کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1408457 | 1501741 | 2014 | 8 صفحه PDF | دانلود رایگان |
• Flavanone and 7-aminoflavone form 1:1 stoichiometric inclusion complexes with C-HPA.
• Structure of the inclusion complexes proposed by 2D ROESY NMR.
In this paper, we report the structures of the host–guest complexes of flavanone and 7-aminoflavone (guests) with C-Hexylpyrogallol[4]arene (host). The study of the host–guest binding is carried out using UV–Visible absorption, steady-state and time-resolved fluorescence, and 2D ROESY spectroscopy. The stoichiometry and the binding constant of the C-Hexylpyrogallol[4]arene–guest complexes are reported based on absorption and fluorescence titrations. Both flavanone and 7-aminoflavone form 1:1 complexes with the host with binding constant values of 1.71 × 104 mol−1 dm3 and 2.06 × 104 mol−1 dm3 respectively. Fluorescence quenching of the two flavonoids on complex formation occurs and the Stern–Volmer constants are reported. The mode of binding of flavanone and 7-aminoflavone with the host molecule is optimized with 2D ROESY and the structures of the inclusion complexes are proposed.
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Journal: Journal of Molecular Structure - Volume 1076, 5 November 2014, Pages 318–325