We report in this paper the different modes of interaction of coumarin 7 and coumarin 314 with the cavity-containing molecule C-hexylpyrogallol[4]arene. The stoichiometry and the binding constant of coumarin 7 for its binding with C-hexylpyrogallol[4]arene are reported. The analysis is done with UV–Vis absorption, steady-state and time-resolved fluorescence, and 2D ROESY spectroscopy. The fluorescence quenching of the two coumarins is analyzed and the Stern–Volmer constants are reported. The mode of binding of coumarin 7 with the host molecule is optimized with 2D ROESY. Coumarin 314 does not form an inclusion complex and this result is supported by the spectral data. The ground and the excited state pK a values for the coumarins, in the presence of C-hexylpyrogallol[4]arene, are reported.
我们在本文中报道了
香豆素 7 和
香豆素 314 与含空腔分子 C-己基连苯三
酚[4]
芳烃相互作用的不同模式。报告了
香豆素 7 与 C-己基连苯三
酚[4]
芳烃结合的
化学计量和结合常数。通过紫外-可见吸收、稳态和时间分辨荧光以及 2D ROESY 光谱进行分析。分析了两种
香豆素的荧光猝灭并报告了 Stern-Volmer 常数。使用 2D ROESY 优化了
香豆素 7 与主体分子的结合模式。
香豆素 314 不形成包合物,并且该结果得到光谱数据的支持。报告了在 C-己基连苯三
酚[4]
芳烃存在下
香豆素的基态和激发态 pKa 值。