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Non-covalent interactions in solid p-C6F4Cl2 and C6F5Cl.

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Chloropentafluorobenzene exhibits three solid-state phases and a reversible solid-solid transition, unlike para-dichlorotetrafluorobenzene. This study explores organofluorine aromatic compounds and their phase behaviors.

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Area of Science:

  • Solid-state chemistry
  • Crystallography
  • Materials science

Background:

  • Organofluorine aromatic compounds are crucial in various chemical applications.
  • Understanding their solid-state properties is key to designing new materials.
  • Halogen substitution significantly influences molecular interactions and phase behavior.

Purpose of the Study:

  • To investigate the crystal structure and solid-state phase transitions of para-dichlorotetrafluorobenzene and chloropentafluorobenzene.
  • To analyze the role of non-covalent interactions in their phase behavior.
  • To compare the solid-state structures of related halogenated hexafluorobenzenes.

Main Methods:

  • Differential scanning calorimetry (DSC) for thermal analysis.
  • Variable-temperature powder X-ray diffraction (VT-PXRD) for structural studies.
  • Single-crystal X-ray diffraction (SXD) for detailed structural determination.

Main Results:

  • Para-dichlorotetrafluorobenzene displayed no solid-state phase transitions.
  • Chloropentafluorobenzene exhibited three distinct solid-state phases.
  • A reversible solid-solid transition in chloropentafluorobenzene was linked to molecular dipole ordering.

Conclusions:

  • Chloropentafluorobenzene's phase transitions are driven by changes in molecular arrangement and dipole ordering.
  • Phase II of chloropentafluorobenzene is isomorphous with para-dichlorotetrafluorobenzene.
  • The study provides insights into structure-property relationships in organofluorine compounds.