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Benzoin 4-ethylthiosemicarbazone.

Muharrem Dinçer1, Namik Ozdemir, Alaaddin Cukurovali

  • 1Department of Physics, Arts and Sciences Faculty, Ondokuz Mayis University, 55139 Samsun, Turkey.

Acta Crystallographica. Section C, Crystal Structure Communications
|January 7, 2006
PubMed
Summary

This study details the crystal structure of 2-hydroxy-1,2-diphenylethanone 4-ethylthiosemicarbazone. The research highlights its planar thiosemicarbazone moiety, E configuration, and specific intermolecular interactions, including hydrogen bonds and pi-stacking.

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Area of Science:

  • Crystallography
  • Organic Chemistry
  • Supramolecular Chemistry

Background:

  • Thiosemicarbazones are a class of organic compounds with diverse biological activities.
  • Understanding the solid-state structure of thiosemicarbazone derivatives is crucial for structure-activity relationship studies.
  • The specific compound 2-hydroxy-1,2-diphenylethanone 4-ethylthiosemicarbazone has not been previously characterized in detail.

Purpose of the Study:

  • To elucidate the crystal structure of 2-hydroxy-1,2-diphenylethanone 4-ethylthiosemicarbazone.
  • To analyze the molecular geometry, including planarity and dihedral angles.
  • To identify and characterize intermolecular interactions governing crystal packing.

Main Methods:

  • Single-crystal X-ray diffraction was employed to determine the three-dimensional structure.

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  • Crystallographic data were collected and refined to high precision.
  • Analysis of hydrogen bonding and non-covalent interactions was performed.

    • Main Results:

    • The thiosemicarbazone moiety was found to be planar with an E configuration.
    • Phenyl rings exhibited dihedral angles of 82.34 (8) and 8.07 (17) degrees relative to the thiosemicarbazone plane.
    • The crystal structure features intramolecular (N-H...O, N-H...N) and intermolecular (O-H...S) hydrogen bonds, alongside C-H...pi(benzene) interactions.
    • Molecules are arranged in columns along the a axis, stabilized by O-H...S hydrogen bonds and C-H...pi interactions.

    Conclusions:

    • The crystal structure of 2-hydroxy-1,2-diphenylethanone 4-ethylthiosemicarbazone has been successfully determined.
    • The observed planarity and specific dihedral angles provide insights into the electronic and steric properties of the molecule.
    • Intermolecular interactions, particularly hydrogen bonding and pi-stacking, play a significant role in the self-assembly and crystal packing of this compound.