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Iodine heptafluoride

Heptafluoroiodine 2.7 g/cm3 (25 °C)

Iodine heptafluoride is an interhalogen compound with the chemical formula IF7. It has an unusual pentagonal bipyramidal structure, with D5h symmetry, as predicted by VSEPR theory.{{cite journal | hdl-access = free

Below 4.5 °C, IF7 forms a snow-white powder of colorless crystals, melting at 5–6 °C. However, this melting is difficult to observe, as the liquid form is thermodynamically unstable at 760 mmHg: instead, the compound begins to sublime at 4.77 °C. The dense vapor has a mouldy, acrid odour.

Preparation

IF7 is prepared by passing F2 through liquid IF5 at 90 °C, then heating the vapours to 270 °C. Alternatively, this compound can be prepared from fluorine and dried palladium or potassium iodide to minimize the formation of IOF5, an impurity arising by hydrolysis.{{cite journal| title = Iodine Heptafluoride

:2 O2PtF6 + 2 KF + IF5 → 2 KPtF6 + 2 O2 + IF7

Reactions

Iodine heptafluoride decomposes at 200 °C to fluorine gas and iodine pentafluoride.

Safety considerations

IF7 is highly irritating to both the skin and the mucous membranes. It also is a strong oxidizer and can cause fire on contact with organic material.

References

Common sources

References

  1. Pradyot Patnaik. ''Handbook of Inorganic Chemicals''. McGraw-Hill, 2002, {{ISBN. 0-07-049439-8
  2. Macintyre, J. E. (Ed.). (1992). ''Dictionary of Inorganic Compounds'' (Vol. 3). London: Chapman & Hall.
  3. O'Neil, Maryadele J. (Ed.). (2001). ''The Merck Index'' (13th ed.). Whitehouse Station, NJ: Merck.
  4. Lide, David R. (2011). ''[[The CRC Handbook of Chemistry and Physics]]'', 89th ed. p. [[iarchive:crchandbookofche00davi/page/n857/. 4-67]].
  5. {{harvnb. Ruff. Keim. 1930
  6. (1967). "Halogen Chemistry". [[Academic Press]].
  7. Кнунянц, И. Л.. (1990). "Химическая энциклопедия : в пяти томах". Советская Энциклопедия.
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fluorides iodine-compounds interhalogen-compounds oxidizing-agents hypervalent-molecules
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