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This summary is machine-generated.

Researchers synthesized novel cocrystals of bromine pentafluoride (BrF5) and hydrogen difluoride (HF2-) salts for the first time. These new compounds reveal unique coordination structures involving BrF5 molecules and discrete [HF2]- and [H2F3]- anions.

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Area of Science:

  • Inorganic Chemistry
  • Crystallography
  • Solid-State Chemistry

Background:

  • Bromine pentafluoride (BrF5) is a reactive interhalogen compound.
  • Fluoride salts and hydrogen fluoride are known to form complex structures.
  • Previous studies on [Br3F16]- anion revealed propeller-like coordination motifs.

Purpose of the Study:

  • To synthesize and characterize novel cocrystals of BrF5 with HF2- and H2F3- anions.
  • To elucidate the crystal structures and coordination chemistry of these new compounds.
  • To investigate the structural motifs and bonding in the BrF5-HF systems.

Main Methods:

  • Single-crystal X-ray diffraction for structure determination.
  • Quantum chemical calculations for solid-state properties.
  • Raman spectroscopy for vibrational analysis.

Main Results:

  • First-time synthesis of cocrystals [NMe4][(BrF5)6(HF2)] and Cs2[(BrF5)6(HF2)(H2F3)].
  • Crystal structures reveal discrete [HF2]- and [H2F3]- anions coordinated by BrF5 molecules.
  • A recurring propeller-like coordination motif of BrF5 around fluoride atoms was observed.

Conclusions:

  • Novel cocrystal structures involving BrF5 and hydrogen fluoride anions have been successfully synthesized and characterized.
  • The coordination chemistry highlights the ability of BrF5 to act as a Lewis acid coordinating to fluoride anions.
  • The identified structural motifs provide insights into the reactivity and complex formation of interhalogen compounds.