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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Sodium iodine(V) oxyfluoride, NaIO2F2.

Jean Paul Laval1, Nefla Jennene Boukharrata

  • 1Science des Procédés Céramiques et de Traitements de Surface, UMR-CNRS 6638, Faculté des Sciences et Techniques, Université de Limoges, 123 Avenue A. Thomas, Limoges 87060, France. jean-paul.laval@unilim.fr

Acta Crystallographica. Section C, Crystal Structure Communications
|July 5, 2008
PubMed
Summary

The novel sodium iodate fluoride, NaIO(2)F(2), reveals a new crystal structure type. This study details its unique polyhedral sheets and cation ordering, expanding fluoride research.

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Area of Science:

  • Inorganic Chemistry
  • Solid-State Chemistry
  • Crystallography

Background:

  • Previous research focused on tellurium(IV) fluorides and oxyfluorides with stereochemically active lone pairs.
  • Limited structural data exists for related iodine(V) compounds.

Purpose of the Study:

  • To determine the crystal structure of the previously unknown compound NaIO(2)F(2).
  • To characterize the coordination and bonding within the new structure type.
  • To compare the structure with related compounds and explain observed differences.

Main Methods:

  • Single-crystal X-ray diffraction was used to elucidate the crystal structure.
  • Analysis of coordination environments and site symmetries was performed.
  • Comparative structural analysis with known fluoride and oxyfluoride phases.

Main Results:

  • NaIO(2)F(2) exhibits a new structure type characterized by isolated IO(2)F(2)(-) polyhedra forming sheets.
  • Sodium ions are octahedrally coordinated, and the iodine(V) atom possesses a stereochemically active lone pair.
  • Ordered arrangement of oxygen and fluorine atoms around iodine(V) was observed.

Conclusions:

  • The structure of NaIO(2)F(2) is distinct from related KIO(2)F(2) and anion-packing structures.
  • Differences are attributed to the smaller ionic radius of Na(+) and cation ordering.
  • This work expands the understanding of stereochemically active lone pairs in inorganic fluorides.