The vibrational spectra of bis(dimethylamino)boranes, [(CH3)2N]2BX with X  H, D, CH3 or CD3 have been examined and assignments to the fundamental vibrations are supported by the results of a normal coordinate analysis. In addition, some nuclear magnetic resonance data on bis(dimethylamino)boranes are discussed.

The vibrational spectra of bis(dimethylamino)haloboranes, [(CH3)2N]2BX, with X = Cl, Br, I, have been recorded. The proposed assignments to the fundamentals are substantiated by the results of a normal coordinate treatment. Extensive coupling of fundamentals precludes a diagnostic use of the boron‐halogen stretching frequency without consideration of the environment of the boron atom.

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Nuclear magnetic resonance and vibrational spectroscopic data support the existence of liner CNB skeleton in monomeric iminoboranes of the type R2CNBR 2′. This allene‐like arrangement of the central moiety of the compounds does not seem to enhance the NB bond strength by interaction of this bond with the vicinal CN bond. Rather, in the case of R′ being a hydrocarbon group, the nature of the NB bond is similar to that found in (monoamino) diorganyl‐boranes, R2NBr 2′. Similarly, (CF3)2CNB[N(CH3)2]2 may ve viewed as a trisaminoborane. However, the rigid CNBN2 unit makes this compound colored and the electronic structure of the species was studied; theoretical and experimental data are in good agreement.

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