Reversible dehydrogenation of magnesium borohydride to magnesium triborane in the solid state under moderate conditions.
Thermal decomposition of magnesium borohydride, Mg(BH(4))(2), in the solid state was studied by a combination of PCT, TGA/MS and NMR spectroscopy. Dehydrogenation of Mg(BH(4))(2) at 200 °C en vacuo results in the highly selective formation of magnesium triborane, Mg(B(3)H(8))(2). This process is reversible at 250 °C under 120 atm H(2). Dehydrogenation at higher temperature, >300 °C under a constant argon flow of 1 atm, produces a complex mixture of polyborane species. A borohydride condensation mechanism involving metal hydride formation is proposed.
Department of Chemistry, University of Hawaii at Manoa, 2545 McCarthy Mall, Honolulu, HI 96822-2275, USA.
Marina
M
Chong
Abhi
A
Karkamkar
Tom
T
Autrey
Shin-ichi
S
Orimo
Satish
S
Jalisatgi
Craig M
CM
Jensen
D001880:Boranes / Q000737:chemistry*; D008274:Magnesium / Q000737:chemistry*; D017616:Magnesium Compounds / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D011312:Pressure; D013696:Temperature
D001880:Boranes; D017616:Magnesium Compounds; D008274:Magnesium