Photoelectron spectra of the symmetric trimethylborazines

Abstract
The He(I) photoelectron spectra and the measured vertical ionization potentials of B-trimethyl-borazine and N-trimethylborazine, are reported and compared with those of borazine, and with the results of CNDO/2 calculations, to show that the highest-lying occupied orbital in all three compounds is of π type, and not σ as is indicated for borazine by calculations.

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