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Issue 8, 2017
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Two uranyl heterocyclic carboxyl compounds with fluorescent properties as high sensitivity and selectivity optical detectors for nitroaromatics

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Abstract

The two compounds UO2(C16H7N4O4)2·2H2O (1) and UO2(C20H12N5O2)2 (2) have been synthesized, based on the different heterocyclic carboxyl ligands 2,3-pyrazino[1,10]phenanthroline-2,3-dicarboxylic acid (H2L1) and 2,6-bis(2-pyrazinyl)pyridine-4-benzoic acid (HL2). The two compounds were characterized by elemental analysis, IR spectroscopy, PXRD, thermogravimetric analysis and UV-visible spectroscopy. Single crystal X-ray diffraction analysis revealed that both compounds 1 and 2 exhibited 2D sheet structures. Moreover, the study of fluorescence quenching properties of compounds 1 and 2 showed that luminescence intensity decreases for both 1 and 2 were especially obvious with increasing of nitroaromatics concentration, even if the nitroaromatics were at a very low concentration (for 1 it is 15 ppm, for 2 it is 20 ppm), which can also be detected. The experimental results suggest a high selective quenching of initial fluorescence intensity in the presence of nitroaromatic compounds. And by calculating the quenching constants of the nitroaromatics using the SV equation (I0/I) = KSV[A] + 1, we can see the KSV values of the quencher 2,4,6-trinitrophenol are both largest for the two compounds, and the values are 1.6 × 106 and 8.5 × 105 for 1 and 2, respectively. This means that the two compounds have the most sensitive luminescence. In addition, compound 2 exhibits enhanced fluorescence behavior towards aldehyde compounds, showing a turn-on fluorescence responsive behavior.

Graphical abstract: Two uranyl heterocyclic carboxyl compounds with fluorescent properties as high sensitivity and selectivity optical detectors for nitroaromatics

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Publication details

The article was received on 15 Dec 2016, accepted on 06 Mar 2017 and first published on 07 Mar 2017


Article type: Paper
DOI: 10.1039/C6NJ03933B
Citation: New J. Chem., 2017,41, 3073-3081
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    Two uranyl heterocyclic carboxyl compounds with fluorescent properties as high sensitivity and selectivity optical detectors for nitroaromatics

    S. Li, L. X. Sun, J. C. Ni, Z. Shi, Y. H. Xing, D. Shang and F. Y. Bai, New J. Chem., 2017, 41, 3073
    DOI: 10.1039/C6NJ03933B

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