The Electronic Structure of Borazine as seen by 10 B , n B , and 14 N Nuclear Quadrupole Double Resonance

The nitrogen nuclear quadrupole coupling in borazine is reported and interpreted in combina­ tion with the previously measured boron coupling. A novel Townes-Dailey type of analysis was employed to obtain the electron distribution in borazine. A calculated rc-donation of ~ 0.5 e from the nitrogen atom to the vacant rc-orbital of boron is accompanied by a strong polarisation of the er-skeleton, imparting a negative charge to nitrogen and a positive charge to boron.