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ISSN: 2414-3146

September 2018 issue

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Cover illustration: Re-refinement of the crystal structure against the original X-ray intensity data after correct placement of the donor H atoms proves that `bis glycine' squaric acid is in fact the previously reported diglycinium squarate. See: Seidel [IUCrData (2017). 3, x181324].

metal-organic compounds


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The crystal structure of the title salt is composed of alternating rows of bis­(2-(amino­meth­yl)pyridine-κ2N,N′)platinum(II) cations and hexa­fluorido­phosphate anions.

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The central ZnII cation has a distorted tetra­gonal N2O2 coordination sphere defined by two monodentate p-chloro­phen­oxy­acetate ligands and a chelating ethyl­enedi­amine ligand.

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The title compound, is a cobalt(III) dibromide complex having two (ethyl­ene-1,2-di­amine) ligands coordinating cis to each other.

organic compounds


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The asymmetric unit of the compound contains two independent mol­ecules with different orientations about the hydrazone bond. The mol­ecular packing features N—H⋯O hydrogen bonds that lead to a twisted supra­molecular chain along the b-axis direction.

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The asymmetric unit of the title compound comprises one half-mol­ecule, the other half being generated by a center of inversion. The piperidine ring adopts a chair conformation. A short intra­molecular C—H⋯N hydrogen bond stabilizes the mol­ecule and forms an S(6) motif.

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The synthesis and crystal structure of a biologically important pharmacophore containing flavone is reported.

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In the title compound, the seven-membered ring has a twisted envelope conformation and the saturated six-membered ring a chair conformation. In the crystal, N—H⋯O, N—H⋯S, O—H⋯S hydrogen bonds and C—H⋯π inter­actions link both main and solvent mol­ecules into layers lying parallel to (101).

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The (di­methyl­amino)­phenyl ring and the chromanone ring system are linked via an α-β unsaturated carbon bridge. The dihedral angle between the two terminal phenyl rings is 29.66 (6)°. The tetra­hydro-4H-pyran-4 one ring in the chromanone moiety adopts a sofa conformation.

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The indene and thia­zole rings adopt an envelope conformation while the pyrrole ring adopts a twisted conformation. The crystal structure is stabilized by inter­molecular C—H⋯·O and C—H⋯·N hydrogen bonds.

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The synthesis and crystal structure of a biologically important pharmacophore containing flavonol is reported.

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The fused ring system in 8,9-di­meth­oxy­benzo[b]naphtho­[2,3-d]thio­phene is almost planar.

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The fused triazolo­pyrimidine ring system of the title mol­ecule is planar with the pent-4-enoate substituent nearly orthogonal to it. In the crystal, inversion-related C—H⋯O hydrogen bonds form dimers which are linked into chains extending along the a-axis direction by inversion-related C—H⋯π(ring) inter­actions.

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The morpholine ring of the title compound adopts a chair conformation with the exocyclic N—C bond in an equatorial orientation.

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The crystal structure of C27H22N4O2 is characterized by N—H⋯N hydrogen bonds connecting the mol­ecules into zigzag chains running along the b-axis direction.

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Re-refinement of the crystal structure against the original diffraction data after correct H-atom placement proves that `bis glycine' squaric acid is in fact the previously reported diglycinium squarate.

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The title compound, C6H10N3O2+·I, contains a protonated L-histidine mol­ecule as cation and an iodine anion. The crystal packing is controlled by inter­molecular N—H⋯O and N—H⋯I hydrogen bonds.

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The crystal structure the title compound has a two-dimensional layer structure.

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The title compound crystallizes in two-dimensional sheets in which 2-(pent­yloxy)dibenzo[b,d]furan mol­ecules are arranged in a head-to-head and tail-to-tail fashion that enables hydro­phobic inter­actions between fully extended 2-pent­oxy chains and π–π stacking between dibenzo­furan rings in adjacent rings.

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Three independent but conformationally similar mol­ecules, showing intra­molecular N—H⋯O hydrogen-bonded ring formation, are present in the asymmetric unit. In the crystal, C—H⋯O inter­actions give rise to a supra­molecular sheet structure.
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