The Ultraviolet Spectra of Benzene-Halogen Complexes and of Iodine in Solution

The spectra of the 1:1 complexes between benzene and iodine and between benzene and bromine were examined in the wavelength range 2350–3500A using a 64-micron cell. In both cases a new absorption band was found at 2600A. This band is of considerable theoretical interest in connection with previous discussions of the spectra and structures of the benzene-halogen complexes. Also, the solution spectrum of iodine has been extended to 1820A and the f value compared with predictions.