کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1235795 | 968854 | 2007 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Spectroscopic studies on the inclusion complex of 2-naphthol-6-sulfonate with β-cyclodextrin Spectroscopic studies on the inclusion complex of 2-naphthol-6-sulfonate with β-cyclodextrin](/preview/png/1235795.png)
The photophysical properties of 2-naphthol-6-sulfonate (2-NOH-6-S) in various solvents and in aqueous β-cyclodextrin solution have been investigated. The fluorescence quantum yields in non-aqueous solvents are approximately 0.20 ± 0.02, while in water the yield is higher. The fluorescence quantum yield in water was found to depend on the pH value of the medium and increases as the pH increase up to a pH value of 4.0 where it comes to be constant. Absorption and fluorescence measurements show 1:1 inclusion of 2-NOH-6-S in the β-cyclodextrin cavity. The association constant of 2-NOH-6-S–β-cyclodextrin complex based on fluorescence measurements was calculated using Benesi–Hildbrand relationship and found to be 330 ± 30 M−1. 1H NMR studies are used to confirm the inclusion and to provide information on the geometry of 2-NOH-6-S inside the cavity of β-cyclodextrin.
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 66, Issue 3, March 2007, Pages 732–738