Title: Aluminum Hypophosphite

CAS Registry Number: 7784-22-7

Molecular Formula: AlH6O6P3

Molecular Weight: 221.95

Percent Composition: Al 12.16%, H 2.72%, O 43.25%, P 41.87%

Line Formula: Al(PO2H2)3

Literature 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.