synthesized compounds were studied. Their absorption spectra are unusual; along with the long-wavelength band in the visible spectral region, they contain a much more intense short-wavelength band in the near UV region. This pattern of the absorption spectra is explained in terms of the model of chromophore interaction, assuming an acute angle between the chromophore “halves” of the polyene chain of the
β-
二甲氨基丙烯醛缩醛胺与
2,6-二甲基-γ-吡喃酮反应生成 2,6-双(4-
二甲氨基烷烃-1,3-二烯基)-4H-
吡喃-4-酮,其烷基化生成乙氧基十
三甲胺盐。研究了合成化合物的光谱和荧光特性。它们的吸收光谱不寻常;除了可见光谱区的长波长带外,它们还包含近紫外区更强烈的短波长带。假设
染料分子的多烯链的生色团“半部”之间存在锐角,则根据发色团相互作用模型来解释吸收光谱的这种模式。乙氧基十三次甲基盐中的中心
吡喃环会阻碍聚次甲基链中的结合。2,6-双(4-
二甲氨基烷-1)的热致变色,观察到 3-二烯基)-4H-
吡喃-4-酮(溶液冷却时吸收光谱的长波位移);只有长波长吸收带经历了明显的热致变色位移。将甲基或苯基取代基引入取代的
4H-吡喃酮的多烯链会降低荧光量子产率。