Journal of Fluorescence

, Volume 20, Issue 1, pp 299–303 | Cite as

Induced Intersystem Crossing at the Fluorescence Quenching of Laser Dye 7-Amino-1,3-Naphthalenedisulfonic Acid by Paramagnetic Metal Ions

  • Valery V. Volchkov
  • Vladimir L. Ivanov
  • Boris M. UzhinovEmail author
Original Paper


The fluorescence and triplet state quenching of 7-amino-1,3-naphthalenesulfonic acid by paramagnetic metal ions have been investigated in an aqueous medium. The basic mechanism of the fluorescence quenching involves the static and dynamic electron transfer to the paramagnetic cation. The induced S1→T1 intersystem crossing at fluorescence quenching of the fluorophore by Cu2+ cation has been found. There is a correlation between triplet state quenching rate constants and values of the efficient paramagnetic susceptibility and spin of the cations. The rate constants for the quenching pathways have been calculated.


Fluorescence quenching Paramagnetic metal ion Amino-G-acid Triplet-triplet absorption 


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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Valery V. Volchkov
    • 1
  • Vladimir L. Ivanov
    • 1
  • Boris M. Uzhinov
    • 1
    Email author
  1. 1.Moscow State UniversityMoscowRussia

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