Spectroscopic studies on the inclusion complex of 2-naphthol-6-sulfonate with β-cyclodextrin
Ayman Abdel-Shafi;
Abstract
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. © 2006 Elsevier B.V. All rights reserved.
Other data
| Title | Spectroscopic studies on the inclusion complex of 2-naphthol-6-sulfonate with β-cyclodextrin | Authors | Ayman Abdel-Shafi | Issue Date | 1-Mar-2007 | Journal | Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | DOI | 3 https://api.elsevier.com/content/abstract/scopus_id/33846676427 732 66 10.1016/j.saa.2006.04.018 |
PubMed ID | 66 | Scopus ID | 2-s2.0-33846676427 |
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