Iodine pentafluoride

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Template:Chembox header | Iodine pentafluoride
Iodine pentafluoride Iodine pentafluoride
Template:Chembox header | General
Systematic name iodine(V) fluoride
Other names iodine pentafluoride
Molecular formula IF5
Molar mass 221.89 g mol−1
Appearance pale yellow liquid
CAS number [7783-66-6]
Template:Chembox header | Properties
Density and phase 3.250 g cm−3 liquid
Solubility in water ? g/100 ml (?°C)
Melting point 9.43°C (282.58 K)
Boiling point 97.85°C (371.00 K)
Acidity (pKa) ?
Basicity (pKb) ?
Viscosity ? cP at ?°C
Template:Chembox header | Structure
Molecular shape tetragonal-pyramidal[1]
Crystal structure monoclinic
point group C2/c
Dipole moment ? D
Template:Chembox header | Hazards
MSDS External MSDS]
Main hazards toxic, oxidizer, corrosive
NFPA 704 Template:NFPA 704
Flash point unflamable
R/S statement R: Template:R8, Template:R14,
RTECS number ?
Template:Chembox header | Supplementary data page
Structure and
n, εr, etc.
Phase behaviour
Solid, liquid, gas
Spectral data UV, IR, NMR, MS
Template:Chembox header | Related compounds
Related compounds Iodine heptafluoride,
Chlorine pentafluoride,
Bromine pentafluoride
Template:Chembox header | Except where noted otherwise, data are given for
materials in their standard state (at 25°C, 100 kPa)
Infobox disclaimer and references

Iodine pentafluoride, IF5, is a fluoride of iodine. It is a colourless or yellow liquid with a density of 3250 kg m−3. It was first synthesized by Henri Moissan in 1891 by burning solid iodine in fluorine gas.[2] This exothermic reaction is still used to produce iodine pentafluoride, although the reaction conditions have been improved.[3][4]

I2 + 5 F2 → 2 IF5


Iodine pentafluoride is a strong fluorination agent and is highly oxidative. It reacts vigorously with water forming hydrofluoric acid.

Primary amines react with iodine pentafluoride forming nitriles after hydrolysis with water.[5]

R-CH2-NH2 → R-CN


  1. R. D. Durbank, G. R. Jones (1974). "Crystal structure of iodine pentafluoride at -80.deg". Inorganic Chemistry. 13 (5): 421–439. doi:10.1021/ic50135a012.
  2. M. H. Moissan (1891). "Nouvelles Recherches sur le Fluor". Annales de chimie et de physique. 6: 224–282.
  3. Otto Ruff , Keim R. (1930). ""Das Jod-7-fluorid" (The iodine-7-fluoride)". Zeitschrift für Anorganische un Allgemeine Chemie. 193 (1/2): 176–186. doi:10.1002/zaac.19301930117.
  4. Ruff O., Keim R. (1931). "Fluorierung von Verbindungen des Kohlenstoffs (Benzol und Tetrachlormethan mit Jod-5-fluorid, sowie Tetrachlormethan mit Fluor)". Zeitschrift für Anorganische un Allgemeine Chemie. 201 (1): 245–258. doi:10.1002/zaac.19312010122.
  5. T. E. Stevens (1966). "Rearrangement of Amides with Iodine Pentafluoride". Journal of Organic Chemistry. 31 (6): 2025–2026. doi:10.1021/jo01344a539.

External links

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