Abstract
The present work deals with the pure nuclear quadrupole resonance of 35Cl and 11B in the mixed boron halides BCl 2Br and BClBr 2. These compounds only exist in equilibrium with each other and the binary boron halides BCl 3 and BBr 3. The 35Cl lines of the various components in such solid solutions could be resolved by a two-dimensional SEDOR experiment. The observed continuous decrease of the 11B and 35Cl resonance frequencies in the sequence BCl 3 > BCl 2Br > BClBr 2 finds its explanation in intramolecular variations of the electron density caused by the different electronegativity of chlorine and bromine.
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