Nomenclature
CAS number: 12125-09-6
H
4IP; mol wt 161.91.
H 2.49%, I 78.38%, P 19.13%.
PH
4I.
Description and references
Prepd by hydrolysis of a mixture of diphosphorus
tetraiodide and white phosphorus: Work, Inorg.
Synth. 2, 141 (1946). Improved apparatus for
its prepn: Beredjick, ibid. 6, 91 (1960).
Properties
Large, transparent, colorless crystals (usually
cubes). Tetragonal system. Sublimes at room temp. Store in sealed ampuls in refrigerator. Vapor
pressure: 50 mm at 20°; 760 mm at 62.5°. mp 18.5° under its own vapor pressure. Heat
of fusion 12,680 cal/mol. Caution: Heat or traces of
moisture or alcohol cause decompn into PH3 and HI. Will
detonate if heated rapidly.Use
In the laboratory prepn of phosphine.