The synthesis, structural elucidation and fluorescent sensitization detection to Hg2+ based on two lanthanide-organic complexes

[Display omitted] •Two lanthanide coordination compounds (Tb-complex, Dy-complex) have been obtained.•Their structures have been analyzed and characterized systematically.•These compounds exhibit strong characteristic Ln3+ ions photo-luminescence emissions in visible regions.•Tb-Complex exhibits goo...

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Veröffentlicht in:Inorganica Chimica Acta Jg. 502; S. 119370
Hauptverfasser: Li, Rong-fang, Zhang, Ya-wen, Liu, Xin-fang, Chang, Xin-hong, Feng, Xun
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Amsterdam Elsevier B.V 01.03.2020
Elsevier Science Ltd
Schlagworte:
Aqueous solutions
Crystals
Dicarboxylic acids
Dysprosium (III) complex
Energy transfer
Fluorescence
Hg2+ detection
Infrared analysis
Luminescence
Mercury (metal)
Single crystals
Terbium (III) complex
Thermogravimetric analysis
Water stability
Dysprosium (III) complex
Terbium (III) complex
Luminescence
Hg2+ detection
ISSN:0020-1693, 1873-3255
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Zusammenfassung:[Display omitted] •Two lanthanide coordination compounds (Tb-complex, Dy-complex) have been obtained.•Their structures have been analyzed and characterized systematically.•These compounds exhibit strong characteristic Ln3+ ions photo-luminescence emissions in visible regions.•Tb-Complex exhibits good water-stability and highly selective detection of highly toxic Hg2+ in aqueous solution. Two three dimensional (3D) lanthanide polymers namely, {[Tb2(bpda)3(H2O)3]·H2O}n (1) and {[Dy2(bpda)3(H2O)3]·H2O}n(2) have been synthesized with 2,2′-bipyridine-4,4′-dicarboxylic acid (H2bpda). Both 1 and 2 were characterized systematically by elemental analysis, infrared spectroscopy and thermogravimetric analysis. Single-crystal X-ray diffraction analysis shows that these two complexes are isostructural with 3D supermolecular structure. Complexes 1 and 2 exhibit characteristic luminescence on account of “antenna effect” of effective energy transfer from the ligands to the central Ln(III) ions. 1 reveals good water-stability and high detection sensitivity for Hg2+ in aqueous solution with the detection limit of 7.2 nM. In the meanwhile, the mechanism of fluorescence sensitization has also been analyzed.
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ISSN:0020-1693
1873-3255
DOI:10.1016/j.ica.2019.119370