Department of General and Physical Chemistry, University of Pécs, Ifjúság 6., H-7624 Pécs, Hungary; János Szentágothai Research Center, H-7624 Pécs, Ifjúság 20., Hungary.
Anal Chim Acta. 2013 Oct 17;799:51-6. doi: 10.1016/j.aca.2013.09.013. Epub 2013 Sep 12.
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(+), Cd(2+), Cu(2+), Fe(3+), Cr(3+), Hg(2+), La(3+), Mn(2+), Ni(2+), Zn(2+) and Co(2+), only Fe(3+) and Cu(2+) 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 Fe(3+) and Cu(2+) were found to be 2.1×10(-6) mol L(-1) (3σ) and 3.6×10(-6) mol L(-1) (3σ), respectively. Cations with potential interference, such as K(+), Na(+), Mg(2+), Ca(2+), Co(2+), La(3+) and Mn(2+) do not have significant effects on the determinations of Fe(3+) and Cu(2+). This cavitand can be potentially applied as optical sensor for the detection of Fe(3+) and Cu(2+).
一种新型的具有显著大孔径的“三级”深穴超分子主体已经被合成，并在 THF/H2O 二元溶剂中使用荧光猝灭技术研究了其与一些过渡金属离子的相互作用。结果表明，在所使用的过渡金属离子（包括 Ag(+)、Cd(2+)、Cu(2+)、Fe(3+)、Cr(3+)、Hg(2+)、La(3+)、Mn(2+)、Ni(2+)、Zn(2+)和 Co(2+)）中，只有 Fe(3+)和 Cu(2+)表现出良好的猝灭能力。为了解释猝灭机制，讨论了 Stern-Volmer 动力学和动态猝灭和静态猝灭的存在。结果发现，同时存在作用球静态猝灭和动态猝灭模型与实验结果非常吻合。Fe(3+)和 Cu(2+)的检测限分别为 2.1×10(-6)mol·L(-1)（3σ）和 3.6×10(-6)mol·L(-1)（3σ）。具有潜在干扰的阳离子，如 K(+)、Na(+)、Mg(2+)、Ca(2+)、Co(2+)、La(3+)和 Mn(2+)，对 Fe(3+)和 Cu(2+)的测定没有显著影响。这种主体分子有望作为检测 Fe(3+)和 Cu(2+)的光学传感器。
