Lack of Charge Transfer in Aromatic Charge—Transfer Complexes

Halogen pure electrical quadrupole resonance frequencies have been measured in the three 1:1 complexes, CBr4·p-xylene, CCl4·p-xylene, and Br2·benzene. From an examination of the measured frequencies of the complexes and the halogen-containing compounds (CBr, CCl4, and Br2) together with information from the x-ray structure determinations for two of the complexes, it has been concluded that little if any charge transfer exists in the ground state of these complexes.