Syntheses, Structures, and Photophysical Properties of Eu and Lu Diketonates with a Neutral Polydentate Imidazolylmethanamine Ligand

Kisel, Kristina S.; Linti, Gerald; Старова, Галина Л.; Sizov, V. V.; Melnikov, Alexei S.; Pushkarev, Anatoly P.; Bochkarev, M. N.; Grachova, Elena V.; Tunik, Sergey P.

doi:10.1002/ejic.201403186

Cited by 10 publications

(4 citation statements)

References 66 publications

(195 reference statements)

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“…Luminescent β-diketonate complexes of lanthanide ions possess attractive properties (i.e., high quantum yield, high brightness, narrow band emission) which candidate them as promising materials for a wide range of applications. In particular, [Ln(β-diketonate) 3 L] containing an additional bidentate or tridentate chromophore are gaining increasing attention for technological application such as organic emitting layers in light-emitting diodes (OLED) − and as solar concentrators. − The main disadvantages concerning practical applicability of the Ln 3+ β-diketonate complexes are connected to the rather low thermal and photochemical stability. In order to overcome these drawbacks, they have been incorporated into polymers, mesoporous materials , and organic–inorganic hybrid materials. − …”

Section: Introductionmentioning

confidence: 99%

Circularly Polarized Luminescence from an Eu(III) Complex Based on 2-Thenoyltrifluoroacetyl-acetonate and a Tetradentate Chiral Ligand

et al. 2018

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A new chiral complex {[EuL(tta)(HO)]CFSO; L = N, N'-bis(2-pyridylmethylidene)-1,2-( R, R + S, S)-cyclohexanediamine; tta = 2-thenoyltrifluoroacetyl-acetonate} has been synthesized and characterized from a structural and spectroscopic point of view. The molecular structure in the solid state shows the presence of one chiral L, two tta, and one water molecules bound to the metal center. L and tta molecules can efficiently harvest and transfer to Eu(III) the UV light absorbed in the 250-400 nm range. The forced electric-dipole D → F emission band dominates the Eu(III) emission spectra recorded in the solid state and in solution of acetonitrile or methanol and the calculated intrinsic quantum yield of the metal ion is around 40-50%. The light emitted by the enantiopure complex shows a sizable degree of polarization with a maximum value of the emission dissymmetry factor ( g) equal to 0.2 in methanol solution. If compared with the complex in the solid state or in acetonitrile solution, then the first coordination sphere of Eu(III) when the complex is dissolved in methanol is characterized by the presence of one CHOH molecule instead of water. This fact is related to different Eu(III) CPL signatures in the two solvents.

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Section: Introductionmentioning

confidence: 99%

Circularly Polarized Luminescence from an Eu(III) Complex Based on 2-Thenoyltrifluoroacetyl-acetonate and a Tetradentate Chiral Ligand

et al. 2018

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“…According to the literature, the intramolecular energy transfer in the Eu 3+ -indomethacinate complexes can be divided into two mechanisms, which is shown in Figure 7. 27,28 For the first mechanism, indomethacinate ligand absorbs energy being excited to its S 1 states, and subsequently transfers this energy to the T 1 excited state belonging to heterocyclic ligand (Figure 7). Therefore, this latter ligand undergoes energy transfer from the intraligand triplet state to 5 D 1 or 5 D 0 levels of the Eu 3+ ion (T 1 → 5 D 1 → 5 D 0 ), followed by radiative and non-radiative deactivation centered on the central metal ion ( 5 D 0 → 5 F J ).…”

Section: Luminescence Spectra Of the Eu 3+mentioning

confidence: 99%

“…The radiative rates (A rad ) of the Eu 3+ -indomethacinate complexes were determined taking into account the following equation: 27 (1)…”

Section: Luminescence Spectra Of the Eu 3+mentioning

confidence: 99%

Rare Earth-Indomethacinate Complexes with Heterocyclic Ligands: Synthesis and Photoluminescence Properties

Filho¹,

Santos²,

Vale³

et al. 2017

J. Braz. Chem. Soc.

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In this work, synthesis, characterization and photophysical properties of trivalent rare earth complexes with a nonsteroidal anti-inflammatory drug [the indomethacinate (indo), presenting formulas RE(indo) 3 (H 2 O) x (x = 3, for Eu 3+ and Gd 3+ , and x = 4 for Tb 3+), RE(indo) 3 (bipy) and RE(indo) 3 (phen) (bipy: 2,2'-bipyridine, and phen: 1,10-phenanthroline)] were investigated. Based on photoluminescent results, the intramolecular energy transfer process from T 1 triplet states of indo, phen and bipy ligands to the 5 D 0 emitting level of the Eu 3+ ion in the coordination compounds is discussed. Accordingly, it is proposed two possible intramolecular energy transfer mechanisms between indomethacinate ligand and rare earth ions, which involve the participation of excited electronic states of the heterocyclic ligands as intermediate ones.

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“…Слабые коэффициенты поглощения f-f-переходов в ионах РЗЭ преодолеваются путем введения соответствующих органических лигандов в их координационную сферу (хорошо известный «антенный эффект»). Органические лиганды поглощают энергию и переводят ее в возбужденные состояния ионов РЗЭ [11,14].…”

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Complex formation of REEs with polydentate organic ligands

2020

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Исследовано комплексообразование европия и тербия с полифункциональными органическими соединениями – β-дикетонами, органическими кислотами. Состав комплексов изучен экстракционным методом, ИК и люминесцентной спектроскопией. Установлено, что при экстракции РЗЭ смешанными экстрагентами идет эффективное комплексообразование РЗЭ в органической фазе. Показана возможность синтеза из насыщенных экстрактов разнолигандных координационных соединений РЗЭ, выделены индивидуальные кристаллические комплексы. The complex formation of europium and terbium with polyfunctional organic compounds: β-diketones, organic acids were investigated. The composition of the complexes was studied by extractive method, infrared and luminescent spectroscopy. It was established that during the extraction of REE by mixed extractants there is an effective complex formation of REE in the organic phase. The possibility of synthesis of different ligand coordination compounds of REE from saturated extracts was shown and individual crystalline complexes were isolated.

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Syntheses, Structures, and Photophysical Properties of Eu and Lu Diketonates with a Neutral Polydentate Imidazolylmethanamine Ligand

Cited by 10 publications

References 66 publications

Circularly Polarized Luminescence from an Eu(III) Complex Based on 2-Thenoyltrifluoroacetyl-acetonate and a Tetradentate Chiral Ligand

Circularly Polarized Luminescence from an Eu(III) Complex Based on 2-Thenoyltrifluoroacetyl-acetonate and a Tetradentate Chiral Ligand

Rare Earth-Indomethacinate Complexes with Heterocyclic Ligands: Synthesis and Photoluminescence Properties

Complex formation of REEs with polydentate organic ligands

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