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Issue 15, 2018
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Layered rare-earth hydroxide (LRH, R = Tb, Y) composites with fluorescein: delamination, tunable luminescence and application in chemosensoring for detecting Fe(III) ions

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Abstract

We demonstrate a novel example of tunable luminescence and the application of the delaminated FLN/OS-LRH composites (LRHs are layered rare-earth hydroxides, R = Tb, Y; FLN is the fluorescein named 2-(6-hydroxy-3-oxo-(3H)-xanthen-9-yl)benzoic acid; OS is the anionic surfactant 1-octane sulfonic acid sodium) in detecting Fe(III) ions. The FLNxOS1−x species (x = 0.02, 0.05, 0.10, and 0.20) are intercalated into the LTbyY1−yH layers (y = 1, 0.9, 0.7, 0.5, 0.3, 0.1 and 0) by ion exchange reactions to yield the composites FLNxOS1−x-LTbyY1−yH. In the solid state, the LYH composites display green emission (564 nm) arising from the organic FLN, while in LTbH composites, the luminescence of the Tb3+ in the layers (545 nm) and the FLN in the interlayers is co-quenched. In the delaminated state in formamide (FM), FLNxOS1−x-LTbH composites display green to yellowish-green luminescence (540–574 nm) following the increasing FLN/OS ratio; while the FLN0.02OS0.98-LTbyY1−yH composites show green emission at ∼540 nm. The fluorescence lifetimes of the composites (4.22–4.63 ns) are comparable to the free FLN-Na, and the quantum yields (31.62–78.70%) of the composites especially that (78.70%) of the FLN0.02OS0.98-LYH are much higher than that (28.40%) of free FLN-Na. The recognition ability of the FLN0.02OS0.98-LYH composite for metal cations is researched. The delaminated FLN0.02OS0.98-LYH colloidal suspension exhibits high selectivity for Fe3+ over other ions (Mg2+, Al3+, Ni2+, Co2+, Cu2+, Zn2+, Mn2+, Pb2+, and Cd2+) with fluorescence quenching, which can work as a kind of turn-off fluorescence sensor for the detection of Fe3+. The detection limit of Fe3+ is determined to be 2.58 × 10−8 M and the quenching constant (Ksv) is 1.70 × 103 M−1. This is the first work on LRH materials working as a chemosensor for recognising metal cations. It provides a new approach for the design of LRH materials to be applied in fluorescence chemosensing.

Graphical abstract: Layered rare-earth hydroxide (LRH, R = Tb, Y) composites with fluorescein: delamination, tunable luminescence and application in chemosensoring for detecting Fe(iii) ions

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Publication details

The article was received on 31 Jan 2018, accepted on 09 Mar 2018 and first published on 12 Mar 2018


Article type: Paper
DOI: 10.1039/C8DT00409A
Citation: Dalton Trans., 2018,47, 5380-5389
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    Layered rare-earth hydroxide (LRH, R = Tb, Y) composites with fluorescein: delamination, tunable luminescence and application in chemosensoring for detecting Fe(III) ions

    F. Su, R. Guo, Z. Yu, J. Li, Z. Liang, K. Shi, S. Ma, G. Sun and H. Li, Dalton Trans., 2018, 47, 5380
    DOI: 10.1039/C8DT00409A

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