In the title compound, C35H42O4, the chromene ring is in a distorted half-chair conformation and the cyclohexadienone ring adopts a screw-boat conformation. Intramolecular O—HO hydrogen bonds involving the carbonyl and hydroxyl groups are observed.
organic compounds
The asymmetric unit of the title compound, C7H11N2+·ClO4−, contains a 4-(N,N-dimethylamino)pyridinium cation and a perchlorate anion linked via an N—HO hydrogen bond. Glide-related molecules are linked by C—HO hydrogen bonds to form a chain along the c axis. The chains are arranged to form a layered structure parallel to the bc plane.
organic compounds
The title compound, C23H24O6, a xanthone derivative, was isolated from Garcinia polyantha Oliver. The orientation of the 3,7-dimethylocta-2,6-dienyl substituent with respect to the xanthone ring system is (+)synclinal. The crystal packing is stabilized by O—HO and C—HO intermolecular hydrogen bonds and π–π interactions.