Preparation of aluminoborane analogs of the lower boron hydrides

Aluminium Atoms at High Connectivity Sites in Polyhedral Polyborane Analogous Clusters: From Aluminaboranes to Carbaalanes

“…[25] The structures of these compounds are un-B 4 (CMe 3 ) 4 , [9] will not be considered here as they do not fit in the classic scheme of ordering in borane or carbaborane certain, although a polymeric structure with AlϪH bridges was suggested from some physical and chemical properties. chemistry.…”

Study of Aluminoborane Compound AlB4H11 for Hydrogen Storage

“…This procedure allows diborane to be safely stored in the cylinder and to be conveniently separated (and accurately measured) from the hydrogen. It was found (as was discussed by Himpsl 4,7 ) that a 1.2 atm pressure of diborane in the reaction vessel was necessary for the product to form.…”

“…However, desorption temperatures, reversibility, and diborane formation during desorption are challenging issues for these materials. 3 The aluminoborane compounds AlB 4 H 11 , AlB 5 H 12 , and AlB 6 H 13 have been reported only in a paper by Himpsl and Bond, 4 but these hydrides have very attractive properties for hydrogen storage. First, their very high total hydrogen contents of 13.5, 12.9, and 12.4 wt % H, respectively, have the potential to meet the DOE 2010 storage system targets.…”

Structure determination of an amorphous compound AlB4H11

“…The aluminoborane compound AlB 4 H 11 was first prepared in 1981 by Himpsl and Bond from a reaction between Al(BH 4 ) 3 and B 2 H 6 at 100 C. 1 This synthesis was reproduced about a quarter of a century later by Zhao et al in search of high-capacity hydrogen storage materials. 2 AlB 4 H 11 is an amorphous white solid at ambient temperature with several properties that are attractive for hydrogen storage: (1) a high hydrogen content of 13.5 mass %, (2) moderate stability with a decomposition temperature around 125 C, (3) release of predominantly hydrogen in the desorbed gas, (4) endothermic desorption which is thermodynamically essential for rehydrogenation, and (5) partial rehydrogenation at moderate conditions (which is relatively rare for borane compounds).…”

“…2 A structure proposed by Himpsl and Bond based on the analogue to pentaborane (B 5 H 11 ) is inconsistent with the IR and 11 B NMR spectra of AlB 4 H 11 . 1,2 Hence, the determination of the AlB 4 H 11 structure is significant for the understanding of its stability and hydrogenation/dehydrogenation properties.…”