Nomenclature
CAS number: 12027-06-4
Ammonium iodide ((NH
4)I).
H
4IN; mol wt 144.94.
H 2.78%, I 87.56%, N 9.66%.
NH
4I.
Description and references
Prepd from ammonia, iodine and hydrogen peroxide;
from ammonia and hydrogen iodide; or from ammonium carbonate and hydrogen
iodide: Wulff, Cameron, Z. Phys. Chem. B10, 350 (1930); Schmeisser in Handbook of Preparative Inorganic Chemistry vol.
1, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1963)
p 289. Review: Richards “Ammonium Iodide” in Mellor's vol. VIII, Supplement
I, Nitrogen (part 1) 448-458 (1964). IR reflection spectra
at high pressure: A. H. Abdullah, W. F. Sherman, Vib. Spectrosc. 13, 155 (1997).
Phase diagram: S. Salihoglu et al., Mater. Chem. Phys. 73, 339 (2002). Use as
iodine source in oxyiodination reactions: K. V. V. Krishna Mohan et al., Tetrahedron Lett. 45, 8015 (2004).
Properties
White, odorless, very hygroscopic, tetragonal
crystals or granular powder, sharp saline taste. Becomes yellow to
brown on exposure to air and light because of liberation of iodine.
When heated it partly decomposes and partly sublimes. d25 2.5142. One gram dissolves
in 0.6 ml water, 0.5 ml boiling water, 3.7 ml alc, 1.5 ml glycerol,
2.5 ml methanol. Except in the presence of a stabilizer, such as
ammonium hypophosphite, the aq soln will quickly become yellow. The
aq soln is nearly neutral to litmus. pH of 0.1M soln about
4.6. Keep tightly closed and protected from
light.Use
In photochemical reactions.