Experimental and theoretical investigations of the [Ln(β-dik)(NO3)2(phen)2]⋅H2O luminescent complexes

Santos, Paulo Roberto Silva; Pereira, Dariston K. S.; Costa, Israel F.; Silva, Iran F; Brito, Hermi F.; Faustino, Wagner M.; Neto, Albano N. Carneiro; Moura, Renaldo T.; Araújo, Maria Helena; Diniz, Renata; Malta, O.L.; Teotonio, Ercules E.S.

doi:10.1016/j.jlumin.2020.117455

Cited by 17 publications

(6 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These results are a consequence of the lanthanide’s low absorption coefficient and the effective sensitizing character of the organic ligands in the IET process. Besides, the broadband profiles are in agreement with other results reported in the literature for Ln(III)-β-diketonate coordination compounds. ,,, …”

Section: Resultsmentioning

confidence: 96%

“…The BOM describes the ligand polarizability in terms of α OP and α ′ . α OP is, by definition, the chemical bond overlap polarizability, and α ′ represents the ligand effective polarizability, which is related to a specific molecular region that may directly or indirectly affect the chemical environment of the lanthanide. ,, The values of g , α ′ , and α OP were determined using the JOYSpectra web platform . The theoretical calculations were performed by separating ligating atoms into two groups, one belonging to the β-diketone and the other to the phosphine oxide ligand.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Enhancing the Luminescence of Eu(III) Complexes with the Ruthenocene Organometallic Unit as Ancillary Ligand

et al. 2022

Self Cite

View full text Add to dashboard Cite

Five novel Eu(III)-β-diketonate complexes containing ruthenocene ancillary ligands (1,1′-bis(diphenylphosphoryl)-ruthenocene�RcBPO) were synthesized and characterized. The coordination compounds presented the general formula [Eu(βdik) 3 (RcBPO)], where β-dik stands for 2-thenoyltrifluoroacetonate (tta), 3-benzoyl-1,1,1-trifluoroacetone (btf), 2-dibenzoylmethanate (dbm), 2-acetyl-1,3-indandionate (aind), and 2-benzoyl-1,3-indandionate (bind), and RcBPO stands for 1,1′-bis-(diphenylphosphoryl)ruthenocene. The [Eu(aind) 3 (RcBPO)] complex crystallizes in a monoclinic Cc non-centrosymmetric space group with the europium site environment, assuming a bicapped trigonal prism coordination polyhedron with the symmetry point group close to C 2v . Photoluminescent properties for the solid-state samples were described in terms of excitation, emission, lifetime decay curves, and intrinsic and overall quantum yields. The replacement of the two coordinated H 2 O molecules by the RcBPO ancillary ligand leads to great enhancements of the overall quantum yields (Q Eu L ), with the minimum increment by a factor of 5 for the case of [Eu(btf) 3 (RcBPO)] and the maximum enhancement of 270 times for the case of the [Eu(dbm) 3 (RcBPO)] complex. In addition, theoretical calculations were carried out to model the spectroscopic properties of the investigated compounds. To obtain theoretical Judd−Ofelt parameters (Ω λ , λ = 2, 4, and 6) and intramolecular energy transfer rates, the JOYSpectra web platform was employed using the structure obtained from density functional theory calculations. Hence, a rate equation model provided theoretical overall quantum yields, which are in great agreement with measured data.

show abstract

Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Enhancing the Luminescence of Eu(III) Complexes with the Ruthenocene Organometallic Unit as Ancillary Ligand

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…Все комплексы синтезированы по единой методике, адаптированной из литературы [9,15]. Первоначально раствор 3 mmol NaOH в 10 mL деионизированной воды по каплям добавляли к этанольному раствору 3 mmol β-дикетона (Htta или Hbtfa) при постоянном перемешивании при 60…”

Section: синтез комплексовunclassified

“…Среди элементов ряда лантанидов европий играет важную роль в фотонике и оптических применениях как ион Eu 3+ , так и Eu 2+ , каждый из которых имеет собственные спектроскопические характеристики. Благодаря особенностям электронной структуры иона Eu 3+ спектры излучения соединений и материалов, содержащих этот ион, могут быть использованы для определения параметров интенсивности [10,12,15]. В то же время для иона Eu 2+ характерны разрешенные дипольные переходы 4 f −5d; он был применен, например, в материалах, которые демонстрируют явление длительной люминесценции с возможностью перестраивания цвета излучения за счет эффектов сильного поля лиганда [16][17][18].…”

Section: Introductionunclassified

Об экспериментальном определении параметров интенсивности 4f-4f-переходов по спектрам излучения соединений европия (III)

Blois

Neto

Longo

et al. 2022

Оптика И Спектроскопия

Self Cite

View full text Add to dashboard Cite

Eu3+ complexes and specially β-diketonate compounds are well known and studied in several areas due to their luminescence properties, such as sensors and lightning devices. A unique feature of the Eu3+ ion is the experimental determination of the 4f-4f intensity parameters Ωλ directly from the emission spectrum. The equations for determining Ωλ from the emission spectra are different for the detection of emitted power compared to modern equipment that detects photons per second. It is shown that the differences between Ωλ determined by misusing the equations are sizable for Ω4 (ca. 15.5%) for several Eu3+β-diketonate complexes and leads to differences of ca. 5% in the intrinsic quantum yields Q_Ln^Ln. Due to the unique features of trivalent lanthanide ions, such as the shielding of 4f-electrons, which lead to small covalency and crystal field effects, a linear correlation was observed between Ωλ obtained using the emitted power and photon counting equations. We stress that care should be exercised with the type of detection should be taken and provide the correction factors for the intensity parameters. In addition, we suggest that the integrated intensity (proportional to the areas of the emission band) and the centroid (or barycenter) of the transition for obtaining Ωλ should be determined in the properly Jacobian-transformed spectrum in wavenumbers (or energy). Due to the small widths of the emission bands of typical 4f-4f transitions, the areas and centroids of the bands do not depend on the transformation within the experimental uncertainties. These assessments are relevant because they validate previously determined Ωλ without the proper spectral transformation.

show abstract

“…High luminescence [1][2][3][4][5][6], magnetic activity [7][8][9][10][11], and the possibility of using as bioactive materials [12][13] and telecommunication devices [14][15][16] are responsible for the continuing interest in coordination compounds of lanthanides.Highly volatile stable complexes of lanthanides with a mononuclear structure play a significant role as precursors for the gas-phase synthesis of thin-film materials [17][18].…”

Section: Introductionmentioning

confidence: 99%

THE COORDINATION COMPOUNDS Gd (III) AND Dy(III) WITH SOME β-DIKETONES

Berezhnytska¹,

Rohovtsov²,

Horbenko³

et al. 2021

Ukr. Chem. Journ.

View full text Add to dashboard Cite

New complexes of Dy (III) and Gd (III) with b-diketones containing unsaturated and aryl substituents were synthesized. Metal polymers based on synthesized complexes were obtained by the method of radical polymerization. The composition and structure of synthesized complexes and metal polymers are established. It is shown that during polymerization the coordination environment of the central ion remains unchanged. The spectral-luminescent characteristics of the synthesized compounds were studied. The presence of water molecules in the immediate coordination environment causes a low intensity of emission of monomeric dysprosium complexes. In the luminescence spectra of metal polymers, there are bands magnetic dipole transition (4F9 → 6H15/2) and electric dipole transition (4F9 → 6H13/2). The close energies of the triplet level of the ligand and the resonant level of the dysprosium ion cause low emission characteristics of the synthesized dysprosium complexes.

show abstract

Experimental and theoretical investigations of the [Ln(β-dik)(NO3)2(phen)2]⋅H2O luminescent complexes

Cited by 17 publications

References 49 publications

Enhancing the Luminescence of Eu(III) Complexes with the Ruthenocene Organometallic Unit as Ancillary Ligand

Enhancing the Luminescence of Eu(III) Complexes with the Ruthenocene Organometallic Unit as Ancillary Ligand

Об экспериментальном определении параметров интенсивности 4f-4f-переходов по спектрам излучения соединений европия (III)

THE COORDINATION COMPOUNDS Gd (III) AND Dy(III) WITH SOME β-DIKETONES

Contact Info

Product

Resources

About