Quantum yield of luminescence from europium and terbium ions in complex compounds containing different ligands

1976 ◽  
Vol 24 (2) ◽  
pp. 189-192
Author(s):  
N. S. Polu�ktov ◽  
I. I. Zheltvai ◽  
G. I. Gerasimenko ◽  
M. A. Tishchenko ◽  
A. A. Kucher
Keyword(s):  
Quantum Yield ◽  
Complex Compounds ◽  
Quantum Yield Of Luminescence

Concentration dependence of the quantum yield of luminescence of Tm3+ ions in gadolinium oxychloride

2004 ◽  
Vol 71 (6) ◽  
pp. 829-836
Author(s):  
T. M. Kozhan ◽  
V. V. Kuznetsova ◽  
P. P. Pershukevich ◽  
I. I. Sergeev ◽  
V. S. Khomenko ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Concentration Dependence ◽  
Quantum Yield Of Luminescence

scholarly journals Quantitative express estimation of humine and fulvo acids content in aqueous solutions by photo-stimulated luminescence

2018 ◽  
Keyword(s):  
Quantum Yield ◽  
Dynamic Range ◽  
Light Flux ◽  
Low Noise ◽  
Light Sources ◽  
Colloidal Systems ◽  
Colloidal Solutions ◽  
Measuring Device ◽  
Light Emitting ◽  
Quantum Yield Of Luminescence

The work substantiates the expediency of using the methods of recording the quantum yield of luminescence of humic and folic compounds in the process of determining the relative concentrations of these substances in aqueous and colloidal solutions. The efficiency of using modern high-power ultraviolet semiconductor light sources with high monochromaticity of light flux has been proved, followed by the registration of reviews of the samples under investigation with the help of a low-noise semiconductor photodetector with a connected operational amplifier, which allows to provide a wide dynamic range of current and voltage measurements. The subject of the study is the process of recording the quantitative and qualitative parameters of the se- lected chemical compounds in colloidal systems in the liquid phase developed in the course of research by the model of the measuring instrument. The novelty of the work is to improve the classical methods for recording the quantum yield of lumines- cence, using a modern element base and testing the model of a measuring device with powerful ultraviolet light-emitting diodes as a light source and low-noise photodetector with a clear dynamic range designed for recording the quantum yield of luminescence of the samples under investigation.

Quantum yield of luminescence of Ag nanoclusters dispersed within transparent bulk glass vs. glass composition and temperature

2012 ◽  
Vol 101 (25) ◽  
pp. 251106 ◽  
Author(s):  
A. S. Kuznetsov ◽  
J. J. Velázquez ◽  
V. K. Tikhomirov ◽  
J. Mendez-Ramos ◽  
V. V. Moshchalkov
Keyword(s):  
Quantum Yield ◽  
Glass Composition ◽  
Bulk Glass ◽  
Quantum Yield Of Luminescence ◽  
Ag Nanoclusters

scholarly journals Влияние полимерной матрицы на люминесцентные свойства композиций, допированных хелатами бора

2019 ◽  
Vol 127 (9) ◽  
pp. 425
Author(s):  
Е.В. Федоренко ◽  
А.А. Хребтов ◽  
А.Г. Мирочник ◽  
П.С. Нефедов ◽  
Л.А. Лим ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Polymethyl Methacrylate ◽  
Maximum Quantum Yield ◽  
Quantum Yield Of Luminescence ◽  
Phenyl Rings ◽  
Boron Difluoride

Polymer luminescent compositions based on polystyrene (PS), polycarbonate (PC) and polymethyl methacrylate (PMMA) doped with boron difluoride dibenzoylmethanate (DBMBF2), boron difluoride anthracenoylacetonate (AntAcBF2) and their mixture were investigated. Composition based on PS has a maximum quantum yield of luminescence. The role of PS in increasing the efficiency of energy transfer from the donor (DBMBF2) to the acceptor (AntAcBF2) is revealed, which is due to the formation of exciplexes between DBMBF2 and phenyl rings of PS.

scholarly journals A Comprehensive Strategy to Boost the Quantum Yield of Luminescence of Europium Complexes

2013 ◽  
Vol 3 (1) ◽  
Author(s):  
Nathalia B. D. Lima ◽  
Simone M. C. Gonçalves ◽  
Severino A. Júnior ◽  
Alfredo M. Simas
Keyword(s):  
Quantum Yield ◽  
Europium Complexes ◽  
Comprehensive Strategy ◽  
Quantum Yield Of Luminescence

scholarly journals Photophysical study and in vitro approach against Leishmania panamensis of dicloro-5,10,15,20-tetrakis(4-bromophenyl)porphyrinato Sn(IV)

F1000Research ◽  
2021 ◽  
Vol 10 ◽  
pp. 379
Author(s):  
Fabián Espitia-Almeida ◽  
Carlos Diaz-Uribe ◽  
William Vallejo ◽  
Doris Gómez-Camargo ◽  
Arnold R. Romero Bohórquez ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Singlet Oxygen ◽  
Complex Compounds ◽  
Visible Range ◽  
Electromagnetic Spectrum ◽  
Metal Free ◽  
Porphyrin Complex ◽  
Ft Ir ◽  
Metal Insertion

Background: Photodynamic therapy activity against different biological systems has been reported for porphyrins. Porphyrin modifications through peripheral groups and/or by metal insertion inside the ring are main alternatives for the improvement of its photo-physical properties. In this study, we synthesized and characterized 5,10,15,20-tetrakis(4-bromophenyl)porphyrin and the dicloro-5,10,15,20-tetrakis(4-bromophenyl)porphyrinato Sn(IV). Methods: Metal-free porphyrin was synthesized using the Alder method, while the Sn(IV)-porphyrin complex was prepared by combining metal-free porphyrin with stannous chloride in DMF; the reaction yields were 47% and 64% respectively. Metal-free porphyrin was characterized by UV-Vis, FT-IR, ESI-mass spectrometry and 13C-NMR. Additionally, the Sn(IV) -porphyrin complex was characterized using UV-Vis and FT-IR. Cyclic voltammetry tests in four different solvents. The fluorescence quantum yield (Φf) was measured using fluorescein as a standard, the singlet oxygen quantum yield (ΦD) was estimated using the standard 5,10,15,20-(tetraphenyl)porphyrin (H2TPP) and the quencher of singlet oxygen 1,3-diphenylisobenzofuran (DPBF). Results: UV-Vis assay showed typical Q and Soret bands for porphyrin and its metallo-porphyrin complex. Compounds showed photoluminescence at the visible range of electromagnetic spectrum. The inclusion of the metal in the porphyrin core changed the Φf from 0.15 to 0.05 and the ΦD increased from 0.55 to 0.59. Finally, the effect of the compounds on the viability of L. panamensis was evaluated by means of the MTT test. The results showed that both compounds decreased the viability of the parasite; this inhibitory activity was greater under light irradiation; the porphyrin compound had IC50 of 16.5 μM and the Sn(IV)-porphyrin complex had IC50 of 19.2 μM. Conclusion: The compounds were synthesized efficiently, their characterization was carried out by different spectroscopy techniques and their own signals were evidenced for both structures, both compounds decreased the cell viability of L. panamensis.

scholarly journals Photophysical study and in vitro approach against Leishmania panamensis of dicloro-5,10,15,20-tetrakis(4-bromophenyl)porphyrinato Sn(IV)

F1000Research ◽  
2021 ◽  
Vol 10 ◽  
pp. 379
Author(s):  
Fabián Espitia-Almeida ◽  
Carlos Diaz-Uribe ◽  
William Vallejo ◽  
Doris Gómez-Camargo ◽  
Arnold R. Romero Bohórquez ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Singlet Oxygen ◽  
Complex Compounds ◽  
Visible Range ◽  
Electromagnetic Spectrum ◽  
Metal Free ◽  
Porphyrin Complex ◽  
Ft Ir ◽  
Metal Insertion

Background: Photodynamic therapy activity against different biological systems has been reported for porphyrins. Porphyrin modifications through peripheral groups and/or by metal insertion inside the ring are main alternatives for the improvement of its photo-physical properties. In this study, we synthesized and characterized 5,10,15,20-tetrakis(4-bromophenyl)porphyrin and the dicloro-5,10,15,20-tetrakis(4-bromophenyl)porphyrinato Sn(IV). Methods: Metal-free porphyrin was synthesized using the Alder method, while the Sn(IV)-porphyrin complex was prepared by combining metal-free porphyrin with stannous chloride in DMF; the reaction yields were 47% and 64% respectively. Metal-free porphyrin was characterized by UV-Vis, FT-IR, ESI-mass spectrometry and 13C-NMR. Additionally, the Sn(IV) -porphyrin complex was characterized using UV-Vis and FT-IR. Cyclic voltammetry tests in four different solvents. The fluorescence quantum yield (Φf) was measured using fluorescein as a standard, the singlet oxygen quantum yield (ΦD) was estimated using the standard 5,10,15,20-(tetraphenyl)porphyrin (H2TPP) and the quencher of singlet oxygen 1,3-diphenylisobenzofuran (DPBF). Results: UV-Vis assay showed typical Q and Soret bands for porphyrin and its metallo-porphyrin complex. Compounds showed photoluminescence at the visible range of electromagnetic spectrum. The inclusion of the metal in the porphyrin core changed the Φf from 0.15 to 0.05 and the ΦD increased from 0.55 to 0.59. Finally, the effect of the compounds on the viability of L. panamensis was evaluated by means of the MTT test. The results showed that both compounds decreased the viability of the parasite; this inhibitory activity was greater under light irradiation; the porphyrin compound had IC50 of 16.5 μM and the Sn(IV)-porphyrin complex had IC50 of 19.2 μM. Conclusion: The compounds were synthesized efficiently, their characterization was carried out by different spectroscopy techniques and their own signals were evidenced for both structures, both compounds decreased the cell viability of L. panamensis.

scholarly journals Photophysical study and in vitro approach against Leishmania panamensis of dicloro-5,10,15,20-tetrakis(4-bromophenyl)porphyrinato Sn(IV)

F1000Research ◽  
2021 ◽  
Vol 10 ◽  
pp. 379
Author(s):  
Fabián Espitia-Almeida ◽  
Carlos Diaz-Uribe ◽  
William Vallejo ◽  
Doris Gómez-Camargo ◽  
Arnold R. Romero Bohórquez ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Singlet Oxygen ◽  
Complex Compounds ◽  
Visible Range ◽  
Electromagnetic Spectrum ◽  
Metal Free ◽  
Porphyrin Complex ◽  
Ft Ir ◽  
Metal Insertion

Background: Photodynamic therapy activity against different biological systems has been reported for porphyrins. Porphyrin modifications through peripheral groups and/or by metal insertion inside the ring are main alternatives for the improvement of its photo-physical properties. In this study, we synthesized and characterized 5,10,15,20-tetrakis(4-bromophenyl)porphyrin and the dicloro-5,10,15,20-tetrakis(4-bromophenyl)porphyrinato Sn(IV). Methods: Metal-free porphyrin was synthesized using the Alder method, while the Sn(IV)-porphyrin complex was prepared by combining metal-free porphyrin with stannous chloride in DMF; the reaction yields were 47% and 64% respectively. Metal-free porphyrin was characterized by UV-Vis, FT-IR, ESI-mass spectrometry and 13C-NMR. Additionally, the Sn(IV) -porphyrin complex was characterized using UV-Vis and FT-IR. Cyclic voltammetry tests in four different solvents. The fluorescence quantum yield (Φf) was measured using fluorescein as a standard, the singlet oxygen quantum yield (ΦD) was estimated using the standard 5,10,15,20-(tetraphenyl)porphyrin (H2TPP) and the quencher of singlet oxygen 1,3-diphenylisobenzofuran (DPBF). Results: UV-Vis assay showed typical Q and Soret bands for porphyrin and its metallo-porphyrin complex. Compounds showed photoluminescence at the visible range of electromagnetic spectrum. The inclusion of the metal in the porphyrin core changed the Φf from 0.15 to 0.05 and the ΦD increased from 0.55 to 0.59. Finally, the effect of the compounds on the viability of L. panamensis was evaluated by means of the MTT test. The results showed that both compounds decreased the viability of the parasite; this inhibitory activity was greater under light irradiation; the porphyrin compound had IC50 of 16.5 μM and the Sn(IV)-porphyrin complex had IC50 of 19.2 μM. Conclusion: The compounds were synthesized efficiently, their characterization was carried out by different spectroscopy techniques and their own signals were evidenced for both structures, both compounds decreased the cell viability of L. panamensis.

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