Abstract
Alkali polysulfides dissolve in EPD-solvents (e.g. dimethylformamide, dimethylsulfoxide, and hexamethylphosphoramide) to give deep green, blue and carmine red solutions. Vis. and u.v. spectrophotometric as well as e.s.r. spectrometric investigations showed that normal polysulfides S x 2− with different chain length are the carriers of the yellow and red color, whereas the radical ion S 3 − is the blue species, which gives clear blue solutions or, if it is mixed with polysulfide anions with × 6, green or carmine red. U.v. and e.s.r. spectra point to the existence of two further radical ions S 2 − (yellow) and S 4 − (red) in EPD-solvents, The behaviour of polysulfides in these solvents can be understood by assuming that anions are only poorly solvated due to dipole shielding of the solvent molecules.
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