From analyses of the UV/Vis absorption, emission and excitation of emission spectra of all-trans-α,ω-diphenylpolyenes with five to seven polyene double bonds (1,10-diphenyldecapentaene, DPP5, 1,12-diphenyldodecapentaene, DPP6, and 1,14-diphenyltetradecaheptaene, DPP7), it is concluded that these compounds do not exhibit a dual S1/S2 fluorescence, as hitherto proposed by ]). The spectral data of DPP5, DPP6, and DPP7 show a unique fluorescence the intensity of which decreases with the increase of the polyene chain length.
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