scholarly journals Photophysical investigation of near infrared emitting lanthanoid complexes incorporating tris(2-naphthoyl)methane as a new antenna ligand

2019 ◽  
Vol 48 (11) ◽  
pp. 3768-3776 ◽  
Author(s):  
Laura Abad Galán ◽  
Satoshi Wada ◽  
Lee Cameron ◽  
Alexandre N. Sobolev ◽  
Yasuchika Hasegawa ◽  
...  
Keyword(s):  
Significant Role ◽  
Near Infrared ◽  
Photophysical Properties ◽  
Ancillary Ligands ◽  
Antenna Ligand

Study of a series of lanthanoid complexes reveals that ancillary ligands play a significant role in their photophysical properties.

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 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.

Two-Dimensional Near-Infrared and Shortwave Infrared Molecular Aggregates: Taking Kasha’s Model to the Next Dimension

2019 ◽  
Author(s):  
Arundhati Deshmukh ◽  
Danielle Koppel ◽  
Chern Chuang ◽  
Danielle Cadena ◽  
Jianshu Cao ◽  
...  
Keyword(s):  
Near Infrared ◽  
Photophysical Properties ◽  
Satellite Telemetry ◽  
Transition Dipole Moment ◽  
Short Wave ◽  
Tissue Imaging ◽  
Transition Dipole ◽  
Deep Tissue Imaging ◽  
Excitonic States ◽  
Shortwave Infrared

Technologies which utilize near-infrared (700 – 1000 nm) and short-wave infrared (1000 – 2000 nm) electromagnetic radiation have applications in deep-tissue imaging, telecommunications and satellite telemetry due to low scattering and decreased background signal in this spectral region. However, there are few molecular species, which absorb efficiently beyond 1000 nm. Transition dipole moment coupling (e.g. J-aggregation) allows for redshifted excitonic states and provides a pathway to highly absorptive electronic states in the infrared. We present aggregates of two cyanine dyes whose absorption peaks redshift dramatically upon aggregation in water from ~ 800 nm to 1000 nm and 1050 nm with sheet-like morphologies and high molar absorptivities (e ~ 10<sup>5 </sup>M<sup>-1</sup>cm<sup>-1</sup>). To describe this phenomenology, we extend Kasha’s model for J- and H-aggregation to describe the excitonic states of <i> 2-dimensional aggregates</i> whose slip is controlled by steric hindrance in the assembled structure. A consequence of the increased dimensionality is the phenomenon of an <i>intermediate </i>“I-aggregate”, one which redshifts yet displays spectral signatures of band-edge dark states akin to an H-aggregate. We distinguish between H-, I- and J-aggregates by showing the relative position of the bright (absorptive) state within the density of states using temperature dependent spectroscopy. Our results can be used to better design chromophores with predictable and tunable aggregation with new photophysical properties.

scholarly journals New Approach in the Application of Conjugated Polymers: The Light-Activated Source of Versatile Singlet Oxygen Molecule

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1098
Author(s):  
Agata Blacha-Grzechnik
Keyword(s):  
Conjugated Polymers ◽  
Singlet Oxygen ◽  
Near Infrared ◽  
Photophysical Properties ◽  
Short Review ◽  
The Novel ◽  
New Approach ◽  
Intermolecular Energy ◽  
Intermolecular Energy Transfer ◽  
High Absorption

For many years, the research on conjugated polymers (CPs) has been mainly focused on their application in organic electronics. Recent works, however, show that due to the unique optical and photophysical properties of CPs, such as high absorption in UV–Vis or even near-infrared (NIR) region and efficient intra-/intermolecular energy transfer, which can be relatively easily optimized, CPs can be considered as an effective light-activated source of versatile and highly reactive singlet oxygen for medical or catalytic use. The aim of this short review is to present the novel possibilities that lie dormant in those exceptional polymers with the extended system of π-conjugated bonds.

Synthesis of NIR-emitting O-chelated BODIPYs fused with benzene and acenaphthylene

2014 ◽  
Vol 18 (08n09) ◽  
pp. 752-761 ◽  
Author(s):  
Tetsuo Okujima ◽  
Yoichi Shida ◽  
Keishi Ohara ◽  
Yuya Tomimori ◽  
Motoyoshi Nishioka ◽  
...  
Keyword(s):  
Near Infrared ◽  
Photophysical Properties ◽  
Fluorescence Emission ◽  
Fluorescence Measurement ◽  
Aromatic Rings ◽  
Nir Absorption ◽  
Intense Absorption ◽  
Near Infrared Dye

A series of O-chelated BODIPYs fused with aromatic rings such as benzene and acenaphthylene at β,β-positions was synthesized as a near-infrared dye. The photophysical properties were examined by UV-vis-NIR absorption and fluorescence measurement. Acenaphthylene-fused O-BODIPYs showed a intense absorption at 750–840 nm with the ε of 105 M-1.cm-1. and a fluorescence emission at 770–850 nm with the high Φ value of 0.06–0.43.

Cationic Iridium Dendrimers: Synthesis and Photophysical Properties

2011 ◽  
Vol 64 (9) ◽  
pp. 1211 ◽  
Author(s):  
Bin Du ◽  
Si-Chun Yuan ◽  
Jian Pei
Keyword(s):  
Solid State ◽  
Photophysical Properties ◽  
Dendritic Structure ◽  
Benzimidazole Derivatives ◽  
Iridium Complex ◽  
Iridium Complexes ◽  
Efficient Energy Transfer ◽  
Ancillary Ligands ◽  
Synthetic Strategy ◽  
Yellow Orange

Two dendrimers, D1 and D2, containing the cationic iridium complexes (C1 and C2) as cores and truxene-functionalized chromophores as the branches, have been developed by a convergent synthetic strategy. The cationic complexes employ 3-(pyridin-2-yl)-1H-1,2,4-triazole and 2-(pyridin-2-yl)-benzimidazole derivatives as the ancillary ligands. To avoid the change in emission colour arising from the iridium complex, the conjugation between the dendron and the ligand is decoupled by separating them using the alkyl chain. An investigation of their photoluminescent features reveals that efficient energy transfer happens from the dendrons to the core in the solid state. Likewise, the charged dendritic structure is demonstrated to be an efficient method to improve the compatibility between the polar charged iridium complexes and typical hydrophobic hosts with the additional benefit of excellent solution processability. Both dendrimers exhibit strong solvatochromic behaviours in solvents and exclusive green and yellow-orange light in the solid state.

scholarly journals Unsymmetrical Heptamethine Dyes for NIR Dye-Sensitized Solar Cells

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Thomas Geiger ◽  
Iuliia Schoger ◽  
Daniel Rentsch ◽  
Anna Christina Véron ◽  
Frédéric Oswald ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Solar Cells ◽  
Solar Cell ◽  
Near Infrared ◽  
Photophysical Properties ◽  
Dye Sensitized Solar Cells ◽  
Dye Sensitized ◽  
Sensitized Solar Cells ◽  
Nir Dye ◽  
Proof Of Principle

Seven unsymmetrical heptamethine dyes with carboxylic acid functionality were synthesized and characterized. These near-infrared dyes exhibit outstanding photophysical properties depending on their heterocyclic moieties and molecular structure. As proof of principle, the dyes were used as photosensitizers in dye-sensitized solar cells. Using the most promising dye, an overall conversion efficiency of 1.22% and an almost colorless solar cell were achieved.

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