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15 citations found for Hu, Q

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The title compound, C18H14O2, is almost planar with a dihedral angle of 1.24 (2)° between the phenyl­ethynyl and styryl groups. The acet­oxy group is tilted by 82.46 (2) and 82.26 (3)° with respect to the benzene ring planes.

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The mol­ecule of the title compound, C24H30O8, has two chiral centers. As it occupies a special position on the twofold axis in a centrosymmetric group, the crystal represents a racemic mixture of RR and SS enantiomers.

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The title compound, C36H45O6Br3, adopts the rigid `crown' conformation of the parent cyclo­triveratryl­ene (CTV) system and possesses molecular, but not crystallographic, C3 symmetry. The cyclo­triveratryl­ene core is rigid.

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The title compound, C15H11IO4, was synthesized by the N,N'-dicyclo­hexyl­carbodiimide- and 4-dimethyl­amino­pyridine-catalyzed reaction of 3-hydr­oxy-4-methoxy­benzaldehyde and 2-iodo­benzoic acid. In the mol­ecule, the dihedral angle between the two benzene rings is 70.6 (1)°.

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The title compound, [Mg(C3H10NO6P2)2]n, synthesized by a hydro­thermal method, adopts a one-dimensional polymeric chain structure and is isotypic with the previously reported Cd complex based on the ligand N,N-dimethyl­amino­methane-1,1-diphospho­nic acid (H4L). The asymmetric unit contains one half Mg2+ ion and one H3L- anion. The unique Mg2+ ion lies on an inversion center and is octa­hedrally coordinated by O atoms from six phospho­nate groups of four different H3L- anions. Each H3L- anion, with one protonated N atom and two phospho­nate OH groups, serves as a tridentate ligand. Two of its six phospho­nate O atoms chelate to a Mg2+ cation in a bidentate fashion, while a third O atom bridges to a neighbouring Mg2+ ion. The inter­connection of Mg2+ ions by the H3L-anions leads to the formation of a polymer chain along the a axis in which the adjacent Mg2+ ions are doubly bridged by two equivalent H3L- anions. These discrete chains are further assembled into a three-dimensional supra­molecular network via O-H...O and N-H...O hydrogen bonds involving the non-coordin­ated phospho­nate O atoms and the protonated N atoms.

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Two polymorphs of (2-carb­oxy­eth­yl)(phen­yl)­phosphinic acid, C9H11O4P, crystallize in the chiral P212121 space group with similar unit-cell parameters. They feature an essentially similar hydrogen-bonding motif but differ slightly in their detailed geometric parameters. For both polymorphs, the unequivocal location of the hydroxy H atoms together with the expected differences in the P-O bond lengths establish unequivocally that both forms contain the S isomer; the protonated phosphinic acid and carboxy O atoms serve as hydrogen-bond donors, while the second phosphinic acid O atom acts as a double hydrogen-bond acceptor and the remaining carboxy O atom is not involved in hydrogen bonding. Thus, an undulating two-dimensional supra­molecular layer aggregate is formed based on an R43(20) ring unit. Such polymorphism derives from the rotation of the C-C single bonds between the two hydrogen-bond-involved carboxy and phosphi­nic acid moieties.

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In the title compound, (C14H24N2O8)[CdCl4]·4H2O, the Cd atom in the tetra­hedral [CdCl4]2- anion lies on a twofold rotation axis, and the diprotonated organic mol­ecule, trans-N,N,N',N'-tetra­kis(carb­oxy­meth­yl)cyclo­hexane-1,2-diammon­ium, has 2 symmetry with the twofold rotation axis running through the mid-point of two C-C bonds in the cyclo­hexane unit. In the crystal structure, classical intra­molecular O-H...O and N-H...O and inter­molecular O-H...O, N-H...O, O-H...Cl and C-H...Cl hydrogen bonds are observed.

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The title compound, C26H31NO5S, was synthesized by the palladium-catalyzed coupling reaction of 2-(3-bromo-4-methoxy­phenyl)-3,4-di­methyl-5-(3,4,5-tri­methoxy­phenyl)­thio­phene and morpholine. This mol­ecule is composed of four rings. Two benzene rings are linked by a thio­phene moiety which is planar. The morpholine group has a chair conform­ation.

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In the molecule of the title cluster compound, [mu]4-selenido-bis[[mu]-(4-tolylselenido)-hexacarbonyldiiron], two identical ([mu]-4-CH3C6H4Se)Fe2(CO)6 moieties are joined by a spiro-type four-coordinate Se atom, [mu]4-Se. The four Se-Fe bond lengths around the central Se atom are 2.353 (3), 2.353 (3), 2.347 (3) and 2.358 (3) Å. The average (2.353 Å) is shorter than that (2.392 Å) of Se-Fe bond lengths formed between Fe atoms and the 4-tolylselenido ligands. In each diiron subcluster core, the 4-tolylselenido ligand is bridged between two Fe atoms.

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Acta Cryst. (1987). A43, C191
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The title compound, C6H8N4O3·2H2O, which crystallized as a dihydrate, has two almost planar segments viz. the pyrimidine ring and the C-N-C(=O)-C group [maxmum deviations of 0.020 (2) and 0.014 (2) Å, respectively], with a dihedral angle of 87.45°. In the crystal, the components are linked by O-H...O and N-H...O hydrogen bonds.

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The title compound, C13H19N3O2, was obtained by the direct solvent-free reaction of 4-hy­droxy-3-meth­oxy­benzaldehyde with 1-amino-4-methyl­piperazine. The piperazine ring adopts a chair conformation. In the crystal, strong inter­molecular O-H...N and weak inter­molecular C-H...O and C-H...N hydrogen bonds help to establish the packing.

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