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Structure, color-tunable luminescence, and UV-vis/NIR benzaldehyde detection of lanthanide coordination polymers based on two fluorinated ligands

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Abstract

Herein, by incorporating a strongly luminescent emissive ancillary fluorinated β-diketone ligand into lanthanide coordination polymers (LnCPs), a series of LnCPs, i.e. [Ln(tfbdc)0.5(bta)2(CH3OH)2]·CH3OH [Ln = La (1), Pr (2), Nd (3), Sm (4), and Eu (5)] and [Ln(tfbdc)0.5(bta)2(CH3OH)] [Ln = Tb (6), Dy (7), Ho (8), Er (9), and Yb (10)], have been isolated by reactions of LnCl3·6H2O with H2tfbdc (2,3,5,6-tetrafluoroterephthalic acid) and bta (benzoyltrifluoroacetone). Single-crystal X-ray diffraction analysis reveals that the complexes 1–10 exhibit a 1D zigzag chain structure, which differs from the 2D or 3D structure of the reported tfbdc-Ln complexes due to the introduction of the bta ligand. Moreover, the C–F bonds located in the fluorinated tfbdc and bta ligands can weaken the vibrational quenching effect on the luminescence properties partly and finally realize enhanced luminescence. Some systematic studies have been implemented to analyze the photoluminescence of these complexes. As an exception, the complexes 1–10 exhibit impressive UV-visible or NIR luminescence. By carefully regulating the relative intensity of the blue, green, and red (RGB) emission, a three-component white-light emitting complex 11 (La–Eu–Tb) has been realized. Moreover, the complexes 6 and 10 exhibit high sensitivity and selectivity of the UV-visible and NIR luminescence response to benzaldehyde, which act as promising luminescent sensors for the detection of benzaldehyde.

Graphical abstract: Structure, color-tunable luminescence, and UV-vis/NIR benzaldehyde detection of lanthanide coordination polymers based on two fluorinated ligands

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Publication details

The article was received on 03 Apr 2018, accepted on 20 Apr 2018 and first published on 24 Apr 2018


Article type: Paper
DOI: 10.1039/C8CE00516H
Citation: CrystEngComm, 2018, Advance Article
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    Structure, color-tunable luminescence, and UV-vis/NIR benzaldehyde detection of lanthanide coordination polymers based on two fluorinated ligands

    X. Yao, X. Wang, Y. Han, P. Yan, Y. Li and G. Li, CrystEngComm, 2018, Advance Article , DOI: 10.1039/C8CE00516H

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