Towards Y(NH2BH3)3: Probing hydrogen storage properties of YX3/MNH2BH3 (X = F, Cl; M = Li, Na) and YH∼3/NH3BH3 composites

Mixed-metal (Li, Al) amidoborane: synthesis and enhanced hydrogen storage properties

“…7), which are similar to the behaviour of other metallic amidoboranes. [10][11][12][13][14][15][16][17][18][19][20] In particular, upon decomposition, Li 3 AlH 6 -4AB exhibits a small exothermic peak at around 57 C, which is proposed to be the reaction of residual Li 3 AlH 6 (Fig. 1) with ammonia borane, and then a major hydrogen release peak at around 100 C, followed by some small peaks in the region of 116-150 C, consistent with the hydrogen release results from the mass spectra.…”

“…3) show that identical peaks were observed for all the thus-prepared samples, even though there were different molar ratios of Li 3 AlH 6 to AB. The peak positions of the N-H and B-H bonds at around 3150-3350 cm À1 and 2200-2400 cm À1 , respectively, in stretching modes are comparable with those of pure ammonia borane, while the peaks of the bending modes for N-H bonds and B-H bonds are split into two peaks and three peaks, respectively, indicating the complexity of the bonding structure, as well as the reduced structural symmetry of the as-prepared compounds compared with AB, which is also observed for other monometallic amidoboranes 16,17 and NaMg(NH 2 BH 3 ) 3 . 19 In addition, the peak at around 864 cm À1 assigned to the bending mode of the LiAl-H bond was present, 28 providing further evidence for the validity of the incomplete depletion of H atoms when Li 3 AlH 6 reacts with AB during the ball-milling process.…”

Mono- and Bimetalic Amidoboranes

“…11 B NMR spectra of these salts contain a single characteristic signal at ca.´21 ppm (similar to that seen for the parent ammonia borane [18,23,35] On the other hand, the 11 B MAS NMR measurements for the samples in the solid state give one broad peak at about´21 ppm [18,25,29,[38][39][40]43,45]. In Figure 4, we have shown a collection of the 11 B NMR spectra, while, in Table 3, we have listed 11 B NMR chemical shifts and J-coupling constants for various amidoboranes present studied so far.…”

“…Crystal structure of Y(AB) 3 [38] and NaMg(AB) 3 [41] were not solved but their powder X-ray patterns were successfully indexed and fitted using the LeBail method. Crystal structures of other synthesized amidoborane salts have not yet been determined.…”

Li–Na ternary amidoborane for hydrogen storage: experimental and first-principles study

“…[13][14][15][16] Upon replacing one hydrogen atom in NH 3 BH 3 with a metal element, such as Li, Na, K, Ca, Sr or Y atom, metal amidoboranes can be formed. [17][18][19][20][21] Considerable researches have focused on binary alkali-metal amidoboranes, such as lithium amidoborane (LiNH 2 BH 3 , abbreviated as LiAB) and sodium amidoborane (NaNH 2 BH 3 , abbreviated as NaAB). These two chemical hydrides can release ca.…”