Electronic absorption spectra for free hydrazyl radicals, their ionic forms and initial hydrazines

The results of the calculations of π–π^* transition energies of some free hydrazyl radicals, their ionic forms and initial hydrazines by the SCF–MO–LCAO method with restricted configuration interaction are presented. The comparison of the data obtained with the electronic spectra experimentally found, revealed that the absorption of radical solutions in the visible area was due to the electronic structure of radical molecules, the contribution of ionic forms to the absorption being negligible.