FLUORESCENCE-SPECTRA CHARACTERISTICS OF ALPHA,OMEGA-DI-1-ANTHRYLPOLY-YNES AND 9-ANTHRYLPOLY-YNES

It has been found that the longest-wavelength of the absorption maxima (λL) in the electronic spectra of both the α,ω-diarylpoly-yne and polyene series varies linearly with the xth power of the number (n) of multiple bonds [λL∝ nx, the value of x changes with both the structure of the terminal groups and the position of substitution of the unsaturated chain, e.g. x = 2 for α,ω-Di-1-and 9-anthrylpoly-ynes(1n,and 2m n = 1-6)]. The results are different from the formerly accepted regularity (λL2∝ n). The paper describes the fluorescence spectra characteristics of a series of 1n and 2n. The results of this investigation shows that, as in the case of the absorption spectra, both the excitation maxima ( λex ) and the emission maxima (λem)in the fluorescence spectra of 1n and 2n have a linear relationship with n2 (λex ∝ n2 and λem ∝ n2, respectively). © 1990.