Infrared Spectrum of Europium Acetylacetonate

Liang, Changhao; Schimitschek, Erhard J.; Stephens, D. H.; Trias, John A.

doi:10.1063/1.1840908

Cited by 22 publications

(3 citation statements)

References 12 publications

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“…According to the literature, a few absorption bands which are characteristic of Eu(acac) 3 are seen at around 1600-1200 cm −1 . 24 More specifically, three bands with very strong absorption are known to appear at 1600 cm −1 , 1515 cm −1 and 1450 cm −1 that can be attributed to CvC stretching, CvO stretching and the combination of C-H bending and CvO stretching, respectively. Another strong absorption should appear at around 1258 cm −1 , being ascribed to the combination of C-CH 3 stretching and CvC stretching.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Eu(iii) acetylacetonate-doped well-defined titania particles with efficient photoluminescence properties

2018

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The aggregation/dispersion of luminescent species is a critical factor that determines their luminescence properties. In this study, europium(iii) acetylacetonate (Eu(acac)) was doped into a titania matrix to form Eu(acac)-doped titania particles with well-defined size and shape through a microreactor-based sol-gel approach. The morphology and structure of the as-synthesized products were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, scanning transmission electron microscopy and X-ray diffraction measurements. The Eu/Ti value of the products varied in the range from 0.125 to 5.0 and the resulting luminescence properties were examined. It should be noted that there was an optimum Eu/Ti value that exhibited the strongest luminescence. A possible reason for this phenomenon can be explained on the basis of a balance between the inter-molecular distance of Eu(acac) and its doped amount. The effects of the crystal phase of the titania matrix on luminescence behavior were also investigated. As a result, Eu(acac)-doped amorphous titania demonstrated more efficient luminescence than that after calcined at 550 °C for 6 h to convert amorphous to anatase probably because of the aggregation of Eu species on the crystallite surface. The stability of the present Eu(acac)-doped titania was confirmed by preparing thin films on a glass substrate and by applying UV/ozone treatment. As compared to bare Eu(acac), degradation in luminescence was suppressed in the case of Eu(acac)-doped titania. Thus, the present titania-based hybrid with controlled Eu(acac) doping is useful as a stable, luminescent material for optical, biological and environmental applications.

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Section: Resultsmentioning

confidence: 99%

Preparation of Eu(iii) acetylacetonate-doped well-defined titania particles with efficient photoluminescence properties

2018

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“…In addition, the shape of the absorption band due to the OH group is changed because the ODA is removed by the solvent extraction process and the state of the adsorbed water is changed. Importantly, Eu(acac) 3 is still present after the solvent extraction as we see some characteristic absorptions in the spectra for Solv- 0.5 -Eu/Ti and Solv- 2.0 -Eu/Ti . Although some amount of the adsorbed Eu(acac) 3 is removed together with ODA by the extraction, there is no change in the PL intensity area between 604 and 640 nm per 1 mol of the Eu(acac) 3 .…”

Section: Resultsmentioning

confidence: 80%

“…Importantly, Eu(acac) 3 is still present after the solvent extraction as we see some characteristic absorptions in the spectra for Solv-0.5-Eu/ Ti and Solv-2.0-Eu/Ti. 48 Although some amount of the adsorbed Eu(acac) 3 is removed together with ODA by the extraction, there is no change in the PL intensity area between 604 and 640 nm per 1 mol of the Eu(acac) 3 . Furthermore, internal quantum yields are almost equivalent between the samples before and after removing ODA (data not shown), indicating that the solvent extraction does not affect the fluorescent property but simply works to remove biotoxic ODA molecules.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Preparation of Monodispersed Nanoporous Eu(III)/Titania Loaded with Ibuprofen: Optimum Loading, Luminescence, and Sustained Release

et al. 2021

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Functional nanomaterials are one of the potential carriers for drug delivery, whereas there are many prerequisites for this purpose. The carrier should be monodispersed, be fluorescent, and have a proper nanostructure to keep/release drug molecules to achieve controlled release, although preparing a nanomaterial which fulfills all the demands is still very challenging. In this paper, we show the preparation of monodispersed nanoporous amorphous titania submicron particles with fluorescent property. They adsorb a model drug moleculeibuprofenwith their surface coverage up to 100%. Such a perfect loading does not decrease the fluorescent intensity because of any quenching effects but even maximize it. We also demonstrate the release behavior of IBU into simulated body fluid. Interestingly, the present carrier releases most of IBU in 6 h, whereas that modified with the polyethylene glycol moiety takes 48 h to finish releasing IBU, indicating its potential for controlled release applications.

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Über den Bindungscharakter in β‐Diketon‐Metallchelaten

et al. 1971

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Die Schwingungsspektren 'H-, ' 3C-und "0-markierter Molekiile zeigen an, daJ in allen untersuchten Metallchelaten des 2,4-Pentandions (Acetylacetons) der Ausgleich zwischen Doppel-und Einfachbindungen im sechsgliedrigen Ring uollstandig ist, im 2,4-Pentandion selbst jedoch nicht. Quecksilber dagegen bindet die Liganden am mittleren C-Atom. Die Kernresonanzspektren der Metallchelate des 3-Mesityl-und 3-Anthryl-2,4-pentandions lassen erkennen, daJ die Chelatringe keine mit der des Benzols vergleichbare magnetische Anisotropie besitzen. Es wird kritisch erwogen, wieweit es iiberhaupt sinnil011 ist, den Bindungszustand solcher Molekiile mit einem ,,aromatischen Charakter" in Beziehung zu bringen und warum alle Vergleiche in der chemischen Reaktionsjihigkeit mit der des Benzols bisher zu umstrittenen Aussagen iiber den Bindungscharakter in den Metallchelaten des Pentandions gefihrt haben.

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Infrared Spectrum of Europium Acetylacetonate

Cited by 22 publications

References 12 publications

Preparation of Eu(iii) acetylacetonate-doped well-defined titania particles with efficient photoluminescence properties

Preparation of Eu(iii) acetylacetonate-doped well-defined titania particles with efficient photoluminescence properties

Preparation of Monodispersed Nanoporous Eu(III)/Titania Loaded with Ibuprofen: Optimum Loading, Luminescence, and Sustained Release

Über den Bindungscharakter in β‐Diketon‐Metallchelaten

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