The assignment of 11B and 1H resonances in the post-reaction mixture from the dry synthesis of Li(BH3NH2BH2NH2BH3)

We report a detailed H-1 NMR and B-11 NMR study of as synthesised Li(BH3NH2BH2NH2BH3) obtained in a novel dry-synthesis method. A combination of 1D and 2D single- and triple-quantum techniques was used for the assignment of all observed signals. Minor side-products and reactants were detected in the product: NH3BH3, Li(NH2BH3), Li(BH4), and two yet unknown salts containing 7-membered chain anions: (BH3NH2BH2NH2BH2NH2BH3)(-) and (BH(NH2BH3)(3))(-). We believe the assignment provided within this study might be helpful when analysing the mixtures containing numerous ammonia borane derivatives, which often give overlapping signals that are hard to distinguish.