Electronic Spectra and Charge-Transfer Absorption of Solid Anion Radical Salts of 2,3-Dicyano-<i>p</i>-benzoquinone and 2,3-Dichloro-5,6-dicyano-<i>p</i>-benzoquinone

Abstract

Abstract The diffuse reflection spectra were measured with solid anion radical salts of 2,3-dicyano-p-benzoquinone and 2,3-dichloro-5,6-dicyano-p-benzoquinone with rubidium and caesium cations. Strong charge-transfer transition between anion radicals was observed in the lowenergy region. The spectroscopic features of the chargetransfer absorption were discussed in terms of one-dimensional Hubbard model.