Solvent-Dependent Sensitization of Ytterbium and Neodymium via an Intramolecular Excimer

Deng, Min; Schley, Nathan D.; Ung, Gaël

doi:10.1021/acs.inorgchem.8b02709

Cited by 15 publications

(6 citation statements)

References 49 publications

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“…Excitation at 355 nm. Similar results are obtained for Ln=Yb [35] . Adapted with permission from Ref.…”

Section: Switching Induced By a Change In The Physical Properties Of The Mediumsupporting

confidence: 81%

“…The solvent polarity and viscosity can also affect in a drastic way the antenna ligand photophysical behavior by mechanisms such as excimer formation, [35] charge transfer state stabilization [36] or excited‐state intramolecular proton transfer (ESIPT) [37] . Therefore, solvent dependent emission was characterized for several NIR emitting lanthanide complexes.…”

Section: Switching Induced By a Change In The Physical Properties Of The Mediummentioning

confidence: 99%

“…Pyrene tendency to change from a purely monomeric fluorescence to a less structured and red‐shifted excited dimer (or excimer) emission was used to tune NIR lanthanide emission by Ung et al [35] . The less structured emission, assigned to the excimer formation is obtained upon concentration or solvent polarity increases.…”

Section: Switching Induced By a Change In The Physical Properties Of The Mediummentioning

confidence: 99%

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Remote Control of Near Infrared Emission with Lanthanide Complexes

et al. 2021

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Molecular luminescent switches form a unique and fascinating class of compounds whose luminescence response can be toggled with chemical or physical stimuli. Switchable near‐infrared (NIR) emitters are of major interest since they are compatible with in vivo imaging and have potential for advanced materials such as security tags. Of particular interest are the NIR emitting lanthanides, which feature narrow, sharp and intense emission lines originating from the f–f Laporte forbidden transitions. Although, these “fingerprints” are in general rather insensitive to surrounding media, they can be manipulated thanks to a proper engineering of the complex first or second coordination spheres. The resulting switching systems may thus find usefulness in various application fields. In this review, we selected representative examples of switchable lanthanide NIR emitters based on the most relevant stimuli, such as chemical, environmental, thermal, electrochemical and photochemical inputs.

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“…Excitation at 355 nm. Similar results are obtained for Ln=Yb [35] . Adapted with permission from Ref.…”

Section: Switching Induced By a Change In The Physical Properties Of The Mediumsupporting

confidence: 81%

Section: Switching Induced By a Change In The Physical Properties Of The Mediummentioning

confidence: 99%

Section: Switching Induced By a Change In The Physical Properties Of The Mediummentioning

confidence: 99%

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Remote Control of Near Infrared Emission with Lanthanide Complexes

et al. 2021

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“…Tris(1-pyrenyl)phosphine has been described and fully characterized, , but bis(1-pyrenyl)phosphines have been very rarely reported. Ung and co-workers recently described the synthesis of ethylbis(1-pyrenyl)phosphinite, but the sole example of a bis(1-pyrenyl)phosphine is phenylbis(1-pyrenyl)phosphine ( 6 ), which was prepared for comparison purposes without experimental details or as a synthetic intermediate, without being isolated. Therefore, it was deemed interesting to report the detailed synthesis and characterization of this compound (Scheme ).…”

Section: Resultsmentioning

confidence: 99%

Expanding the Range of Pyrenylphosphines and Their Derived Ru(II)-Arene Complexes

et al. 2020

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The precursor PPyrCl 2 (Pyr = 1-pyrenyl) has been used to prepare a number of novel 1-pyrenylphosphines. Treatment of PPyrCl 2 with methylmagnesium chloride has provided the phosphine PPyrMe2, with methanol/triethylamine, the phosphonite PPyr(OMe)2 (1), with dimethylamine/triethylamine, the diaminophosphine PPyr(NMe2)2 (2), and with lithium aluminum hydride, PPyrH2 (3). From this primary phosphine, phosphirane PPyr(CH2CH2) (5) has been obtained. The phosphine PPyr2Ph (6) has been synthesized from 1-bromopyrene, while 1-bromo-2-(1-pyrenyl)benzene has been used to prepare Ph-PyrPhos (7) and i-Pr-PyrPhos (8). The new phosphines have subsequently been used to obtain the corresponding [RuCl2(η6-arene)(PPyrR2)] complexes C1 Cym –C3 Cym and C6 Cym –C8 Cym (arene = p-cymene; Cym) and C1 Mba –C3 Mba and C6 Mba –C8 Mba (arene = methyl benzoate; Mba), which have been fully characterized; the crystal structures of C1 Cym , C1 Mba , C2 Cym , C2 Mba , C6 Mba , and C7 Cym were determined by X-ray diffraction. Substitution of the methyl benzoate fragment of complexes C7 Mba and C8 Mba by the η6-coordinated pyrenyl group of the coordinated phosphine was achieved photochemically, giving the tethered complexes C7 Tet and C8 Tet . In these two complexes the phosphine acts as a κ1,η6-coordinated ligand, as evidenced by the X-ray structure of C8 Tet . The antineoplastic activities of the piano-stool Ru compounds revealed that they are highly phosphine dependent and two compounds, namely C1 Cym and C2 Cym , exhibit interesting biological properties.

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“…Despite the fact that the phenomenon of excimer formation was discovered long ago, the study of new fluorescent dyes capable to form excimers in the excited state has been of great interest to researchers until now. Thus, excimer-based fluorescent probes can be used as selective fluorescent sensors for the detection of metal ions, − as fluorescent probes for the detection of DNA, amino acids, enzymes, and ribonucleases, and bioimaging of living cells, bacteria, etc …”

Section: Introductionmentioning

confidence: 99%

Tetrachromophoric Derivatives of Dibenzoylmethanatoboron Difluoride Based on Stereoregular Cyclotetrasiloxanes: Synthesis and Properties

et al. 2023

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A series of new tetrachromophoric systems based on stereoregular tetracyclosiloxanes and dibenzoylmethanatoboron difluoride derivatives have been synthesized and characterized by a complex of physicochemical methods. The photophysical properties of the synthesized compounds are studied by electronic absorption, steady-state, and time-resolved fluorescence spectroscopy. In the synthesized compounds, four dibenzoylmethanatoboron difluoride (DBMBF2)-based fluorophores are in an all-cis arrangement with respect to a cyclotetrasiloxane scaffold. DFT calculations predict that they can form H-type dimers, trimers, or tetramers with an antiparallel orientation of their ground-state dipole moments. Under UV excitation, solutions of these compounds in polar and nonpolar solvents exhibit complex fluorescence consisting of monomer- and excimer-like emissions with different lifetimes. Global fitting analysis reveals the presence of at least four kinetically distinguishable species in the excited state. The studied compounds in solutions have CIE chromaticity coordinates very close to the white color point and are promising objects for the development of next-generation single-emission materials for white illumination.

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Solvent-Dependent Sensitization of Ytterbium and Neodymium via an Intramolecular Excimer

Cited by 15 publications

References 49 publications

Remote Control of Near Infrared Emission with Lanthanide Complexes

Remote Control of Near Infrared Emission with Lanthanide Complexes

Expanding the Range of Pyrenylphosphines and Their Derived Ru(II)-Arene Complexes

Tetrachromophoric Derivatives of Dibenzoylmethanatoboron Difluoride Based on Stereoregular Cyclotetrasiloxanes: Synthesis and Properties

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