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Lead and Mercury Sensing by Calixarene-Based Fluoroionophores Bearing Two or Four Dansyl Fluorophores

机译:带有两个或四个丹酰基荧光团的杯芳烃基氟离子团对铅和汞的传感

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A detailed study on the pho-tophysical and complexing properties of calixarenes bearing two and four dansyl derivatives (Calix-DANS2 and Calix-DANS4) in a CH_3CN/H_2O mixture (60:40 v/v) is reported.Calix-DANS2 shows a high selectivity towards Hg~(2+) over interfering cations (Na~+,K~+,Ca~(2+),Cu~(2+),Zn~(2+),Cd~(2+) and Pb~(2+)) and a sensitivity in the 10~(-7)molL~(-1) concentration range.The complexation of mercury ion induces a strong fluorescence quenching due to a well-defined electron transfer process from the fluorophore to the metal center.Calix-DANS4 exhibits an extremely high affinity for Pb~(2+) with a high selectivity over various competing ions.The unprecedented detection limit (4 mugL~(-1)) is fully compatible with the level defined by the World Health Organisation.The affinity of Calix-DANS4 for Pb~(2+) can be rationalized by the activation of the inert pair of electrons on Pb~(2+).The number of fluo-rophores involved in the complexation can be determined from a careful time-resolved fluorescence characterization.
机译:报道了在CH_3CN / H_2O混合物(60:40 v / v)中带有两个和四个丹磺酰基衍生物(Calix-DANS2和Calix-DANS4)的杯芳烃的光物理和络合特性的详细研究.Calix-DANS2显示对Hg〜(2+)的干扰阳离子(Na〜+,K〜+,Ca〜(2 +),Cu〜(2 +),Zn〜(2 +),Cd〜(2+)和Pb的选择性高〜(2+))和10〜(-7)molL〜(-1)浓度范围内的灵敏度。由于从荧光团到荧光团的明确电子转移过程,汞离子的络合诱导了强烈的荧光猝灭。 Calix-DANS4对Pb〜(2+)表现出极高的亲和力,对各种竞争性离子具有很高的选择性,前所未有的检测限(4 mugL〜(-1))与World定义的水平完全兼容卫生组织.Calix-DANS4对Pb〜(2+)的亲和力可以通过激活Pb〜(2+)上的惰性电子对来实现合理化。小心时间分辨荧光表征。

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