Quenching of excited states by lanthanide ions and chelates in solution

Buono-Core, G.E.; Li, H.; Marciniak, Bronisław

doi:10.1016/0010-8545(90)80060-7

Cited by 304 publications

(142 citation statements)

References 95 publications

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“…The second process is important for lanthanide containing compounds because intersystem crossing rates (isc) are enhanced by paramagnetic and heavy atom effects. 43 This is exemplified by the quantum yield of the ligand-centered fluorescence of the Gd III helicate in H 2 O which amounts to only 0.93%, 11 down from 5% for the free ligand. A similar, but much more pronounced trend is observed for the Sm III helicate that presents a very small quantum yield in D 2 O, 0.03%, compared to 12% for the free ligand.…”

Section: Modeling Of the Energy Transfer Processesmentioning

confidence: 99%

“…The large k 32 value is typical of a heavy-atom effect. 43 The lifetime of the 1 ππ* emission in the helicate depends on the energy transfer rate constants to the Sm III upper excited b From absorption spectra in H2O at 293 K; sh ) shoulder. Figure 4 for the numbering of the states and, therefore, the labeling of the rate constants.…”

Section: Modeling Of the Energy Transfer Processesmentioning

confidence: 99%

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Visible and Near-Infrared Luminescence of Lanthanide-Containing Dimetallic Triple-Stranded Helicates: Energy Transfer Mechanisms in the Sm^III and Yb^III Molecular Edifices

et al. 2002

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The photophysical properties of the triple-stranded dimetallic helicates [Ln 2 (L C -2H) 3 ]‚H 2 O (Ln ) Nd, Sm, Dy, Yb) are determined in water and D 2 O solutions, and energy transfer processes are modeled for Sm III . The luminescence of Nd III , Sm III , and Yb III is sensitized by (L C -2H) 2-, but the energy transfer from the ligand to the Ln III ions is not complete, resulting in residual ligand emission. The luminescence of the Nd III helicate is very weak due to nonradiative de-excitation processes. On the other hand, the Yb III and Sm III helicates exhibit fair quantum yields, 1.8% and 1.1% in deuterated water, respectively. The energy transfer rates between (L C -2H) 2-and Sm III levels are calculated by direct and exchange Coulomb interaction models. This theoretical modeling coupled to numerical solutions of the rate equations leads to an estimate of the emission quantum yields in H 2 O and D 2 O, which compares favorably with experimental data. The main component of the ligandto-metal energy transfer (97.5%) goes through a 3 ππ* f 5 G 5/2 (1) path, and the operative mechanism is of the exchange type. For the Yb III helicate, minor effects of oxygen on the sensitization of Yb III and nanosecond time-resolved spectroscopy point to the energy transfer mechanism being consistent with a recently proposed pathway involving fast electron transfer and Yb II . No up-conversion process could be identified. Ligand-field splitting of the 2 F 5/2 (3E 1/2 + E 3/2 ) and 2 F 7/2 (2E 1/2 + E 3/2 ) levels of Yb III is consistent with D 3 symmetry.

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Section: Modeling Of the Energy Transfer Processesmentioning

confidence: 99%

Section: Modeling Of the Energy Transfer Processesmentioning

confidence: 99%

Visible and Near-Infrared Luminescence of Lanthanide-Containing Dimetallic Triple-Stranded Helicates: Energy Transfer Mechanisms in the Sm^III and Yb^III Molecular Edifices

et al. 2002

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“…Especially, Eu 3+ , Tb 3+ and Sm 3+ ions have excellent luminescence properties, but their excitation bands are weak and narrow. In order to enhance excitation spectrum, lanthanide (Ln 3+ ) ions are usually coordinated with ligands that have broad intense excitation bands and can redshift of excitation spectrum to UV/Blue range [8]. In these systems intense ion luminescence originates from the intramolecular energy transfer through the excited state of the ligand to the emitting level of the lanthanide central ions that give a sharp narrow spectral character [9].…”

Section: Introductionmentioning

confidence: 99%

New Narrow-Band Luminescence Using Lanthanide Coordination Compounds for Light-Emitting Diodes

Ryu

et al. 2017

IEICE Trans. Electron.

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“…The different optical properties caused by the different choose of metal ions, ligands and collaborative ligands have found widespread application in various fields [4][5][6]. As an extension of work on the structural characterization of arylhydrazone derivatives, the title compound was synthesized and its crystal structure is reported here.…”

mentioning

confidence: 99%

Crystal structure of of the supramolecular complex Eu(sal)3phen2, C45H31EuN4O9

Zhu

Wang

Zhang

et al. 2013

Zeitschrift Für Kristallographie - New Crystal Structures

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Quenching of excited states by lanthanide ions and chelates in solution

Cited by 304 publications

References 95 publications

Visible and Near-Infrared Luminescence of Lanthanide-Containing Dimetallic Triple-Stranded Helicates: Energy Transfer Mechanisms in the Sm^III and Yb^III Molecular Edifices

Visible and Near-Infrared Luminescence of Lanthanide-Containing Dimetallic Triple-Stranded Helicates: Energy Transfer Mechanisms in the Sm^III and Yb^III Molecular Edifices

New Narrow-Band Luminescence Using Lanthanide Coordination Compounds for Light-Emitting Diodes

Crystal structure of of the supramolecular complex Eu(sal)3phen2, C45H31EuN4O9

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Quenching of excited states by lanthanide ions and chelates in solution

Cited by 304 publications

References 95 publications

Visible and Near-Infrared Luminescence of Lanthanide-Containing Dimetallic Triple-Stranded Helicates: Energy Transfer Mechanisms in the SmIII and YbIII Molecular Edifices

Visible and Near-Infrared Luminescence of Lanthanide-Containing Dimetallic Triple-Stranded Helicates: Energy Transfer Mechanisms in the SmIII and YbIII Molecular Edifices

New Narrow-Band Luminescence Using Lanthanide Coordination Compounds for Light-Emitting Diodes

Crystal structure of of the supramolecular complex Eu(sal)3phen2, C45H31EuN4O9

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Product

Resources

About

Visible and Near-Infrared Luminescence of Lanthanide-Containing Dimetallic Triple-Stranded Helicates: Energy Transfer Mechanisms in the Sm^III and Yb^III Molecular Edifices

Visible and Near-Infrared Luminescence of Lanthanide-Containing Dimetallic Triple-Stranded Helicates: Energy Transfer Mechanisms in the Sm^III and Yb^III Molecular Edifices