Supramolecular complexation of locked-flavylium fluorescent dye by cucurbit[7]uril: photophysics and p<i>K</i><sub>a</sub> modulation
Herein, we studied the supramolecular host-guest complexation between cucurbit[7]uril (CB7) and a locked version of flavylium dye (LF) in aqueous solution. CB7 was able to form complexes with LF in its various protonation states as verified by UV-visible and fluorescence spectroscopy, revealing high binding affinities for the cationic and neutral form compared to the anionic one and resulting in complexation induced p<i>K</i><sub>a</sub> shifts. The formation of inclusion complexation was established by <sup>1</sup>H NMR and supported by DFT calculations.
Authors
- Khaleel I. Assaf (ORCID: https://orcid.org/0000-0003-4331-8492)
- Mahmoud K. Al‐Joumhawy (ORCID: https://orcid.org/0000-0001-9116-3398)
- Mohammad A. Alnajjar (ORCID: https://orcid.org/0000-0002-2261-6127)
Institutions
- Osnabrück University (DE)
- Al-Balqa Applied University (JO)
- Yarmouk University (JO)
Publication Details
- Journal
- Physical Chemistry Chemical Physics
- Published
- 2025-01-01
- DOI
- https://doi.org/10.1039/d5cp02318a
- Primary Topic
- Supramolecular Chemistry and Complexes
- Type
- article
- Field-Weighted Citation Impact
- 0.00