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276 citations found for Zhang, C
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The title compound, C10H24N2O2, was synthesized by N-alkylation of 1,2-dichloroethane with racemic 2-amino-1-butanol. The molecule lies on a crystallographic inversion center and the crystal structure is stabilized by intermolecular O—H
N and N—H
O hydrogen bonds.
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The asymmetric unit of the title compound, C10H26N2O22+·2NO3−, comprises one half of an N-diprotonated (R,S)-ethambutol cation, which lies about a centre of symmetry, and a nitrate anion. In the crystal structure, a two-dimensional network is formed via intermolecular O—H
O and N—H
O hydrogen bonds.
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The title compound, C10H28N2O10S2, was synthesized by the reaction of concentrated sulfuric acid with (R,S)-ethambutol. The zwitterionic amino–sulfate system, protonated at both N atoms, lies about a centre of symmetry. The asymmetric unit also contains a solvent water molecule. In the crystal structure, intermolecular O—H
N and N—H
O hydrogen bonds link the molecules into a three-dimensional network.
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The title compound, C10H24N2O2, was synthesized by N-alkylation of 1,2-dichloroethane with (S)-2-amino-1-butanol. In the crystal structure, O—H
N and N—H
O link the molecules into sheets in the bc plane.
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In the title compound, C24H16N2O6, the dihedral angles between the central 4,5-dicyano-1,2-phenylene unit [maximum deviation from planarity = 0.014 (4) Å] and the pendant benzene rings are 73.62 (5) and 84.08 (6)°.
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In the crystal structure of the title compound, C15H14N2O3, molecules are connected via weak intermolecular O—H
O and C—H
O hydrogen-bonding interactions, forming a zigzag form.
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Molecules of the title compound, C20H16N6.4H2O, lie across crystallographic inversion centres. The dihedral angle between each benzotriazole moiety and the central benzene ring is 74.95 (9)°. In the crystal structure, the molecular organization is stabilized by well defined weak C—H
π, π–π, O—H
O and O—H
N intermolecular interactions, leading to the formation of a two-dimensional network.
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The diamagnetic levitation technique can aid in obtaining high-quality protein crystals. Comparison of the results obtained using three containerless conditions indicated that the diamagnetic levitation technique exhibited the greatest improvement in crystal quality, followed by that using agarose gel.
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The self-assembly of tetrathiomolybdate, silver iodide and cerium nitrate in N,N-dimethylacetamide (dmac) and methanol resulted in a one-dimensional anionic Mo/S/Ag polymer, catena-poly[heptakis(N,N-dimethylacetamide-κO)(methanol-κO)cerium(III) [di-μ3-sulfido-octa-μ2-sulfido-disulfidotrisilver(I)trimolybdenum(VI)]], {[Ce(C4H9NO)7(CH4O)][Mo3S12Ag3]}n. The polymeric anion {[Mo3S12Ag3]n}3n− assumes a new configuration of a saw-tooth chain with the lengths of the sides in a 1:2 ratio. Such a configuration is intermediate between the polymeric anions in two reported compounds, viz. {[Ca(DMF)6][Mo2S8Ag2]}n and {[Ca(DMSO)6]2[W4S16Ag4]}n (DMF is dimethylformamide and DMSO is dimethyl sulfoxide). The metal atoms in the chain are nearly coplanar. The central Ce in the solvent-coordinated cation has distorted square-antiprismatic coordination. Of the seven N,N-dimethylacetamide (dmac) molecules present, one is found to be disordered over two sites, with occupancy factors of 0.63 and 0.37. The overall structure can be viewed as consisting of staggered layers parallel to (010), which are formed by anionic chains propagating along the a axis and cations distributed in the spaces between the anionic chains. No notable interactions are found between cations and polymeric anions except for electrostatic attractions.
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The self-assembly of tetrathiotungstate(VI), silver sulfide and ytterbium(III) nitrate in hexamethylphosphoramide (hmp) resulted in a one-dimensional anionic W/S/Ag polymer, {[Yb(NO3)2(C6H18N3OP)4][WAgS4]}n. The central Yb coordination polyhedron in the cationic complex [Yb(hmp)4(NO3)2]+ is a distorted square antiprism. The [YbO8] assembly has an approximate fourfold inversion axis along the bisector of one of the chelating nitrate groups. The polymeric anion {[WS4Ag]−}n presents a distorted linear configuration, with W—Ag—W and Ag—W—Ag angles of 160.81 (7) and 153.41 (7)°, deviating significantly from the ideal 180°. The anionic chains in the title compound are similar to those in {N(C6H5CH2)(C2H5)3[MoS4Ag]}n: they both have a similar wave-like appearance but have different orientations. The former propagate along the c axis, while the latter have two orientations: one parallel to the a axis and the other parallel to the b axis.
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The title compound, {[Cd(C19H13N4O4)2(H2O)2]·4H2O}n or {[Cd(BBA)2(H2O)2]·4H2O}n, where BBA is 3,5-bis(isonicotinamido)benzoate, is isotypic with its Mn isologue [Chen et al. (2009). J. Coord. Chem. 62, 2421–2428]. The cation sits on a twofold axis and is six-coordinated in a slightly distorted octahedral geometry; the polyhedra are linked into zigzag chains, which are further connected by N—H
O, O—H
O and O—H
N hydrogen bonds as well as π–π interactions [centroid-centroid distance of 3.639 (2) Å], giving a three-dimensional supramolecular framework.
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The title compound, [Cd(C9H9O2)2(C12H8N2)]n, was synthesized in a water–methanol solution and its crystal structure was determined by X-ray diffraction analysis. The Cd atoms are octahedrally coordinated by two N atoms from phenanthroline and four O atoms from four different 3,5-dimethylbenzoate ions, completing the octahedral geometry. The O atoms of the carboxylate group coordinate to CdII in a bidentate bridging manner. The complex shows a one-dimensional chain structure of Cd atoms bridged by 3,5-dimethylbenzoate anions.
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In the crystal structure of the title compound, [Cd(C5H3O3)2(C10H8N2)]n, which was synthesized from the reaction of Cd(ClO4)2·6H2O, furan-2-carboxylic acid and 4,4′-bipyridine in methanol–water, the Cd atom is octahedrally coordinated by two N atoms of two bipyridine ligands and four O atoms of four furan-2-carboxylate ligands. The carboxylate group coordinates in a bridging mode; the Cd atom and 4,4′-bipyridine ligand lie on a crystallographic twofold rotation axis. The compound exhibits a layer structure arising from the bonding modes of the furan-2-carboxylate anion and the 4,4′-bipyridine heterocycle.
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A 4-(isonicotinamido)phthalate ligand links NiII centres into a three-dimensional structure with sra topology. The structure is stabilized by N-H
O hydrogen bonding between uncoordinated amide groups and extensive O-H
O hydrogen bonding between the coordinated water molecules.
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A zinc(II) compound, prepared by the reaction of Zn(NO3)2·6H2O with naphthalene-2,6-dicarboxylic acid and 1,3-bis(2-methyl-1H-imidazol-1-yl)benzene in a mixture of H2O and dimethylformamide, possesses a twofold interpenetrating two-dimensional network. The compound exhibits strong fluorescence emissions and a high photocatalytic activity for the degradation of Rhodamine B (RhB) under UV-light irradiation.
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The title compound, C24H30O7, displays a trans configuration with respect to the C=C bond. The cyclohexenone ring has an envelope conformation; the flap atom (with the isopropoxycarbonyl groups) is displaced by 0.664 (3) Å from the plane of the other five ring atoms and the carbonyl O atom. The dihedral angle between the cyclohexenone ring and the benzene ring is 7.85 (9)°. The meta and para methoxy O atoms are displaced by 0.003 (7) and 0.031 (4) Å, respectively, from the benzene ring to which they are attached.
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In the title natural product, C17H24O4, which is a very potent inhibitor of protein synthesis in mammalian cells, the five-membered ring displays an envelope conformation, whereas the two six-membered rings show different conformations, viz. chair and half-chair.
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The title compound, C16H16O8, is a potent nonspecific phytotoxin. The crystal structure is the average of two tautomers, 5,6,7,9,10-pentahydroxy-2-methoxy-7-methyl-1,4,5,6,7,8-hexahydroanthracene-1,4-dione and 1,4,5,6,7-pentahydroxy-2-methoxy-7-methyl-5,6,7,8,9,10-hexahydroanthracene-9,10-dione. The cyclohexene rings in both tautomers display a half-chair conformation. An extensive O—H
O hydrogen-bonding network is present in the crystal structure.
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