Abstract
Abstract The nuclear quadrupole double-resonance spectra of the two isotopic forms of borazine, B314N3H6 and B315N3H6, have been obtained at 77 K in the frequency range 50–2000 kHz, and a definite assignment of the 14N frequencies made. A Townes-Dailey analysis of the 10B, 11B and 14N quadrupole coupling tensors suggests that π-donation from N to B is compensated for by a stronger σ-donation from B to N, so that N carries a net negative charge and B a positive one.
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