Preparation, characterization and optical properties of rare earth complexes with derivatives of N-phenylanthranilic acid

Kasprzycka, Ewa; Assunção, Israel P.; Bredol, Michael; Lezhnina, Marina M.; Kynast, Ulrich

doi:10.1016/j.jlumin.2020.117818

Cited by 16 publications

(14 citation statements)

References 38 publications

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“…As one can see, the Δν values for the complexes are slightly lower but close to the sodium salt, indicating that the fluf ligand coordinates to Ln 3+ ions through a bidentate chelate coordination mode . These results are corroborated with the FTIR data reported in previous reports. ,, The coordination of ancillary ligands to the Ln 3+ ion was confirmed by the shift of the heteroaromatic C–N mode and the phosphine oxides (ν PO ) and sulfoxide (ν SO ) stretching modes to lower energies when compared with the free organic molecules, − as can be seen in Table S2.…”

Section: Resultssupporting

confidence: 86%

“…34 These results are corroborated with the FTIR data reported in previous reports. 27,33,35 The coordination of ancillary ligands to the Ln 3+ ion was confirmed by the shift of the heteroaromatic C−N mode and the phosphine oxides (ν P�O ) and sulfoxide (ν S�O ) stretching modes to lower energies when compared with the free organic molecules, 36−38 as can be seen in Table S2.…”

Section: Resultsmentioning

confidence: 88%

“…The partial energy level diagram for the Tb 3+ complexes (Figure a) indicates that the high luminescence intensity of the [Tb(fluf) 3 (L)] complexes (L: H 2 O, phen, tppo, topo, and dpso) can be attributed to the suitable energy gap between ligand-centered T 1 states and the main energy level of the Tb 3+ ion ( 5 D 4 ), i.e., Δ E ∼ 4080 cm –1 , that is beyond the optimum value of Δ E ∼ 2000 cm –1 to avoid as much as possible the energy back-transfer (BT) and the consequent efficiency loss . This experimental value is rather similar to those reported in the literature , and reveals a remarkable independence of T 1 energy values on the ancillary ligands.…”

Section: Photophysical Propertiesmentioning

confidence: 99%

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Luminescent Analysis of Eu³⁺ and Tb³⁺ Flufenamate Complexes Doped in PMMA Polymer: Unexpected Terbium Green Emission under Sunlight Exposure

Assunção

Costa

Santos

et al. 2022

ACS Appl. Opt. Mater.

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The design of efficient luminescent lanthanide materials with a wide range of different excitation wavelengths in the UVA, UVB, and UVC regions, as well as under sunlight exposure, is highly desirable for application as molecular light-converting devices. In this work, [Ln(fluf)3(L)] complexes (Ln3+: Eu, Gd, and Tb) and doped PMMA:(1%)Tb(fluf)3(L) films, where fluf stands for the flufenamate ligand and L is H2O, phen, tppo, topo, and dpso, were successfully prepared by a facile one-pot method, and their photophysical properties were also investigated. The Ln3+ compounds were characterized by elemental analysis, Fourier transform infrared absorption spectroscopy, thermogravimetric analysis, X-ray powder diffraction, and diffuse reflectance spectroscopy techniques. The Eu3+ complexes present very weak emission intensities at 300 K temperature, showing very low intrinsic quantum yield (Q Eu Eu) values due to a highly operative luminescence quenching by a low-lying ligand to metal charge transfer state. However, these values are significantly increased when obtained at low temperature (77 K). For Tb3+ complexes and the doped PMMA, polymeric films revealed an unprecedented bright emission under excitation at UVA, UVB, and UVC radiation. In addition, the doped polymers under sunlight exposure show the characteristic 5D4 → 7F6–0 transitions of the Tb3+ ion, exhibiting green emission color. These luminescent doped polymeric materials act as efficient energy harvesters and converters. Hence, the optical results show that the PMMA:(1%)Tb(fluf)3(L) photonic materials are highly versatile and desirable, presenting suitable application as efficient light-converting molecular devices and as luminescent solar concentrators.

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 88%

Section: Photophysical Propertiesmentioning

confidence: 99%

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Luminescent Analysis of Eu³⁺ and Tb³⁺ Flufenamate Complexes Doped in PMMA Polymer: Unexpected Terbium Green Emission under Sunlight Exposure

Assunção

Costa

Santos

et al. 2022

ACS Appl. Opt. Mater.

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“…We recently described a new series of green-emitting Tb 3+ complexes based on derivatives of N-phenylanthranilic acid (fenamic acid), with efficiencies up to 33% and decay times of 873 µs for Tb(meclofenamate) 3 (H 2 O) 2 for example. [27] The efficiency of the complexes could be greatly enhanced by co-coordination with an ancillary 5,5′-dimethyl-2,2bipyridine ligand (5,5'-dmbipy) to yield a quantum efficiency of 60% at a decay time of 1270 µs, this for the complex Tb(flufenamate) 3 (5,5′-dmbipy) (Fig. 1), [28] which www.publish.csiro.au/ch Australian Journal of Chemistry showed the largest gain over the non-co-coordinated complexes.…”

Section: Resultsmentioning

confidence: 99%

“…Species Tb(fluf) 3 (H 2 O), solid [ 27] Tb(fluf) 3 (5,5′-dmbp), solid [ 28] Tb 3+ E. coli Tb(fluf) interaction with functional groups of the bacteria. The long lifetimes will be an indispensable asset, exploitable in timegating analyses such as luminescent flow cytometry and time gated microscopy.…”

Section: Discussionmentioning

confidence: 99%

Long-lifetime green-emitting Tb

et al. 2022

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The present report describes a new approach to stain bacteria by means of rare earth complexes. We demonstrate with selected Gram-negative and positive bacteria (Escherichia coli, Micrococcus luteus, Bacillus megaterium) that these microbes can be stained efficiently with derivatives of N-phenylanthranilic acid, flufenamic acid in particular, and Tb3+ ions. Hence, the inherent advantages of rare earth complexes, e.g. strong optical absorption (>50 000 L × M−1 × cm−1) due to the antenna effect, large Stokes’ shifts (~10 000 cm−1) and very long emission decay times (millisecond range), and, not least, enhanced photostability can be fully exploited in fluorescence microscopy and spectroscopy of the bacteria; foreseeably, these findings will also be useful in flow cytometry and ELISA techniques.

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Blue fluorescent waterborne polyurethane‐based transition metal complexes with antibacterial activity

Hu,

Cheng,

Yang

et al. 2024

J of Applied Polymer Sci

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Efficient and stable blue fluorescent materials are the key components of light‐emitting devices and have received wide attention. Herein, transition metal complexes Zn(5‐AQ)2, Cu(5‐AQ)2, and Cd(5‐AQ)2 are prepared by using 5‐aminoquinoline (5‐AQ) as ligand and Zn2+, Cu2+, and Cd2+ as the central ions, respectively. Then, waterborne polyurethane (WPU)‐based transition metal complexes Zn(5‐AQ)2‐WPU, Cu(5‐AQ)2‐WPU, and Cd(5‐AQ)2‐WPU with different emission wavelengths of blue fluorescence are prepared by bonding Zn(5‐AQ)2, Cu(5‐AQ)2, and Cd(5‐AQ)2 to polyurethane chains as chain extenders, respectively. Noteworthily, with the increase of transition metal ion radius (Zn2+ < Cu2+ < Cd2+), the fluorescence emission wavelengths of the complexes showed different degrees of blue‐shift, and the blue‐shifted wavelengths showed a decreasing trend. Importantly, their fluorescence colors are blue‐shifted from blue‐green to blue with different emission wavelengths after accessing the polyurethane backbone, which has potential applications in the field of tuning white LED materials. The thermal decomposition temperatures of Zn(5‐AQ)2‐WPU, Cu(5‐AQ)2‐WPU, and Cd(5‐AQ)2‐WPU are above 220°C with good thermal stability, and their fluorescence lifetimes are prolonged by 8.817, 8.896, and 6.489 ns, respectively, compared with the complexes. Furthermore, WPU transition metal complexes with water as a dispersive medium have an antibacterial efficiency of up to 100% against Escherichia coli, which is an environmentally friendly antibacterial material with broad application prospects.

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Preparation, characterization and optical properties of rare earth complexes with derivatives of N-phenylanthranilic acid

Cited by 16 publications

References 38 publications

Luminescent Analysis of Eu³⁺ and Tb³⁺ Flufenamate Complexes Doped in PMMA Polymer: Unexpected Terbium Green Emission under Sunlight Exposure

Luminescent Analysis of Eu³⁺ and Tb³⁺ Flufenamate Complexes Doped in PMMA Polymer: Unexpected Terbium Green Emission under Sunlight Exposure

Long-lifetime green-emitting Tb

Blue fluorescent waterborne polyurethane‐based transition metal complexes with antibacterial activity

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Preparation, characterization and optical properties of rare earth complexes with derivatives of N-phenylanthranilic acid

Cited by 16 publications

References 38 publications

Luminescent Analysis of Eu3+ and Tb3+ Flufenamate Complexes Doped in PMMA Polymer: Unexpected Terbium Green Emission under Sunlight Exposure

Luminescent Analysis of Eu3+ and Tb3+ Flufenamate Complexes Doped in PMMA Polymer: Unexpected Terbium Green Emission under Sunlight Exposure

Long-lifetime green-emitting Tb

Blue fluorescent waterborne polyurethane‐based transition metal complexes with antibacterial activity

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Product

Resources

About

Luminescent Analysis of Eu³⁺ and Tb³⁺ Flufenamate Complexes Doped in PMMA Polymer: Unexpected Terbium Green Emission under Sunlight Exposure

Luminescent Analysis of Eu³⁺ and Tb³⁺ Flufenamate Complexes Doped in PMMA Polymer: Unexpected Terbium Green Emission under Sunlight Exposure