scholarly journals Diarylphosphate as a New Route for Design of Highly Luminescent Ln Complexes

Molecules ◽  
2020 ◽  
Vol 25 (17) ◽  
pp. 3934
Author(s):  
Alexey E. Kalugin ◽  
Mikhail E. Minyaev ◽  
Lada N. Puntus ◽  
Ilya V. Taydakov ◽  
Evgenia A. Varaksina ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Coordination Sphere ◽  
Near Infrared ◽  
Photophysical Properties ◽  
Transfer Scheme ◽  
Chloride Complexes ◽  
Very High ◽  
Bright Luminescence ◽  
The Eu

Organophosphate-chloride complexes [{(2,6-iPr2C6H3-O)2POO}2LnCl(CH3OH)4]·2CH3OH, Ln = Nd (1), Eu (2), Gd (3), and Tb (4) have been obtained and structurally characterized. Their reaction with 2,2′:6′,2″-terpyridine leads to the formation of 1:1 adducts ([{(2,6-iPr2C6H3-O)2POO}2LnCl(terpy)(H2O)2(CH3OH)], Ln = Eu (5), Gd (6), Tb (7) with exception of Nd, where tris-diisopropylphenylphosphate complex [{(2,6-iPr2C6H3-O)2POO}3Nd) (terpy)(H2O)(CH3OH)] (8) was obtained due to the ligand metathesis. A bright luminescence observed for the Eu and Tb organophosphate complexes is the first example of an application of organophosphate ligands for 4f-ions luminescence sensitization. Photophysical properties of all complexes were analyzed by optical spectroscopy and an energy transfer scheme was discussed. A combination of two types of ligands into the coordination sphere (phosphate and phenanthroline) allows designing the Eu surrounding with very high intrinsic quantum yield QEuEu (0.92) and highly luminescent Ln complexes for both visible and near-infrared (NIR) regions.

Synthesis of Mn2+ Doped CdS Nanocrystals Embedded in a Sol-Gel Silica Matrix: Characterization of the Luminescence Activator

1996 ◽  
Vol 452 ◽  
Author(s):  
G. Counio ◽  
S. Esnouf ◽  
T. Gacoin ◽  
P. Barboux ◽  
A. Hofstaetter ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Sol Gel ◽  
Silica Matrix ◽  
Silica Xerogels ◽  
Cds Nanocrystals ◽  
Bright Luminescence

AbstractMn2+-doped CdS nanocrystals (1.2 to 2.4 nm in diameter) embedded in organic-inorganic silica xerogels have been synthesized. Extensive studies (EXAFS, ESR and ENDOR) allow us to localize the ions responsible for the bright luminescence observed in such materials (quantum yield of 7%). The average number of Mn2+ per nanocrystal is in the 0.2–0.8 range, and the emission arises from an energy transfer from surface trapped carriers to Mn2+ ions.

scholarly journals Photophysical Investigation of near Infrared Emitting Lanthanoid Complexes Incorporating Tris(2-Naphthoyl)methane as a New Antenna Ligand

2019 ◽  
Author(s):  
Laura Abad Galán ◽  
Satoshi Wada ◽  
Lee Cameron ◽  
Alexandre N. Sobolev ◽  
Yasuchika Hasegawa ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Quantitative Data ◽  
Near Infrared ◽  
Photophysical Properties ◽  
Radiative Decays ◽  
Quantum Yields ◽  
Mononuclear Complexes ◽  
Deuterated Analogue ◽  
Antenna Ligand

A conjugated <i>β</i>-triketone, tris(2-naphthoyl)methane (<b>tnm</b>H), has been synthesized and successfully utilized as an antenna moiety for sensitization of the trivalent lanthanoids Eu<sup>3+</sup><sub>,</sub>Sm<sup>3+</sup><sub>,</sub>Yb<sup>3+</sup>and Nd<sup>3+</sup>, in an isomorphous series of mononuclear complexes formulated as [Ln(<b>tnm</b>)<sub>3</sub>(DMSO)<sub>2</sub>] (Ln<sup>3+ </sup>= Nd<sup>3+</sup>, Sm<sup>3+</sup>, Eu<sup>3+</sup>, Gd<sup>3+</sup>and Yb<sup>3+</sup>). The photophysical properties of the materials were characterized as comprehensively as possible, with overall quantum yields, intrinsic quantum yields based on calculated radiative decays, and sensitization efficiencies reported. This investigation improves understanding of the sensitization processes occurring in the near-infrared (NIR) region systems in particular, where quantitative data is currently scarce. In fact, the [Yb(<b>tnm</b>)<sub>3</sub>(DMSO)<sub>2</sub>] and its deuterated analogue, [Yb(<b>tnm</b>)<sub>3</sub>(<i>d<sub>6</sub>-</i>DMSO)<sub>2</sub>], present high values of overall quantum yield of 4% and 6%, respectively, which makes them useful and readily accessible references for future investigation of NIR-emitting systems.

scholarly journals Photophysical Challenges and Antenna Effect Between Click Reaction-based Bodipy Derivatives Manufactured From Knorr Pyrrole

2021 ◽  
Author(s):  
ahmed nuri kursunlu ◽  
Akif Kagan Yilmaz ◽  
Elif Bastug ◽  
Ersin Guler
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Absorption Coefficient ◽  
Organic Solvents ◽  
Click Reaction ◽  
Photophysical Properties ◽  
Molar Absorption Coefficient ◽  
Antenna Effect ◽  
Preliminary Study

Abstract In this paper, a series of click reaction-based Bodipy derivatives have been synthesized as part of a preliminary study. Following the characterization of the four challenger molecules, the photophysical properties (absorption, emission, excitation, molar absorption coefficient, quantum yield, etc.) were examined in various organic solvents. The results showed that the energy transfer from the Bodipy cores to other moieties was calculated between 71% and 93% depending on different π-electron configurations and chromophore groups.

scholarly journals Energy Transfer Between Eu3+ and Nd3+ in Near-Infrared Emitting β-Triketonate Coordination Polymers

2018 ◽  
Author(s):  
Laura Abad Galán ◽  
Alexandre Sobolev ◽  
Brian Skelton ◽  
Eli Zysman-Colman ◽  
Mark Ogden ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Coordination Polymers ◽  
Near Infrared ◽  
Photophysical Properties ◽  
Coordination Complex ◽  
Luminescence Properties ◽  
Quantum Yields ◽  
High Quantum

Isomorphous<i>β</i>-triketonate-based lanthanoid polymers containing tris(4-methylbenzoyl)methanide (<b>mtbm</b>) and Rb<sup>+</sup>with formula,{[Ln(Rb)(<b>mtbm</b>)<sub>4</sub>]<sub>2</sub>}<i><sub>n </sub></i>(Ln = Eu<sup>3+ </sup>and Nd<sup>3+</sup>) have been synthesised and structurally characterised. The photophysical properties for the Nd<sup>3+</sup>complex presented long lifetimes and relatively high quantum yields in comparison with analogous <i><u>β</u></i>-diketonate complexes. Mixed lanthanoid complexes were also formed and their luminescence properties studied, with effective sensitisation of the <sup>4</sup>F<sub>3/2 </sub>of<sub></sub> Nd<sup>3+ </sup>via the <sup>5</sup>D<sub>0 </sub>of Eu<sup>3+</sup>, which is to the best of our knowledge the first example of Eu<sup>3+</sup>to Nd<sup>3+</sup>sensitisation in a coordination complex or polymer.<br>

Quantum yield of singlet dioxygen and elucidation of the quenching mechanism for the reaction between the doublet excited states of tris(bipyridine)chromium(III) and triplet dioxygen

1996 ◽  
Vol 74 (3) ◽  
pp. 336-340 ◽  
Author(s):  
Acharee Tiyabhorn ◽  
K. Omar Zahir
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Excited States ◽  
Near Infrared ◽  
Deuterium Oxide ◽  
Quenching Mechanism ◽  
Intensity Measurements ◽  
Infrared Luminescence ◽  
A Value ◽  
A Minor

The formation of singlet dioxygen (1O2) in the reaction between the doublet excited states of tris(bipyridine)chromium(III) and triplet dioxygen in deuterium oxide was detected using near-infrared luminescence corresponding to singlet dioxygen decay. In addition, luminescence intensity measurements were used to determine the quantum yield of singlet dioxygen produced. A value of 0.86 ± 0.08 was obtained for the yield of 1O2. Based on these quantum yield measurements, it is proposed that the major quenching mode is energy transfer quenching. However, considering that the 1O2 yield is less than unity and electron transfer quenching is not a viable pathway, it is proposed that, in addition to the energy transfer quenching, physical quenching involving spin-catalyzed deactivation of Cr(bpy)33+ may also be operative as a minor quenching pathway. Key words: Cr(bpy)33+, singlet dioxygen, quenching, quantum yield.

Synthesis, electrochemistry, spectroscopy and photophysical properties of a series of meso-phenylpyridylporphyrins with one to four pyridyl rings coordinated to [Ru(bipy)2Cl]+ groups

2002 ◽  
Vol 06 (01) ◽  
pp. 33-42 ◽  
Author(s):  
Fábio M. Engelmann ◽  
Pellegrino Losco ◽  
Herbert Winnischofer ◽  
Koiti Araki ◽  
Henrique E. Toma
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Electrochemical Behavior ◽  
Fluorescence Quantum Yield ◽  
Photophysical Properties ◽  
Intramolecular Energy Transfer ◽  
Porphyrin Ring ◽  
Transfer Processes ◽  
Redox Pair ◽  
Mlct State

A series of meso-phenylpyridylporphyrins and their respective supermolecular species obtained by the coordination of [ Ru ( bipy )2 Cl ]+ groups to the pyridyl substituents was synthesized and characterized. Their spectroscopic and electrochemical behavior were similar to that observed for the meso-tetra(4-pyridyl)porphyrin derivative, but the redox potential of the Ru (III/II) redox pair was about 70 mV more negative. The porphyrin centered fluorescence quantum yield exhibited a linear decrease as a function of the number of pyridyl substituents on the porphyrin ring. Efficient intramolecular energy transfer processes from the 3 MLCT state of the ruthenium complexes to the porphyrin center were observed at 77K in ethanol glass.

scholarly journals Energy Transfer Between Eu3+ and Nd3+ in Near-Infrared Emitting β-Triketonate Coordination Polymers

2018 ◽  
Author(s):  
Laura Abad Galán ◽  
Alexandre Sobolev ◽  
Brian Skelton ◽  
Eli Zysman-Colman ◽  
Mark Ogden ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Coordination Polymers ◽  
Near Infrared ◽  
Photophysical Properties ◽  
Coordination Complex ◽  
Luminescence Properties ◽  
Quantum Yields ◽  
High Quantum

Isomorphous<i>β</i>-triketonate-based lanthanoid polymers containing tris(4-methylbenzoyl)methanide (<b>mtbm</b>) and Rb<sup>+</sup>with formula,{[Ln(Rb)(<b>mtbm</b>)<sub>4</sub>]<sub>2</sub>}<i><sub>n </sub></i>(Ln = Eu<sup>3+ </sup>and Nd<sup>3+</sup>) have been synthesised and structurally characterised. The photophysical properties for the Nd<sup>3+</sup>complex presented long lifetimes and relatively high quantum yields in comparison with analogous <i><u>β</u></i>-diketonate complexes. Mixed lanthanoid complexes were also formed and their luminescence properties studied, with effective sensitisation of the <sup>4</sup>F<sub>3/2 </sub>of<sub></sub> Nd<sup>3+ </sup>via the <sup>5</sup>D<sub>0 </sub>of Eu<sup>3+</sup>, which is to the best of our knowledge the first example of Eu<sup>3+</sup>to Nd<sup>3+</sup>sensitisation in a coordination complex or polymer.<br>

FRET-enhanced photoluminescence of perylene diimides by combining molecular aggregation and insulation

2020 ◽  
Vol 8 (26) ◽  
pp. 8953-8961 ◽  
Author(s):  
Bolong Zhang ◽  
Igor Lyskov ◽  
Lachlan J. Wilson ◽  
Randy P. Sabatini ◽  
Anjay Manian ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Molecular Aggregation ◽  
High Concentration ◽  
Efficient Energy Transfer ◽  
Perylene Diimides ◽  
Efficient Energy ◽  
Enhanced Photoluminescence ◽  
Photoluminescence Quantum Yield ◽  
Very High

Samples containing both molecularly insulated and aggregated perylene diimides at high concentration (140 mM) in polymer matrix showed very high photoluminescence quantum yield (85%) as a result of efficient energy transfer.

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