Abstract
THE ultraviolet absorption spectra of simple inorganic anions contain intense (f about 0.1) broad structureless bands which have been characterized as charge-transfer-to-solvent transitions1, or special cases of electron transfer spectra2. Detailed models1,3,4 for these transitions treat the excited state as a radical and electron, with the latter in a centro-symmetric orbital on the solvent molecules surrounding the parent anion site. Such a transition would be represented by 
The development of this theory has so far been restricted to the halide ions, and there is considerable disagreement about the detailed nature of the excited state5. The description of other anions in solution involves uncertainties which are so far unresolved6.
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FOX, M., HUNTER, T. Charge-transfer-to-solvent Spectra. Nature 223, 177–178 (1969). https://doi.org/10.1038/223177b0
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DOI: https://doi.org/10.1038/223177b0
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