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A PCT-based, pyrene-armed calixcrown fluoroionophore
- A PCT-based, pyrene-armed calixcrown fluoroionophore
- Choi J.K.; Kim S.H.; Yoon J.; Lee K.-H.; Bartsch R.A.; Kim J.S.
- Ewha Authors
- SCOPUS Author ID
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- Journal Title
- Journal of Organic Chemistry
- vol. 71, no. 21, pp. 8011 - 8015
- SCI; SCIE; SCOPUS
- A photoinduced charge transfer (PCT)-based 1,3-alternate calixcrown fluoroionophore containing two cation recognition sites, a crown ether ring and two facing pyreneamide groups, is synthesized. Upon addition of K +, Pb 2+, or Cu 2+, wavelength changes are observed in both the fluorescence and absorption spectra, but with different binding modes. With K +, fluorescence emissions of the ligand scarcely change, while addition of Pb 2+ or Cu 2+ produces a remarkable change in both the excimer and monomer emissions. The observed data indicate that the metal cation is encapsulated in the crown-5 ring for K + and by the two facing amide groups in the latter case, which is verified by a metal ion exchange experiment. The wavelength shifts in both fluorescence and absorption spectra upon addition of Cu2+ show that, in contrast to Pb 2+, Cu 2+ interacts with the nitrogen atoms of the amide groups, resulting in a PCT mechanism. © 2006 American Chemical Society.
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