SEVERAL charge transfer complexes have been examined in this laboratory. This investigation has been concerned with the electrical and magnetic properties of these compounds as well as their syntheses. The p-chloranil–p-phenylenediamine complex has thus far been examined in greatest detail1. So far as the p-bromanil–p-phenylenediamine complex is concerned, measurements of its paramagnetism2 and electrical resistivity3–5 have been reported by various workers ; however, the literature contains little or no details concerning the preparation and especially the composition of this p-bromanil–p-phenylenediamine complex2,3,5,6. A 1:3 ratio of quinone to amine based on the carbon, hydrogen and nitrogen analyses has been postulated5. It is now shown that this particular complex has a 1:1 quinone to amine ratio with benzene included in the crystal lattice whereas the complex prepared by a special dry reaction has a 1:1 ratio without any solvent.