Accession Number : AD0256887

Title :   REACTIONS OF ALUMINUM BOROHYDRIDE

Corporate Author : EASTERN NAZARENE COLL WOLLASTON MASS

Personal Author(s) : MAYBURY,P. CALVIN

Report Date : 20 APR 1961

Pagination or Media Count : 1

Abstract : KINETICS OF THE EXCHANGE REACTION OF AL(BH4)3 WITH D2: Preliminary studies indicated a drift in exchange rates as calculated by the exchange law, especially for those runs where the ratio of D2 to Al(BH4)3 pressure was large. The assumption was made that the drift was due to the contribution of 2 different mechanisms proceeding at different rates. DEUTERIUM EXCHANGE BETWEEN B2D6 and AL(BH4)3: The kinetics of the exchange were studied from -70 to 20 C. The orders of reaction were dependent on the relative proportions of B2D6 and Al(BH4)3. A mechanism was proposed involving the thermal dissociation of both Al(BH4)3 and B2D6 followed by a rate determining collision of B2D6 with borane radicals. Evidence was obtained proving that the B atoms undergo exchange in this reaction by the use of B-10-enriched B2D6. THE REACTION OF AL(BH4)3 WITH NH3: The Al(BH4)3-NH3 reaction product was obtained as a uniform white amorphous appearing powder which dissolved in cold water with slow gas evolution. The solid was ignited with a laboratory burner flame and burned smoothly with a green flame. IR spectroscopy indicated that some B-H bonds remain intact in the ammoniated Al(BH4)3.

Descriptors :   *ALUMINUM COMPOUNDS, *AMMONIA, *BOROHYDRIDES, *BORON COMPOUNDS, *DEUTERIUM COMPOUNDS, *DIBORANES, *EXCHANGE REACTIONS, CHEMICAL REACTIONS, DEUTERIUM, HYDROGEN, ISOTOPES, REACTION KINETICS

Distribution Statement : APPROVED FOR PUBLIC RELEASE