issue contents

Journal logoCRYSTALLOGRAPHIC
COMMUNICATIONS
ISSN: 2056-9890

September 2014 issue

Highlighted illustration

Cover illustration: The molecular structure of 2,7-diethoxy-1,8-bis(4-nitrobenzoyl)naphthalene possesses crystallographically imposed twofold symmetry with two C atoms lying on the rotation axis. The crystal packing is characterized by C-H...O=C hydrogen bonds between the benzene rings and the carbonyl groups and C-H...O=N hydrogen bonds between the benzene rings and the nitro groups. See: Mohri, Ohisa, Noguchi, Yonezawa & Okamoto [Acta Cryst. (2014). E70, 138-141].

research communications


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The mol­ecular structure of [HgCl2(C12H20N2)] is a rare example where the HgII atom is bound to a Cl2N2 donor set for which the N atoms originate from aliphatic tertiary amine groups.

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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.

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In the title compound the four-fused-rings system is approximately planar and the pyrrolidine rings of the pyrrolidizine fragment adopt a twist conformation. In the crystal, mol­ecules are linked by C—H⋯O hydrogen bonds and C—H⋯π inter­actions, forming double-chains parallel to the c axis.

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In the title compound, the pyran and pyrone rings adopt slightly distorted half-chair and envelope conformations, respectively. In the crystal, C—H⋯O and π–π inter­actions connect the mol­ecules, forming double layers that stack along the c-axis direction.

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The structure of a TEMPO derivative with a propyn­yloxy substituent at the 4-position of the piperidine ring is reported. The crystal packing features an unusual C—H⋯π inter­action involving the triple bond of the propyne group which combines with C—H⋯O hydrogen bonds to stack the mol­ecules along the b-axis direction.

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The structure of MgSeO4·7H2O has been determined by single-crystal Laue diffraction methods using pulsed neutron radiation. The compound is isostructural with the sulfate analogue, MgSO4·7H2O.

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The title compound possesses crystallographically imposed twofold symmetry with two C atoms lying on the rotation axis and has a non-coplanarly accumulated aromatic-rings structure. In the crystal, C—H⋯O=C hydrogen bonds between the benzene rings and the carbonyl groups and C—H⋯O=N hydrogen bonds between the benzene rings and the nitro groups are observed; these C—H⋯O hydrogen bonds link the mol­ecules, forming a three-dimensional structure.

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In this CdII complex incorporating two monodentate acetate groups and two N,N′-chelating pyridine-2-carboxamide oxime ligands, mol­ecules are assembled into chains along the c axis via N—H⋯O hydrogen bonding. The resulting chains are further assembled by ethanol solvent mol­ecules into a three-dimensional supermolecular structure.

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In the title compound, the bicyclic ring system adopts a twin-chair conformation. In the crystal, N—H⋯O, C—H⋯O and C—H⋯F inter­actions connect the mol­ecules, forming supra­molecular chains propagating along the b-axis direction.

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Chromium(III) complexes of two ethyl­ene cross-bridged tetra­aza­macrocycles were prepared and structurally characterized in order to extend the coordination chemistry of this ligand type farther towards the early transition metals.

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In the title compound, the 1,2,3,4-tetra­hydro­pyridine ring of the quinoline moiety adopts a half-chair conformation while the pyrrolidine ring has an envelope conformation. In the crystal, mol­ecules are linked by N—H⋯O and C—H⋯O hydrogen bonds, forming sheets lying parallel to (10\overline{1}), which are linked via C—H⋯F hydrogen bonds and C—H⋯π inter­actions, forming a three-dimensional structure.

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A distinctive feature of the crystal structure is the geometry of the dtba moiety, which appears to be stretched and acts as an hydrogen-bonding connector, forming linear chains along [-211] with the 4,4′-bpy moiety by way of O—H⋯N hydrogen bonds and C—H⋯O interactions. The influence of the mol­ecular shape on the hydrogen-bonding pattern is analysed by comparing the title compound and two other 4,4′-bpy co-crystals, showing the way in which this correlates with the packing arrangement.

data reports

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Acta Cryst. (2014). E70, o932
doi: 10.1107/S160053681401633X