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1. Crystal structure of N , N -diisopropyl-4-methylbenzenesulfonamide

   https://doi.org/10.1107/S2056989020007185  

   Stenfors, Brock A.; Staples, Richard J.; Biros, Shannon M.; Ngassa, Felix N. (July 2020, Acta Crystallographica Section E Crystallographic Communications)

   The synthesis of the title compound, C 13 H 21 NO 2 S, is reported here along with its crystal structure. This compound crystallizes with two molecules in the asymmetric unit. The sulfonamide functional group of this structure features S=O bond lengths ranging from 1.433 (3) to 1.439 (3) Å, S—C bond lengths of 1.777 (3) and 1.773 (4) Å, and S—N bond lengths of 1.622 (3) and 1.624 (3) Å. When viewing the molecules down the S—N bond, the isopropyl groups are gauche to the aromatic ring. On each molecule, two methyl hydrogen atoms of one isopropyl group are engaged in intramolecular C—H...O hydrogen bonds with a nearby sulfonamide oxygen atom. Intermolecular C—H...O hydrogen bonds and C—H...π interactions link molecules of the title compound in the solid state. 

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2. Crystal structure of 4-bromo-5,7-dimethoxy-2,3-dihydro-1 H -inden-1-one

   https://doi.org/10.1107/S2056989024006522  

   Galla, Sri Hari; Sridhar, Jayalakshmi; Mague, Joel T; Zhang, Xiaodong; White, Kira D; Zhang, Qiang; Donahue, James P (August 2024, Acta Crystallographica Section E Crystallographic Communications)

   In the title molecule, C₁₁H₁₁BrO₃, the dihydroindene moiety is essentially planar but with a slight twist in the saturated portion of the five-membered ring. The methoxy groups lie close to the above plane. In the crystal, π-stacking interactions between six-membered rings form stacks of molecules extending along thea-axis direction, which are linked by weak C—H...O and C—H...Br hydrogen bonds. A Hirshfeld surface analysis was performed showing H...H, O...H/H...O and Br...H/H...Br contacts make the largest contributions to intermolecular interactions in the crystal. 

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3. Crystal structures, phase transition, and Hirshfeld surface analyses of the bromide and chloride congeners of aqua[2,4,6-tris(pyridin-4-yl)-1,3,5-triazine]zinc(II) halide

   https://doi.org/10.1107/S205322962400737X  

   Dailey, Maegan; Jackson, Eric W; Ramadhar, Timothy R (September 2024, Acta Crystallographica Section C Structural Chemistry)

   During the course of exploring crystallization conditions in generating metal–organic frameworks (MOFs) for use in the crystalline sponge method, two discrete metal–organic complexes, namely, aqua[2,4,6-tris(pyridin-4-yl)-1,3,5-triazine]zinc(II) bromide, [Zn(C₁₈H₁₂N₆)(H₂O)]Br₂, and aqua[2,4,6-tris(pyridin-4-yl)-1,3,5-triazine]zinc(II) chloride, [Zn(C₁₈H₁₂N₆)(H₂O)]Cl₂, were encountered. Structures in the orthorhombic space groupPnma(No. 62) for the bromide congener at 299 K and the chloride congener at 100 K were obtained. A phase transition for the bromide congener occurred upon cooling from 299 to 100 K, yielding a crystal polymorph with four domains that exhibits monoclinicP2₁/mspace-group symmetry (No. 11), which arises from conformational changes. The main intramolecular contacts that contribute to the crystal packing in all observed structures are H...H, Halide...H/H...Halide, C...H/H...C, and N...H/H...N. Intramolecular hydrogen bonding between the Zn-bound water and non-Zn-bound pyridyl N atoms is a prominent feature within the three-dimensional networks. Aromatic π-stacking between the non-Zn-bound pyridine rings and contacts involving the halide ligands further stabilize the crystal packing. 

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4. 1-Methyl-5-nitroimidazolium chloride

   https://doi.org/10.1107/S2414314622008781  

   Bellia, Sophia; Anderson, Grace; Zeller, Matthias; Mirjafari, Arsalan; Hillesheim, Patrick C. (September 2022, IUCrData)

   The title salt, C 4 H 6 N 3 O 2 + ·Cl − , exhibits multiple hydrogen-bonding interactions involving the nitroimidazolium cation and the chloride anion. Strong hydrogen bonds between the amine hydrogen atom and the chloride anion link the ionic moieties. Of note, with respect to H...Cl interactions, the central aromatic hydrogen atom displays a shorter interaction than the other aromatic hydrogen atom. Finally, interactions are observed between the nitro moiety and methyl H atoms. While no π–π stacking is observed, anion-π interactions are present. The crystal was refined as a two-component twin. 

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5. Crystal structure of N -allyl-4-methylbenzenesulfonamide

   https://doi.org/10.1107/S2056989018010290  

   Patel, Zeel S.; Stevens, Amanda C.; Bookout, Erin C.; Staples, Richard J.; Biros, Shannon M.; Ngassa, Felix N. (August 2018, Acta Crystallographica Section E Crystallographic Communications)

   The title compound, C 10 H 13 NO 2 S, was synthesized by a nucleophilic substitution reaction between allyl amine and p -toluenesulfonyl chloride. The sulfonate S—O bond lengths are 1.4282 (17) and 1.4353 (17) Å, and the C—N—S—C torsion angle involving the sulfonamide moiety is −61.0 (2)°. In the crystal, centrosymmetric dimers of the title compound are present via intermolecular N—H...O hydrogen bonds between sulfonamide groups. These dimers are linked into ribbons along the c -axis direction through offset π–π interactions. 

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