The effect of 4-halogenobenzoate ligands on luminescent and structural properties of lanthanide complexes: experimental and theoretical approaches

Monteiro, Jorge H. S. K.; Bettencourt‐Dias, Ana de; Mazali, Ítalo Odone; Sígoli, Fernando Aparecido

doi:10.1039/c4nj01701c

Cited by 37 publications

(27 citation statements)

References 40 publications

(60 reference statements)

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“…The presence of the LMCT state can be proved by the differences in the diffuse reflection (DR) spectra of complexes with and without LMCT . Indeed, DR spectra of Eu(pam) 3 (H 2 O) 4 and Gd(pam) 3 (H 2 O) 4 differ significantly, which indicates the presence of the LMCT absorption band at about 350 nm.…”

Section: Resultsmentioning

confidence: 99%

Luminescence Enhancement by p‐Substituent Variation

et al. 2016

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The search for precursors of luminescent biomarkers is carried out among highly luminescent, stable, and soluble lanthanide p‐substituted fluorobenzoates, which were synthesized and thoroughly characterized. Examination of their crystal structure revealed the dependence of the structure on the lanthanide ion and on the separation method, because of the high acidity of the selected compounds. The brightness of the luminescence of the terbium and europium complexes varies significantly with both absorption and photoluminescence quantum yields (PLQYs), and the latter reaches 62 %.

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Section: Resultsmentioning

confidence: 99%

Luminescence Enhancement by p‐Substituent Variation

et al. 2016

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“…The JO intensity parameters Ω 2 and Ω 4 are strongly correlated with the symmetry around the Ln III ion. [57][58][59] In the Q + [Eu(tta) 4 ]series the value of the Ω 2 intensity parameter increased, while the Ω 4 ones decreased, which means that there was a decrease in the microsymmetry along the series. This result corroborates with the previous discussion about the emission spectra.…”

Section: Resultsmentioning

confidence: 99%

The Influence of Different Ammonium Cations on the Optical Properties of Tetrakis GdIII and EuIII Complexes

Adati¹,

Monteiro²,

Cardoso³

et al. 2019

J. Braz. Chem. Soc.

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A series of tetrakis-b-diketonate Q + [Ln(b-dik) 4 ]-, where Ln = Gd III or Eu III , Q = ammonium cations and b-dik = tta (2-thenoyltrifluoracetone) or bmdm (1-(4-tert-butylphenyl)-3-(4-methoxyphenyl)-1,3-propanedione) have been synthesized and characterized. The environment surrounding the Eu III ion depends on the lateral groups of the ligand and on the alkyl chains of the counter ion Q. The shortest lifetime (τ) = 0.29 ms, and lowest quantum efficiencies (η) = 24%, were obtained for (N(C 12 H 25) 2 (CH 3) 2) + [Eu(bmdm) 4 ]-, while (N(C 4 H 9) 4) + [Eu(bmdm) 4 ]has the longest τ = 1.04 ms and η = 90%. The Judd-Ofelt intensity parameters (Ω 2 and Ω 4) strongly changes for tta series pointing to stronger ion-dipole interactions between the-CF 3 group with the ammonium cations. The agreement between the experimental results of photoluminescence and theoretical data suggests that the geometries optimized by the Sparkle model are correct. These results point to potential candidates for building up Langmuir-Blodgett (LB) luminescent films, since it is possible to maximize the intermolecular interactions and the photoluminescent properties of tetrakis Ln III complexes.

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“…This can be seen in the analysis of heteroligand complexes that include such highly donor solvents as DMFA and DMSO. Coordination of such solvents by the lanthanide ion usually destroys the stacking interaction, but in Tb 2 (carb 12 ) 6 (DMFA) 2 (H 2 O) 2 structure, where Hcarb 12 = 4‐iodobenzoic acid, π‐π stacking interaction between the structural fragments of molecules is preserved (Figure ) …”

Section: The Influence Of the Substituent On The Structures Of Lanmentioning

confidence: 99%

On the Structural Features of Substituted Lanthanide Benzoates

et al. 2019

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The effect of 4-halogenobenzoate ligands on luminescent and structural properties of lanthanide complexes: experimental and theoretical approaches

Abstract: Luminescence of lanthanides complexes; Influence of 4-halogenobenzoate ligands, Molecular and crystal structures; Ligand-metal charge transfer; Covalence degree of Eu-Ligands; Energy transfer rates.

Cited by 37 publications

References 40 publications

Luminescence Enhancement by p‐Substituent Variation

Luminescence Enhancement by p‐Substituent Variation

The Influence of Different Ammonium Cations on the Optical Properties of Tetrakis GdIII and EuIII Complexes

On the Structural Features of Substituted Lanthanide Benzoates

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