The assignment of 11 B and 1 H resonances in the post-reaction mixture from the dry synthesis of Li(BH3 NH2 BH2 NH2 BH3 ).

Ewa K Nawrocka, Agnieszka Prus, Rafał Owarzany, Wiktor Koźmiński, Krzysztof Kazimierczuk, Karol J Fijalkowski

Magnetic resonance in chemistry : MRC 2023 Jan

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We report a detailed 1 H NMR and 11 B NMR study of as synthesised Li ( BH 3 NH 2 BH 2 NH 2 BH 3 ) 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: NH 3 BH 3 , Li ( NH 2 BH 3 ) , Li ( BH 4 ) , and two yet unknown salts containing 7-membered chain anions: ( BH 3 NH 2 BH 2 NH 2 BH 2 NH 2 BH 3 ) - and ( BH ( NH 2 BH 3 ) 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. © 2022 John Wiley & Sons Ltd.

Citation

Ewa K Nawrocka, Agnieszka Prus, Rafał Owarzany, Wiktor Koźmiński, Krzysztof Kazimierczuk, Karol J Fijalkowski. The assignment of 11 B and 1 H resonances in the post-reaction mixture from the dry synthesis of Li(BH3 NH2 BH2 NH2 BH3 ). Magnetic resonance in chemistry : MRC. 2023 Jan;61(1):49-54