345. Aluminum Hypophosphite

Nomenclature

CAS number: 7784-22-7
AlH6O6P3; mol wt 221.95.
Al 12.16%, H 2.72%, O 43.25%, P 41.87%.
Al(PO2H2)3.

Description and references

Prepd by heating Al(OH)3 or a solution of an aluminum salt with hypophosphorous acid or sodium hypophosphite: Everest, J. Chem. Soc. 1952, 2945.

Properties

Cryst powder; decomposes without melting at ≈220° with evolution of phosphine. Practically insol in water. Sol in warm NaOH soln, dilute sulfuric and dilute or concd hydrochloric acid.

Use

In acrylonitrile polymer fiber finishes.