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1. Crystal structure of 1 H -imidazole-1-methanol

   https://doi.org/10.1107/S2056989022002614  

   Wysocki, Megan M.; Puzovic, Gorana; Dowell, Keith L.; Reinheimer, Eric W.; Gerlach, Deidra L. (April 2022, Acta Crystallographica Section E Crystallographic Communications)

   The synthesis and the crystal structure of 1 H -imidazole-1-methanol, C 4 H 6 N 2 O, are described. This compound comprises an imidazole ring with a methanol group attached at the 1-position affording an imine nitrogen atom able to receive a hydrogen bond and an alcohol group able to donate to a hydrogen bond. This imidazole methanol crystallizes with monoclinic ( P 2 1 / n ) symmetry with three symmetry-unique molecules. These three molecules are connected via O—H...N hydrogen bonding in a head-to-tail configuration to form independent three-membered macrocycles. 

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2. Crystal structure of 1-(2,6-diisopropylphenyl)-1 H -imidazole

   https://doi.org/10.1107/S2056989023009179  

   Dudeja, Neil; Arreaga, Briana C; Brannon, Jacob P; Stieber, S_Chantal E (November 2023, Acta Crystallographica Section E Crystallographic Communications)

   The crystal structure of the title compound, C₁₅H₂₀N₂or^DippIm, is reported. At 106 (2) K, the molecule has monoclinicP2₁/c symmetry with four molecules in the unit cell. The imidazole ring is rotated 80.7 (1)° relative to the phenyl ring. Intermolecular stabilization primarily results from close contacts between the N atom at the 3-position on the imidazole ring and the C—H bond at the 4-position on the neighboring^DippIm, with aryl–aryl distances outside of the accepted distance of 5 Å for π-stacking. 

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3. 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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4. Crystal and molecular structure of 4-fluoro-1 H -pyrazole at 150 K

   https://doi.org/10.1107/S2056989023003055  

   Ahmed, Basil M.; Zeller, Matthias; Mezei, Gellert (May 2023, Acta Crystallographica Section E Crystallographic Communications)

   Only two 4-halo-1H-pyrazole crystal structures are known to date (chloro and bromo, the structure of 4-iodo-1H-pyrazole has not been reported yet). The triclinic structure of 4-fluoro-1H-pyrazole, C₃H₃FN₂(P\overline{1}), reported here is not isomorphous with those of the chloro and bromo analogues (which are isomorphous, orthorhombicPnma). To avoid sublimation during the measurement, diffraction data were collected at 150 K. Two crystallographically unique 4-fluoro-1H-pyrazole moieties linked by an N—H...N hydrogen bond are found in the asymmetric unit. Unlike the trimeric supramolecular motifs found in the structures of the chloro and bromo analogues, 4-fluoro-1H-pyrazole forms one-dimensional chains by intermolecular hydrogen bonding in the crystal. 

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5. Microwave Spectrum and Novel Molecular Structure of ( Z )-1-Chloro-3,3,3-trifluoropropene–Acetylene

   https://doi.org/10.1021/acs.jpca.3c03517  

   Leung, Helen O.; Marshall, Mark D.; Hong, Seohyun (August 2023, The Journal of Physical Chemistry A)