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ISSN: 2414-3146

April 2021 issue

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Cover illustration: In the crystal of 3,5-di­bromo-4-carbamoyl­benzoic acid 2-propanol monosolvate, the acid mol­ecules form inversion dimers by pairwise N—H⋯O hydrogen bonds between carbamoyl groups and the carboxyl and carbamoyl groups link to form head-to-tail inversion dimers. The 2-propanol hydroxyl group inter­poses between adjacent head–tail pairs, resulting in C33(10) chains of hydrogen bonds propagating along [100]. The best-fit planes of the carbamoyl group and benzene ring are inclined by 88.26 (11)°. This is a greater inclination than was previously reported with CH3, Cl, F or H in place of the Br atoms, although those analogues did not have a para carboxyl group. See: Noland, Herzig, Fox & Tritch [IUCrData (2021). 6, x210391].

metal-organic compounds


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The cationic ZnII part of aqua­(1,4,7,10-tetra­aza­cyclo­dodeca­ne)zinc(II) diperchlorate, [Zn(C8H20N4)H2O](ClO4)2, exhibits a slightly distorted square-pyramidal coordination environment with a water mol­ecule in the apical position.

organic compounds


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The title pthalamide-substituted thio­hydantoin arose from an unexpected reaction in a deep eutectic di­methyl­thio­urea–tartaric acid solvent system.

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The synthesis and crystal structure of a new Schiff base, namely, 4-bromo-2-[({2-[(2-hy­droxy­eth­yl)amino]­eth­yl}imino)­meth­yl]phenol, is reported.

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The packing of the title compound features weak C—H⋯O and C—H⋯π inter­actions.

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In the crystal of the title compound, the mol­ecules are linked into chains by N—H⋯O hydrogen bonds. The chains are inter­linked by short Cl⋯N contacts.

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The title compound crystallizes with two mol­ecules, A and B, in the asymmetric unit. Each molecule features an intramolecular N—H⋯O hydrogen bond and the same H atom is also involved in an intermolecular N—H⋯S bond to generate A + B dimers. Further N—H⋯O hydrogen bonds link the dimers into a [010] chain.

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The title compound, C6H2N3O7·C10H13Cl2N2+, crystallizes with one 1-(2,3-di­chloro­phen­yl)piperazine cation and one picrate anion in the asymmetric unit. In the crystal structure, the cations and anions are inter­connected via several N—H⋯O and C—H⋯O hydrogen bonds.

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Mol­ecules of the title compound are linked by hydrogen-bond dimerization of the amido group, and a chain of hydrogen bonds between 2-propanol and the carboxyl and amido groups that propagates parallel to [100].

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The title compound is a di­hydro­chloride salt with discrete ionic moieties linked together by extensive hydrogen bonding. Serendipitous water in the lattice aids with the formation of these hydrogen-bonding networks.

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In the title compound, two independent mol­ecules (A and B) are present in the asymmetric unit, with different conformations. The dihedral angle between the mean planes of the carbazole systems for mol­ecule A is 49.1 (2)° compared to 84.0 (1)° for mol­ecule B. In the crystal, numerous aromatic π–π stacking inter­actions [shortest centroid–centroid separation = 3.7069 (19) Å] help to establish the three-dimensional supra­molecular network.

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The centrosymmetric title compound was prepared in five steps from diethyl succinate. The di­propyl­amino groups are almost orthogonal to the central phenyl­enedi­methanol ring system [dihedral angle = 87.62 (9)°]. In the crystal, the mol­ecules are connected by O—H⋯N hydrogen bonds, forming (101) layers separated by the propyl chains.
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