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ISSN: 2414-3146

November 2022 issue

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Cover illustration: o-Nitro­aniline is known to be polymorphic. The α-form is probably amorphous, while the β- and γ-forms are crystalline. Difficulties with the unit-cell determination of the γ-form were reported as a consequence of twinning. In this raw data letter, newly recorded diffraction data of the γ-form of o-nitro­aniline are described that were processed taking into account the two twin lattices. Data were partly deconvoluted and much better agreement was obtained in terms of R1 values and C—C bond precision. The availability of raw data and proper reprocessing using twin lattices is by far superior to efforts to de-twin processed structure factors. See: Lutz & Kroon-Batenburg [IUCrData (2022). 7, x221059].

raw data letters


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o-Nitro­aniline, C6H6N2O3, is known to be polymorphic. Difficulties with the unit-cell determination of the γ-form were reported as a consequence of twinning. In this paper, newly recorded diffraction data of the γ-form of o-nitro­aniline are described that were processed taking into account the two twin lattices. The availability of raw data and proper reprocessing using twin lattices is by far superior to efforts to de-twin processed structure factors.

metal-organic compounds


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The central magnesium(II) atom exhibits a nearly octa­hedrally arranged N2O4 coordination set from two chelating acetyl­acetonate ligands and one tetra­methyl­ethylenedi­amine ligand.

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The synthesis and single-crystal structure description of a silver(I) diphenyl-p-tolyl­phosphine nitrate complex is described.

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The crystal structure of the title compound consists of a zinc(II) metal center surrounded by two 4-chloro­terpyridine ligands in a distorted octa­hedral geometry with π–π stacking inter­actions contributing to the crystal packing.

organic compounds


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The title salt contains morphilinium cations, which bridge pairs of anions through N—H⋯N and N—H⋯(O,N) hydrogen bonds.

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The asymmetric unit of the title salt, C12H32N42+·2C18HBF15O·2.5C6H6, which crystallizes in the triclinic space group P[\overline{1}], comprises two half [C12H32N4]2+ dications, two [C18HBF15O] anions, and 2.5 mol­ecules of benzene as solvate.


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