On the Alkali Metal Salts Derived from the Diammoniate of Diborane¹

The diammoniate of diborane: crystal structure and hydrogen release

“…There are two crystallographically distinct BH 4 À sites which coordinate with neighbouring (NH 3 ) 2 BH 2 + ions in different ways. This accounts for the two signals seen in the 11 B solid-state MAS NMR spectrum in the BH 4…”

“…The crystal structure of DADB was solved from a combination of X-ray and neutron powder diffraction patterns using the Rietveld refinement programme TOPAS (V4.2, Bruker AXS). For neutron diffraction, an isotopically enriched sample containing 11 B and D was prepared. A tetragonal unit cell (a = 10.721 A ˚, c = 9.241 A ˚) was determined by trial and error indexing, similar to that of the nearest reported compound [(NH 3 ) 2 BH 2 ] + Cl À .…”

Ammonia–borane: the hydrogen source par excellence?

“…77 In contrast to the cyclic aminoborane oligomers, [H 2 NBH 2 ] n undergoes rapid hydrolysis and its dissolution in liquid ammonia generates H 2 and HB(NH 2 ) 2 . 78 While there are many reports of the synthesis of [H 2 NBH 2 ] n , the polymer microstructure is not well understood. Since methods as varied as thermolysis and catalyzed dehydropolymerization (vide infra) result in formation of [H 2 NBH 2 ] n , it is likely that there are structures including linear, branched, and cyclic oligomers.…”

Synthesis and characterization of poly(aminoborane) as a new boron nitride precursor

“…It is known that polymeric NH 2 BH 2 can be formed by subjecting borazine vapor to a radio frequency (RF) discharge [7] or vapor phase pyrolysis of ammonia±borane (H 3 N BH 3 ) [8]. In addition, it has been reported that borazine could be synthesized from pyrolysis of ammonia±borane (H 3 NÁBH 3 ) [9] or B 2 H 6 Á2NH 3 [10]. These reports suggested that the linear ammonia±borane must be converted into a ring structure of borazine or vice versa under some conditions.…”