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10-[(4-Nitro-phen-yl)ethyn-yl]-10H-pheno-thia-zine.

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Summary

This study details a novel phenothiazine derivative with a unique butterfly-like structure. Its near-planar geometry is attributed to intramolecular charge-transfer interactions, offering insights into molecular design.

Keywords:
crystal structureheterocycle conformation.pheno­thia­zineynamine

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Area of Science:

  • Organic Chemistry
  • Crystallography
  • Materials Science

Background:

  • Phenothiazine derivatives are known for their diverse applications.
  • Understanding the structural and electronic properties of novel derivatives is crucial for developing new materials.
  • Intramolecular charge-transfer interactions can significantly influence molecular geometry and properties.

Purpose of the Study:

  • To synthesize and characterize a novel 10-ethynyl-10H-phenothiazine derivative.
  • To elucidate the three-dimensional structure and conformation of the title compound.
  • To investigate the role of intramolecular charge-transfer interactions in determining the molecule's geometry.

Main Methods:

  • Single-crystal X-ray diffraction analysis was employed to determine the molecular structure.
  • The folding angle of the phenothiazine core and dihedral angles were precisely measured.
  • Computational analysis was considered to explain the observed molecular geometry.

Main Results:

  • The title compound, C20H12N2OS, was successfully synthesized and structurally characterized.
  • The phenothiazine unit exhibits a butterfly conformation with a folding angle of 153.87(7)°.
  • A small dihedral angle of 10.34(5)° was observed between the phenothiazine nitrogen-containing plane and the nitrobenzene ring, indicating near planarity.

Conclusions:

  • The synthesized phenothiazine derivative possesses a distinct butterfly-like structure.
  • The near-planar geometry is effectively explained by significant intramolecular charge-transfer interactions.
  • This structural insight contributes to the understanding of structure-property relationships in phenothiazine compounds.