Bichromophoric compounds containing a nucleotide base and coumarin linked with a polymethylene chain have been synthesized. A hypochromic effect was observed for adenine–coumarin pairs in contrast to the thymine containing compound. The fluorescence intensity of coumarin when bound into these systems was found to be significantly reduced. It has also been demonstrated that excitation energy is transferred from adenine or thymine to the coumarin moiety. Intermolecular dimerization of coumarin residues was observed upon irradiation of an adenine–coumarin pair.
已合成含有核苷酸碱基和香豆素的双色性化合物,它们通过聚亚甲基链连接。与含有胸腺嘧啶的化合物相比,腺嘌呤-香豆素对显示出次色效应。当香豆素结合到这些系统中时,其荧光强度明显降低。还表明,激发能从腺嘌呤或胸腺嘧啶转移至香豆素基团。在腺嘌呤-香豆素对辐射后观察到香豆素残基的分子间二聚化。