Abstract
The preparation of new charge-transfer complexes between strongly basic benzimidazolo carbocyanine donors and tetrahalogen-p-benzoquinone acceptors is described. These compounds consist of aggregates containing five donor molecules stabilized by one acceptor molecule. ESR measurements revealed the presence ofacceptor- and donor radicals, indicating a certain degree ofcharge separation. The electrochemical behaviour of these complexes was studied by polarography, revealing an anodic wave at +420 mV/SCE which is due to the formation of donor radicals by one-electron oxidation.Interesting properties of these charge-transfer complexes are their high light-fastness as compared to that of the free cyanine donor, and their very low pKa values for donor protonation. Due to the presence of a strong electron acceptor, these complexes desensitize silver halides towards actinic light, thus leading to reversal photographic images.
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