Abstract

The nuclear quadrupole resonance frequencies of 2,4-dibromoanisole at 77 K and 296 K have been determined, as well as those of 2,4,6-tribromoanisole at 296 K. The Zeeman effect has been studied in both substances at 296 K using the so-called ‘geometric method’; this allowed us to find in both cases the value of the asymmetry parameter η of the electric field gradient tensors on the Br nuclei. An assignment of the resonance frequencies to the various bromine atoms is given on the basis of our results, which also give, using the Townes and Dailey theory, values for the electron populations of the σ and π orbitals.

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