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September 2014 issue
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-HO=C hydrogen bonds between the benzene rings and the carbonyl groups and C-HO=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.
CCDC reference: 1016995
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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.
CCDC reference: 1017486
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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.
CCDC reference: 1017369
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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.
CCDC reference: 962784
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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.
CCDC reference: 1017949
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Crystal structure of magnesium selenate heptahydrate, MgSeO4·7H2O, from neutron time-of-flight data
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.
CCDC reference: 1019812
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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.
CCDC reference: 1019755
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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.
CCDC reference: 1017896
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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.
CCDC reference: 1020373
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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), which are linked via C—H⋯F hydrogen bonds and C—H⋯π interactions, forming a three-dimensional structure.
CCDC reference: 1021159
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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.
CCDC reference: 1019479
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