Abstract
We have carried out an investigation on benzo[b]naphtho[2,3-e][1,4]dioxin-6,11-dione (1) and benzo[b]naphtho[2,3-e][1,4]dithi-in-6,11-dione (2) by absorption and linear dichroism spectroscopy and cyclic voltammetry. The corresponding anion and cation radicals have been produced and studied by ESR. From these studies it has been concluded that the main contribution to the low-energy absorption for both compounds is an intramolecular charge-transfer transition which is polarized along the short molecular axis.
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