metal-organic compounds
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The title complex, [Cd(C9H7O2)2(H2O)2], was obtained as an unintended product of the reaction of cadmium nitrate with hexamethylenetetramine and cinnamic acid. The CdII ion lies on a twofold rotation axis and is coordinated in a slightly distorted trigonal–prismatic environment. In the crystal, the V-shaped molecules are arranged in an interlocking fashion along [010] and O—HO hydrogen bonds link the molecules, forming a two-dimensional network parallel to (001).
research communications
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The crystal structure of the title compound allowed the cis substituent orientation on the cyclopentanone ring to be established. The molecular conformation and crystal packing are governed by a network of hydrogen bonds and by π–π stacking.
organic compounds
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The title compound, C14H18F3NO8, was produced through conjugation of 1,3,4-tri-O-acetyl-2-azidodeoxy-α,β-L-fucose with trifluoroacetyl chloride in the presence of bis(diphenylphosphino)ethane in tetrahydrofuran at room temperature. The X-ray crystal structure reveals that the β-anomer of the product mixture crystallizes from ethyl acetate/hexanes. The compound exists in a typical chair conformation with the maximum possible number of substituents, four out of five, located in the sterically preferred equatorial positions. The major directional force facilitating packing of the molecules are N—HO hydrogen bonds involving the amide moieties of neighboring molecules, which connect molecules stacked along the a-axis direction into infinite strands with a C11(4) graph-set motif. Formation of the strands is assisted by a number of weaker C—HO interactions involving the methine and methyl H atoms. These strands are connected through further C—HO and C—HF interactions into a three dimensional network
organic compounds
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In the title proton-transfer organic salt, C5H6.3N5+·C8H4.7O4−·C3H7NO, the adeninium moiety is protonated at the N atom in the 1-position of the 6-amino-7H-purin-1-ium (adeninium) cation. In the solid state, the second acidic proton of isophthalic acid is partially transferred to the imidazole N atom of the adeninium cation [refined O—H versus N—H ratio = 0.70 (11):0.30 (11)]. Through the partially transferred proton, the adeninium cation is strongly hydrogen bonded (N—HO/O—HN) to the isophthalate anion. This strong interaction is assisted by another N—HO hydrogen bond originating from the adeninium NH2 group towards the isophthalate keto O atom, with an R22(8) graph-set motif. This arrangement is linked via N—HO hydrogen bonds to the O atoms of the carboxylate group of an isophthalate anion. Together, these hydrogen bonds lead to the formation criss-cross zigzag isophthalateadeninium chains lying parallel to (501) and (50-1). The adeninium cations and the isophthalate anions are arranged in infinite π stacks that extend along the c-axis direction [interplanar distance = 3.305 (3) Å]. Molecules are inclined with respect to this direction and within the stacks they are offset by ca. half a molecule each. Combination of the N—HO and O—HN hydrogen bonds with the π–π interactions forms infinitely stacked isophthalateadeninium chains, thus leading to a two-dimensional supramolecular structure with parallel interdigitating layers formed by the π stacked isophthalateadeninium chains. The DMF molecules of crystallization are bonded to the adeninium cations through strong N—HO hydrogen bonds and project into the lattice space in between the anions and cations. There are also C—HO hydrogen bonds present which, combined with the other interactions, form a three-dimensional network. The crystal under investigation was found to be split and was handled as if non-merohedrally twinned.
research communications
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The title compound consists of a macrocyclic ring with an MnIII—N—O repeat unit that occurs four times, producing a molecule with an overall square structure. Two Na+ ions are captured above and below the central cavity of the molecule.