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Journal logoIUCrDATA
ISSN: 2414-3146

October 2021 issue

Highlighted illustration

Cover illustration: The single-crystal structure of 1,3,5-tri­fluoro-2,4,6-tri­iodo­benzene–piperazine (2/1) features a moderately strong halogen bond between one of the three crystallographically distinct iodine atoms and the nitro­gen atom. The iodine–nitro­gen distance is 2.820 (3) Å, corresponding to 80% of the sum of their van der Waals radii. The C—I⋯N halogen bond angle is 178.0 (1)°, consistent with the linear inter­action of nitro­gen via a σ-hole opposite the carbon–iodine covalent bond. The other two iodine atoms do not engage in halogen bonding. Some weak C—H⋯F and C—H⋯I interactions are also observed. See: Hajjar, Ovens & Bryce [IUCrData (2021). 6, x210951].

metal-organic compounds


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The title di­chloro­cobalt(II) complex has a CoII center that exhibits a distorted octa­hedral coordination geometry and is coordinated by two N and two S atoms from the bidentate N,S-ligand situated in the equatorial plane and two Cl atoms in the axial positions.

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The reaction of silver(I) triflouro­methane­sulfonate with isonicotinamide in aceto­nitrile produces a polymeric structure held together by discrete hydrogen bonds, regium bonds between the metal atom and the solvent mol­ecules, and metal–metal inter­actions.


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The crystal structure of the centrosymmetric complex [Cu(terpy)2Cl2](OTF)2 consists of a CuII metal center in a distorted square-pyramidal geometry with ππ stacking inter­actions contributing to the crystal packing.

organic compounds


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The single-crystal structure of the title compound features a moderately strong halogen bond between one of the three crystallographically distinct iodine atoms and the nitro­gen atom. The other two chemically identical iodine atoms do not engage in halogen bonding.

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The title compound, C24H17Cl2N, crystallizes with a single mol­ecule in the asymmetric unit. In the crystal, van der Waals inter­actions are responsible for the observed packing structure.

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The solid-state structure of dimethyl 4,5-di­chloro­phthalate is presented. One of the carbonyl-containing ester groups is nearly co-planar with the aromatic ring while the second deviates considerably from the least-squares plane of its chlorine-derivatized aromatic ring. Solid-state integrity is maintained by both electrostatic inter­actions and C—HO hydrogen bonds.

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The title compound is a pyridinium salt that consists of a sulfonated pyridine N-oxide cation and a methane­sulfonate anion.

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In the crystal, the mol­ecules are linked by N—H⋯N and C—H⋯S hydrogen bonds.

addenda and errata


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