Abstract
A method for the synthesis of anionic polymethine dyes which contain a vinylene bridge in the chromophore is described. It involves the dehydration of malonocyanines containing an ethylene bridge in the polymethine chain. The UV-VIS-, 1H and 13C-NMR spectra of the dyes are reported and quantum-chemical calculations of the electronic structure of the compounds were carried out using the PPP approximation. The theoretical prediction of the hypsochromic effects in the spectra of the dyes is in good agreement with the results of studies of their oxidation potentials (E ox 1 2 ).
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