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Journal of Fluorescence

, Volume 22, Issue 2, pp 707–717 | Cite as

Influence of Substituent and Solvent on the Radiative Process of Singlet Excited States of Novel Cyclic Azacyanine Derivatives

  • Digambara Patra
  • Nagham N. Malaeb
  • Makhluf J. Haddadin
  • Mark J. Kurth
Original Paper

Abstract

The photophysical properties of novel cyclic azacyanine derivatives have been investigated in acetonitrile, N-butyronitrile, methanol, ethanol, DMF and water. Introduction of electron donating or accepting groups on the cyclic azacyanine has a direct impact on the spectroscopic and photophysical properties. Irrespective of the nature of the substitution, azacyanine shows a general solvent relaxation in accordance with Lippert-Mataga’s prediction; however, in protic solvent, specific interactions are encountered. Fluorescence lifetime decay suggests a relaxation in the nanosecond time scale with monoexponential decay in polar solvents and biexponential decay in non polar solvents. The fluorescence lifetime of azacyanines are found to be longer than popular cy3 dyes. An electron donating substituent increases the fluorescence lifetime and influences the radiative process, whereas an electron withdrawing group marginally increases the excited state lifetime but remarkably enhances the radiative process. The fluorescence quantum yield of substituted cyclic azacyanine in water is noted to be at least five fold higher than the popular cy3 dye.

Keywords

Cyclic Azocyanine Solvent effect Substituent effect Excited state process Fluorescence lifetime, Radiative process 

Notes

Acknowledgement

The authors thank Lebanese National Council for Scientific Research (LNCSR) (D.P.) and American University of Beirut through its University Research Board (URB) for financial support, Long- term Faculty Development grant (D.P.) and Junior Faculty Research Leave (D.P.).

Supplementary material

10895_2011_1006_MOESM1_ESM.doc (174 kb)
Supplement 1 Plot of absorption maxima (A) and emission maxima (B) of CAC, F-CAC and MeO-CAC versus π* scale of the solvents. (DOC 173 kb)

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Digambara Patra
    • 1
  • Nagham N. Malaeb
    • 1
  • Makhluf J. Haddadin
    • 1
  • Mark J. Kurth
    • 2
  1. 1.Department of ChemistryAmerican University of BeirutBeirutLebanon
  2. 2.Department of ChemistryUniversity of CaliforniaDavisUSA

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