2'-Hydroxychalcone (HC) analogues 1 and 2 having a diene part tethering the phenyl and naphthyl chromophores, respectively, were prepared, and their photochemical and photophysical properties were studied. Fluorescence from these compounds was absent in solution and the solid state. Based on the results obtained upon steady state and laser flash photolyses, compound 2 was found to be substantially stable on photoirradiation without undergoing intersystem crossing to the triplet state whereas compounds 1 showed transient absorption due to the triplet tautomer. The deactivation processes in the excited states were discussed by considering energetic reaction diagrams for the corresponding tautomers and isomers.

制备了分别具有束缚苯基和萘基发色团的二烯部分的2'-羟基查耳酮（HC）类似物1和2，并研究了它们的光化学和光物理性质。这些化合物的荧光在溶液和固态下均不存在。基于在稳态和激光闪光光解时获得的结果，发现化合物2在光辐照下基本稳定，而没有发生系统间交叉至三重态，而化合物1由于三重互变异构体而显示出瞬时吸收。通过考虑相应的互变异构体和异构体的高能反应图，讨论了在激发态下的失活过程。