Journal of Fluorescence

, Volume 12, Issue 2, pp 263–268 | Cite as

Potassium Sensing by Using a Newly Synthesized Squaraine Dye in Sol-Gel Matrix

  • Kadriye Ertekin
  • Berrin Yenigül
  • Engin U. Akkaya
Article

Abstract

Squaraines are a group of fluorescent dyes and pigments derived from squaric acid and dialkylanilines well known in applications such as photoreceptors, organic solar cells, optical recording media, and non-linear optics. Their very promising spectral properties, long wavelength absorption and emission, and high absorptivity and quantum yields have not been exploited so far in relation to optical sensor design. They exhibit excellent solubility in sol-gel matrices, and the ligand is an integral part of the fluorophore π system, which makes the molecule a fluoroionophore. In this work, potassium-sensing agent, bis[4-N-(1-aza-4,7,10,13,16-pentaox acyclooctadecyl)-3,5-dihydroxyphenyl] squaraine has been used for potassium sensing in a sol-gel matrix. The spectrofluorimetric response of dye-doped tetraethyl ortosilicate (TEOS) film after exposure to certain concentrations of K+ has been investigated, and 62% of relative signal change was achieved. The dynamic working range of the sensor membrane has been found between 10−9 and 10−6 M K+, in other terms from nanomolar to micromolar levels, which is an advantage over flame emission spectroscopy, in view of detection limit. The sensor is fully reversible within the dynamic range and the response time (τ90) is found to be 2 min under batch conditions. The cross-sensitivity of the molecule to Na+, Ba2+, Ca2+, and NH+4 was also tested in separate solutions.

Optical potassium sensing squarine structure sol-gel matrix 

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REFERENCES

  1. 1.
    H. W. Chan, A. W. M. Lee, C. M. Lee, K. W. Yau, and K. Wang (1995) Analyst 120, 1963.Google Scholar
  2. 2.
    O. S. Wolfbeis and B. P. H. Schaffer Anal. Chim. Acta, (1987) 198, 1–12.Google Scholar
  3. 3.
    E. Wang, L. Zhu, L. Ma, H. Patel, (1997) Anal. Chim. Acta 357, 85–90.Google Scholar
  4. 4.
    K. Toth, G. Nagy, B. T. T. Lan, J. Jeney, and S. J. Choquette, (1997) Anal Chim. Acta 353, 1–10.Google Scholar
  5. 5.
    M. T. Ambrose and M. E. Meyerhoff, (1999) Anal. Chim. Acta 378, 119–126.Google Scholar
  6. 6.
    M. Shortreed, E. Bakker, and R. Kopelman, (1996) Anal. Chem. 68, 2656–2662.Google Scholar
  7. 7.
    E. U. Akkaya, Squaraine-Based Long Wavelength Fluorescent Chemosensors for Ions in Chemosensors in Chemosensors of Ion and Recognition, Proc. NATO ASI Series C, Vol. 492, Kluwer Academic Press, Dordrecht, pp. 177–188.Google Scholar
  8. 8.
    U. Oguz and E. U. Akkaya, (1998) Tetrahedron Lett., 39, 5857–5860.Google Scholar
  9. 9.
    J. M. McKiernan, S. A. Yamanoka, B. Dunn, and J. I. Zink (1990) J. Phys. Chem. 94, 5654.Google Scholar
  10. 10.
    M. Nakamura, H. Nasu, and K. Kamiya (1991) J. Non-Criyst. Solids 135, 1.Google Scholar
  11. 11.
    A. J. Fielding, C. C. Davis, C. J. Brinker, and G. W. Scherer (1986) The Physics and Chemistry of Sol-Gel Processing, Academic Press, New York.Google Scholar
  12. 12.
    M. A. Kessler and O. S. Wolfbeis (1991) Spectrochim. A. 47, 187.Google Scholar
  13. 13.
    E. Wang, M. E. Meyerhoff, and V. C. Yang (1995) Anal. Chem. 67, 522Google Scholar

Copyright information

© Plenum Publishing Corporation 2002

Authors and Affiliations

  • Kadriye Ertekin
    • 1
  • Berrin Yenigül
    • 1
  • Engin U. Akkaya
    • 2
  1. 1.Department of Chemistry, Faculty of ScienceEge University, BornovaIzmirTurkey
  2. 2.Department of ChemistryMiddle East Technical UniversityAnkaraTurkey

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