Fluorescence quenching studies on the interaction of a novel deepened cavitand towards some transition metal ions

Li, Yin and Csók, Zsolt and Szuroczki, Péter and Kollár, László and Kiss, László and Kunsági-Máté, Sándor (2013) Fluorescence quenching studies on the interaction of a novel deepened cavitand towards some transition metal ions. Analytica Chimica Acta, 799. pp. 51-56. ISSN 0003-2670

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Abstract

A novel 'three-level' deepened cavitand featuring a significantly sizable portal has been synthesized and its interaction with some transition metal ions has been investigated in THF/H2O binary solvent using fluorescence quenching technique. The results suggest that among the used transition metal ions including Ag+, Cd2+, Cu2+, Fe3+, Cr3+, Hg2+, La3+, Mn2+, Ni2+, Zn2+ and Co2+, only Fe3+ and Cu2+ show good quenching ability. In order to interpret the quenching mechanism, the Stern-Volmer kinetics, and the presence of both the dynamic and static quenching have been discussed. It was found that the simultaneous presence of the sphere-of-action static quenching and dynamic quenching model agrees very well with the experimental results. The limits of detection for Fe3+ and Cu2+ were found to be 2.1 x 10(-6) mol L-1 (3 sigma) and 3.6 x 10(-6) mol L-1 (3 sigma), respectively. Cations with potential interference, such as K+, Na+, Mg2+, Ca2+, Co2+, La3+ and Mn2+ do not have significant effects on the determinations of Fe3+ and Cu2+. This cavitand can be potentially applied as optical sensor for the detection of Fe3+ and Cu2+.

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