Photophysics of some common fluorescence standards

Meech, Stephen R.; Phillips, David

doi:10.1016/0047-2670(83)80061-6

Cited by 755 publications

(481 citation statements)

References 39 publications

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“…The luminescence quantum yield values for overall energy transfer for the Tb(III) complexes were measured relative to quinine sulfate ( = 0.546). 41 The  values range from 0.40 for Tb-Amide to 0 for Tb-OCH 3 and Tb-NO 2 . From these data it can be seen that generally, the  values increase with T 0-0 (Figure 4), which can be attributed in part to the increase in the T 0-0 -5 D 4 energy gap, which decreases non-radiative deactivation caused by repopulation of the triplet via back-transfer from the 5 D 4 state (i.e.…”

Section: Resultsmentioning

confidence: 99%

Predicting Efficient Antenna Ligands for Tb(III) Emission

Samuel

Raymond

2008

Inorg. Chem.

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ABSTRACT:A series of highly luminescent Tb(III) complexes of para-substituted 2-hydroxyisophthalamide ligands (5LI-IAM-X) has been prepared (X = H, CH 3 , (C=O)NHCH 3 , SO 3 -, NO 2 , OCH 3 , F, Cl, Br) to probe the effect of substituting the isophthalamide ring on ligand and Tb(III) emission in order to establish a method for predicting the effects of chromophore modification on Tb(III) luminescence. The energies of the ligand singlet and triplet excited states are found to increase linearly with the -withdrawing ability of the substituent. The experimental results are supported by 2 time-dependent density functional theory (TD-DFT) calculations performed on model systems, which predict ligand singlet and triplet energies within ~5% of the experimental values. The quantum yield () values of the Tb(III) complex increases with the triplet energy of the ligand, which is in part due to the decreased non-radiative deactivation caused by thermal repopulation of the triplet. Together, the experimental and theoretical results serve as a predictive tool that can be used to guide the synthesis of ligands used to sensitize lanthanide luminescence.

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Section: Resultsmentioning

confidence: 99%

Predicting Efficient Antenna Ligands for Tb(III) Emission

Samuel

Raymond

2008

Inorg. Chem.

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“…44 Elemental analyses were performed by Dr. H. Eder from the Microchemical Laboratory of the University of Geneva.…”

Section: H Andmentioning

confidence: 99%

Tuning facial–meridional isomerisation in monometallic nine-co-ordinate lanthanide complexes with unsymmetrical tridentate ligands

et al. 2004

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The unsymmetrical tridentate benzimidazole-pyridine-carboxamide units in ligands L1-L4 react with trivalent lanthanides, Ln III, to give the nine-co-ordinate triple-helical complexes [Ln(Li ) 3 ] 3ϩ (i = 1-4) existing as mixtures of C 3 -symmetrical facial and C 1 -symmetrical meridional isomers. Although the β 13 formation constants are 3-4 orders of magnitude smaller for these complexes than those found for the D 3 -symmetrical analogues [Ln(Li ) 3 ] 3ϩ (i = 5-6) with symmetrical ligands, their formation at the millimolar scale is quantitative and the emission quantum yield ofisomerisation process in acetonitrile is slow enough for Ln = Lu III to be quantified by 1 H NMR below room temperature. The separation of enthalpic and entropic contributions shows that the distribution of the facial and meridional isomers can be tuned by the judicious peripheral substitution of the ligands affecting the interstrand interactions. Molecular mechanics (MM) calculations suggest that one supplementary interstrand π-stacking interaction stabilises the meridional isomers, while the facial isomers benefit from more favourable electrostatic contributions. As a result of the mixture of facial and meridional isomers in solution, we were unable to obtain single crystals of 1 : 3 complexes, but the X-ray crystal structures of their nine-co-ordinate precursors [Eu(L1) 2 (CF 3 SO 3 ) 2 (H 2 O)](CF 3 SO 3 )(C 3 H 5 N) 2 (H 2 O) (6, C 45 H 54 EuF 9 N 10 O 13 S 3 , monoclinic, P2 1 /c, Z = 4) and [Eu(L4) 2 (CF 3 SO 3 ) 2 (H 2 O)](CF 3 SO 3 )(C 4 H 4 O) 1.5 (7, C 51 H 66 EuF 9 N 8 O 15.5 S 3 , triclinic, P1, Z = 2) provide crucial structural information on the binding mode of the unsymmetrical tridentate ligands.

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“…Luminescence quantum yields (uncertainty AE15%) were determined using quinine sulfate in 0.5 M H 2 SO 4 aqueous solution (U ¼ 0:546 [12]). In order to allow comparison of emission intensities, corrections for instrumental response, inner filter effects, and phototube sensitivity were performed.…”

Section: Photophysical Measurementsmentioning

confidence: 99%

Synthesis, photophysical characterisation and metal ion binding properties of new ligands containing anthracene chromophores

Bolletta

Garelli²,

Montalti³

et al. 2004

Inorganica Chimica Acta

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Two new fluorescent chemosensors for heavy metal ions have been synthesised and their photophysical properties have been investigated. They present a pyridyl-thioether-based binding site and the anthracene moiety as a chromophore. In the experimental conditions used, no evidence is found for the formation of complexes with Pb 2þ , Zn 2þ , Cd 2þ , and Ag þ ions. On the contrary, in acetonitrile solutions both ligands strongly bind Cu 2þ and Hg 2þ cations according to a 1:1 and a 1:2 (metal:ligand) stoichiometry. In these complexes, the intense luminescence typical of anthracene derivatives is almost completely quenched and this phenomenon can be mainly attributed to an intraligand electron transfer process from the anthracene chromophore to the complexed pyridine. These results are of interest for the development of new chemosensors for the design of efficient electronic tongues for the detection of transition metal ions.

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Photophysics of some common fluorescence standards

Cited by 755 publications

References 39 publications

Predicting Efficient Antenna Ligands for Tb(III) Emission

Predicting Efficient Antenna Ligands for Tb(III) Emission

Tuning facial–meridional isomerisation in monometallic nine-co-ordinate lanthanide complexes with unsymmetrical tridentate ligands

Synthesis, photophysical characterisation and metal ion binding properties of new ligands containing anthracene chromophores

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