Luminescent properties of europium and terbium complexes with 2′-hydroxy-4′,6′-dimethoxyacetophenone

Taxak, V.B.; Kumar, Rajesh; Makrandi, J. K.; Khatkar, S.P.

doi:10.1016/j.displa.2010.02.007

Cited by 22 publications

(10 citation statements)

References 22 publications

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“…From the perspective of ligands, the introduction of electron-donating ancillary ligands such as 2,2′-bipyridyl (bipy), 1,10-phenanthroline (phen), bathophenanthroline (batho), 5,6-Dimethyl-1,10-phenanthroline (dmph) and neocuproine (neo) having a synergic effect with prime organic ligand and a significant increase in luminescence was observed [10,11]. Among all lanthanides, terbium (III) ion exhibits peculiar luminescence in the bright green region (548), which makes it a propitious contender for green-light emitter in display devices [12].…”

Section: Introductionmentioning

confidence: 99%

Augmentation of photophysical features and Judd–Ofelt analysis of extensively green glowing terbium (III) complexes with nitrogen donor ancillary ligands

Hooda

Taxak

Malik

et al. 2022

Photochem Photobiol Sci

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Six green glowing terbium (III) complexes were fabricated via grinding method utilizing a prime organic ligand (L) and nitrogen donor ancillary ligands. Characterization of synthesized complexes was accomplished through various spectroscopic techniques. The significant thermal stability was determined by thermogravimetric analysis while the energy bandgap and Urbach energy were investigated through diffused reflectance spectra of these complexes. The peak observed at 548 nm in emission spectra is responsible for the virescent color of these complexes. Color purity, decay time, quantum yield, and emission intensities of ternary complexes were significantly improved as compared to binary ones due to the synergistic effect of ancillary ligands. Judd-Ofelt parameters were determined by the NIR absorption spectrum, which claims the asymmetric environment around the terbium (III) ion. CCT values advocate the applicability of these complexes in green light-emitting materials as a cool light source. The biological assignments reveal the significance of these complexes as potent antioxidants and antimicrobial agents. The energy transfer process highlights the enhancement of luminescence in these complexes via the synergic effect of ligands. Our investigation portrays that these complexes can be employed in laser technology, display devices, semiconductors, biological fields, and optoelectronic devices.

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Section: Introductionmentioning

confidence: 99%

Augmentation of photophysical features and Judd–Ofelt analysis of extensively green glowing terbium (III) complexes with nitrogen donor ancillary ligands

Hooda

Taxak

Malik

et al. 2022

Photochem Photobiol Sci

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“…To enhance the luminescence intensity, the solvent molecules were substituted by adding sensitizing ligands containing nitrogen heteroatom (ancillary ligand) via synergic effect. [6] β-Diketone and β-ketocarboxylic acid are main organic ligands, which effectively sensitize the luminescence of lanthanides. However, lanthanide complexes with β-ketocarboxylic acid have become a hot field for researchers who make stable luminescent complexes with lanthanides through β-ketone and hydroxyl groups of carboxylic acid.…”

Section: Introductionmentioning

confidence: 99%

Designing of emerald terbium (III) ions with β‐ketocarboxylic acid and heterocyclic ancillary ligands for biological and optoelectronic applications

et al. 2021

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A green and highly efficient grinding method was adopted to synthesize emerald terbium complexes with 1-cyclopropyl-6-fluro-4-oxo-7-piperazin-1-ylquinoline-3-carboxylic acid as the main organic ligand and 2,2 0 -bipyridyl, 1,10-phenanthroline, neocuproine, 5,6-dimethyl-1,10-phenanthroline and bathophenanthroline as ancillary ligands. Structural analysis of these complexes was executed via elemental, infrared and 1 H-nuclear magnetic resonance analysis, which confirmed that the ligand coordinated to the metal ion through β-ketone and hydroxyl groups of carboxylic acid.Thermal stability of these complexes was investigated by study of thermogravimetric/derivative thermogravimetric analysis. Photoluminescence properties were investigated by observing emission spectra (400-700 nm), excitation spectra (250-500 nm) and decay time curves for display devices. The emission spectra revealed that an intense peak at 545 nm was observed due to 5 D 4 ! 7 F 5 electronic transition, which is responsible for the emerald colour in synthesized complexes, under 353 nm ultraviolet light excitation. The energy band gap and refractive index were determined, which proclaimed the dormant applications of these complexes in semiconductors. Commission Internationale de l'éclairage colour coordinates confirmed that the emerald emission of these complexes lies in the green region. Furthermore, antioxidant, antimicrobial and antimalarial assays of these complexes were also investigated, which confirmed that these complexes are potent for antioxidant, antimicrobial and antimalarial activities.

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“…Hence this is found to be the most suitable ligand for the sensitization process. It was further noticed that the fluorescence intensity of the ternary complexes 1-3 were very strong as compared to the fluorescence in the earlier reported binary Tb 3+ complex with HDAP [25]. It is assumed that the ancillary ligand in the ternary complexes enhance the fluorescence greatly, probably due to the coordination effect between the ligand and ancillary ligands which is beneficial for efficient intramolecular energy transfer from ligand to Tb 3+ ion.…”

Section: Photoluminescence Propertiesmentioning

confidence: 89%

“…1. The IR spectrum of the free ligand shows band at 3430 cm À1 assigned to the enolic O-H stretching vibration [25] which disappeared in the IR spectra of the complexes, implying that the ligand is chelated with Tb(III) ion in a mode of deprotonated enolic OH group. The strong absorption band at 1630 cm À1 was attributed to C@O stretching vibration in the free ligand which shifted to red by 12-15 cm À1 in complexes (1)(2)(3) indicating that the keto group of the ligand was coordinated with the Tb(III) ion.…”

Section: H Nmr and Ir Spectra And Thermal Stabilitymentioning

confidence: 95%

“…Following the reduction, its deep violet colour in methanol bleaches to yellow, shows a significant absorption decrease at 517 nm. Fifty millilitres of various concentrations (25,50, 75, and 100) lg/ml of the complexes dissolved in methanol was added to 5 ml of a 0.004% methanol solution of DPPH. After 30 min incubation period at room temperature, the absorbance was read against a blank at 517 nm.…”

Section: In Vitro Antioxidant Activitymentioning

confidence: 99%

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Synthesis, photoluminescence and biological properties of terbium(III) complexes with hydroxyketone and nitrogen containing heterocyclic ligands

Poonam

Kumar

Boora

et al. 2016

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Luminescent properties of europium and terbium complexes with 2′-hydroxy-4′,6′-dimethoxyacetophenone

Cited by 22 publications

References 22 publications

Augmentation of photophysical features and Judd–Ofelt analysis of extensively green glowing terbium (III) complexes with nitrogen donor ancillary ligands

Augmentation of photophysical features and Judd–Ofelt analysis of extensively green glowing terbium (III) complexes with nitrogen donor ancillary ligands

Designing of emerald terbium (III) ions with β‐ketocarboxylic acid and heterocyclic ancillary ligands for biological and optoelectronic applications

Synthesis, photoluminescence and biological properties of terbium(III) complexes with hydroxyketone and nitrogen containing heterocyclic ligands

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