Fluorescence Quenching of the Europium Tetracycline Hydrogen Peroxide Complex by Copper (II) and Other Metal Ions

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Abstract:

The europium–tetracycline complex [Eu(Tc)] is known to show only weak fluorescence with an emission maximum at 615 nm. On addition of hydrogen peroxide (HP), the strongly fluorescent [Eu(Tc)(HP)] complex is formed, which displays a 15-fold stronger luminescence intensity. This study describes the decrease in luminescence intensity of the [Eu(Tc)(HP)] complex in aqueous solution in the presence of Cu2+, Fe3+, Ag+, Al3+, Zn2+, Co2+, Ni2+, Mn2+, Ca2+, and Mg2+. Static and dynamic quenching can be induced by Cu2+, and these processes were quantified by means of their quenching constants. Stern–Volmer plots were also derived from lifetime imaging measurements accomplished by the rapid lifetime determination (RLD) technique based on microwell plate assays, and also by the time-correlated single photon counting (TCSPC) technique. According to those data, a time-resolved fluorescent method for copper determination can be proposed that is based on dynamic quenching of the [Eu(Tc)(HP)] complex by Cu2+ ions. The response to copper concentrations is linear up to 1.6 μmol L−1, providing a detection limit of 0.2 μmol L−1.

Keywords: COPPER DETERMINATION; EUROPIUM TETRACYCLINE HYDROGEN PEROXIDE TERNARY COMPLEX; HEAVY METAL QUENCHING; SINGLE PHOTON COUNTING TECHNIQUE; TIME-RESOLVED FLUORESCENCE IMAGING

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370205774430945

Affiliations: 1: Department of Analytical Chemistry, University of Granada, Granada 18071, Spain 2: Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, 93040 Regensburg, Germany

Publication date: October 1, 2005

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