Europium and Terbium<i>tris</i>(Dipicolinates) as Secondary Standards for Quantum Yield Determination

Chauvin, Anne‐Sophie; Gumy, Frédéric; Imbert, Daniel; Bünzli, Jean‐Claude G.

doi:10.1081/sl-120039700

Cited by 242 publications

(264 citation statements)

References 29 publications

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“…In order to compare the values of f Ln determined from the PA method with those from the empirical approach, intrinsic quantum yields for EuA C H T U N G T R E N N U N G (bta) 3 L 2 and EuA C H T U N G T R E N N U N G (tta) 3 L 2 are also determined at room temperature by calculating the radiative lifetime of Eu 3 + ( 5 D 0 level) from the emission spectra. [26] The results are shown in Table 1. It can be seen that there are deviations between the values obtained from the PA method and those obtained from the emission spectra.…”

Section: Resultsmentioning

confidence: 85%

“…7 F 1 ) is independent of the environment, [26] where A MD = 14.65 s À1 is the spontaneous emission probability of the 5 D 0 ! 7 F 1 transition in vacuum, n is the refractive index of the medium, and I tot /I MD is the ratio of the total emission area to the area of the 5 D 0 !…”

Section: Methodsmentioning

confidence: 99%

“…7 F 1 transition is independent of the chemical environment of the ion, and that the radiative lifetime can be calculated from its emission spectrum. [26][27][28][29][30][31] The photoacoustic (PA) technique is the complement of luminescence spectroscopy. The PA signal is obtained by detecting the heat generated through the nonradiative relaxation re-leased by the sample after absorbing periodically modulated incident light.…”

Section: Introductionmentioning

confidence: 99%

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Listening to Lanthanide Complexes: Determination of the Intrinsic Luminescence Quantum Yield by Nonradiative Relaxation

Yang

Liu

et al. 2008

ChemPhysChem

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The photophysical properties of lanthanide complexes have been studied extensively; however, fundamental parameters such as the intrinsic quantum yield as well as radiative and nonradiative decay rates are difficult or even impossible to measure experimentally. Herein, a photoacoustic (PA) method is proposed to determine the intrinsic quantum yield of lanthanide complexes with lifetimes in the order of milliseconds. This method is used to determine the intrinsic quantum yields for europium(III)‐containing metallomesogens as well as terbium(III) complexes. The results show that the PA signal is sensitive to both the lifetime and the ratio of the fast‐to‐slow heat component of the samples. It is found that there is an efficient ligand sensitization and a moderate intrinsic quantum yield for the complexes. The intrinsic quantum yield of Eu3+ in the metallomesogens exhibits an obvious increase upon the isotropic liquid to smectic A transition. The proposed PA method is quite simple, and can contribute to a clearer understanding of the photophysical processes in luminescent lanthanide complexes.

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Section: Resultsmentioning

confidence: 85%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Listening to Lanthanide Complexes: Determination of the Intrinsic Luminescence Quantum Yield by Nonradiative Relaxation

Yang

Liu

et al. 2008

ChemPhysChem

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“…[1][2][3][4][5][6][7] Chauvin et al have proposed the use of Cs 3 [Ln(dpa) 3 ] complexes as secondary standards for luminescent quantum yield determination. 8,9 Dpa ligands have also been studied for their interactions with transition metal ions, 10 and in particular amide derivatives of dpa have been studied extensively, including for use in the formation of transition metal-containing interlocked systems, [11][12][13] as a ligand in Cu(II)-promoted hydroxylation of THF 14 as well as coordination chemistry with Ln(III) ions. 15 Our own research group has recently employed such amide derivatives of dpa in the formation of highly symmetrical and chiral luminescent bundles, 16 helicates 17 and half-helicates 18 templated via Ln(III)-directed self-assembly.…”

Section: Terdentate Ligandsmentioning

confidence: 99%

The btp [2,6-bis(1,2,3-triazol-4-yl)pyridine] binding motif: a new versatile terdentate ligand for supramolecular and coordination chemistry

2014

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Ligands containing the btp [2,6-bis(1,2,3-triazol-4-yl)pyridine] motif have appeared with increasing regularity over the last decade. This class of ligands, formed in a one pot 'click' reaction, has been studied for various purposes, such as for generating d and f metal coordination complexes and supramolecular self-assemblies, and in the formation of dendritic and polymeric networks, etc. This review article introduces btp as a novel and highly versatile terdentate building block with huge potential in inorganic supramolecular chemistry. We will focus on the coordination chemistry of btp ligands with a wide range of metals, and how it compares with other classical pyridyl and polypyridyl based ligands, and then present a selection of applications including use in catalysis, enzyme inhibition, photochemistry, molecular logic and materials, e.g. polymers, dendrimers and gels. The photovoltaic potential of triazolium derivatives of btp and its interactions with anions will also be discussed.

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“…6 In fact, the Tb(III) and Eu(III) complexes of this ligand have been proposed as useful secondary standards for the quantum yield determinations of Ln(III) complexes. 7,8 We demonstrated that the PYZ 2− dianion is also an efficient sensitizer for Eu(III), forming a highly luminescent Cs 3 [Eu-(PYZ) 3 ]·7H 2 O complex in the solid state. However, in dilute aqueous solution, the isolated complex rapidly hydrolyses, resulting in a loss of metal centered emission.…”

Section: Introductionmentioning

confidence: 99%

A comparison of sensitized Ln(iii) emission using pyridine- and pyrazine-2,6-dicarboxylates – part II

et al. 2013

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The synthesis, X-ray structures and photophysical properties of several new Ln(III) complexes with the dianion of pyrazine-2,6-dicarboxylic acid (H 2 PYZ) that demonstrate excellent stability and solubility in non-aqueous solution are reported, and compared to structurally analogous complexes derived from pyridine-2,6-dicarboxylic acid (H 2 DPA). The Eu(III) and Yb(III) complexes demonstrate efficient metal centered luminescence in the visible and Near Infra-Red (NIR) regions, respectively. Low temperature (77 K) phosphorescence measurements using the corresponding Gd(III) complex has allowed the photophysical properties of the sensitizer to be rationalized, together with corresponding TD-DFT studies for a model complex. Lastly, we have evaluated the sensitization efficiencies for these complexes, and have undertaken femtosecond transient absorption (TA) measurements in order to evaluate the relative importance of the intersystem crossing and energy transfer processes involved with sensitized Ln(III) emission via the antennae effect.

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Europium and Terbiumtris(Dipicolinates) as Secondary Standards for Quantum Yield Determination

Cited by 242 publications

References 29 publications

Listening to Lanthanide Complexes: Determination of the Intrinsic Luminescence Quantum Yield by Nonradiative Relaxation

Listening to Lanthanide Complexes: Determination of the Intrinsic Luminescence Quantum Yield by Nonradiative Relaxation

The btp [2,6-bis(1,2,3-triazol-4-yl)pyridine] binding motif: a new versatile terdentate ligand for supramolecular and coordination chemistry

A comparison of sensitized Ln(iii) emission using pyridine- and pyrazine-2,6-dicarboxylates – part II

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