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Journal of Fluorescence

, Volume 26, Issue 4, pp 1373–1380 | Cite as

Spectroscopic Studies on the Interaction of Metallic Ions with an Imidazolyl-Phenolic System

  • Ronaldo Barros OrfãoJr
  • Jessica Alves
  • Fernando Heering Bartoloni
ORIGINAL ARTICLE

Abstract

A fluorescent imidazolyl-phenolic compound was applied on the detection of metallic species (Cu2+, Al3+, Cr3+ and Fe3+) in a CH3CN/H2O (95/5, v/v) media. The presence and concentration of these cations altered significantly the emission profile of the probe, mainly lowering the signal intensity at 466 nm, while a new emission band around 395 nm appeared (for the trivalent ions). These results were rationalized as a combination of collisional quenching (KSV in the 103–104 L mol−1 range) and formation of a coordinated compound. The later disrupts the Excited State Intramolecular Proton Transfer that regulates the keto-enol tautomerism originally present on the free probe. Since the quenching efficiency and the obtained emission profiles are drastically different for Cu2+ and Fe3+ ions, this allows their differential recognition.

Keywords

Chemosensor ESIPT Fluorescent probe Copper(II) Iron(III) 

Notes

Acknowledgments

The authors thank the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP, RBOJr 2014/05813-2, JA 2013/17332-6, FHB 2012/13807-7) for financial support.

Supplementary material

10895_2016_1828_MOESM1_ESM.docx (1.3 mb)
ESM 1 (DOCX 1.32 mb)

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Ronaldo Barros OrfãoJr
    • 1
  • Jessica Alves
    • 1
  • Fernando Heering Bartoloni
    • 1
  1. 1.Centro de Ciências Naturais e HumanasUniversidade Federal do ABCSanto AndréBrazil

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