Abstract
Detailed investigations on 3,4,9,10-perylenetetracarboxylic 3,4:9,10-diimides by in-situ EPR spectroscopy, difference pulse polarography, and charge-discharge studies during electrochemical reduction using lithium as counter electrode material are reported. In contrast to conjugated polymers which only show single line EPR spectra the low molecular substances provide high resolved EPR spectra of each separate reduction step. In that way information about spin density distributions and charge states of the molecule are obtained. In connection with other electrochemical methods it was shown that per molecule two electrons can be charged and discharged with excellent reversibility.
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