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The structure and the energy spectra of new classes of coupled polymethines (CP) (coupled cyanines, merocyanines and oxonoles) were investigated theoretically. The CPs may be considered as being composed of two identical or two different streptopolymethine fragments or as derivatives of poly(peri-naphthylene)s. All CPs display low-energy 1 S o -> 1 S 1 transitions...
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