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Keywords = reversible fluorescence turn off/on

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42 pages, 7875 KB  
Review
Survey of Recent Advances in Molecular Fluorophores, Unconjugated Polymers, and Emerging Functional Materials Designed for Electrofluorochromic Use
by Ilies Seddiki, Brelotte Idriss N’Diaye and W. G. Skene
Molecules 2023, 28(7), 3225; https://doi.org/10.3390/molecules28073225 - 4 Apr 2023
Cited by 13 | Viewed by 3867
Abstract
In this review, recent advances that exploit the intrinsic emission of organic materials for reversibly modulating their intensity with applied potential are surveyed. Key design strategies that have been adopted during the past five years for developing such electrofluorochromic materials are presented, focusing [...] Read more.
In this review, recent advances that exploit the intrinsic emission of organic materials for reversibly modulating their intensity with applied potential are surveyed. Key design strategies that have been adopted during the past five years for developing such electrofluorochromic materials are presented, focusing on molecular fluorophores that are coupled with redox-active moieties, intrinsically electroactive molecular fluorophores, and unconjugated emissive organic polymers. The structural effects, main challenges, and strides toward addressing the limitations of emerging fluorescent materials that are electrochemically responsive are surveyed, along with how these can be adapted for their use in electrofluorochromic devices. Full article
(This article belongs to the Special Issue Feature Papers in Materials Chemistry)
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15 pages, 4603 KB  
Article
Synthesis of Novel Aqua ƞ4-NNNO/Cu(II) Complexes as Rapid and Selective Oxidative Catalysts for O-Catechol: Fluorescence, Spectral, Chromotropism and Thermal Analyses
by Amjad M. Shraim, Kifah S. M. Salih, Ranim E. Al-Soufi, Soaad R. Al-Mhini, Mohammad I. Ahmad and Ismail Warad
Crystals 2021, 11(9), 1072; https://doi.org/10.3390/cryst11091072 - 4 Sep 2021
Cited by 8 | Viewed by 3444
Abstract
A new tetradentate Schiff base (SB), (E)-4-fluoro-2-(1-((2-(piperazin-1-yl)ethyl)imino)ethyl)phenol, was synthesized from condensation of 2-(1-piperazinyl)ethylamine and 5-fluoro-2-hydroxyacetophenone. This ligand was coordinated with three copper(II) salts (CuCl2, CuBr2 and Cu(NO3)2⸱3H2O) separately, giving rise to new neutral water-soluble [...] Read more.
A new tetradentate Schiff base (SB), (E)-4-fluoro-2-(1-((2-(piperazin-1-yl)ethyl)imino)ethyl)phenol, was synthesized from condensation of 2-(1-piperazinyl)ethylamine and 5-fluoro-2-hydroxyacetophenone. This ligand was coordinated with three copper(II) salts (CuCl2, CuBr2 and Cu(NO3)2⸱3H2O) separately, giving rise to new neutral water-soluble Cu(II)/ƞ4-NNNO complexes (13). The new materials were fully characterized by standard spectroscopic, elemental, thermal, electronic, absorption, and fluorescence analyses. The chromotropism investigation of the aqueous solutions of the complexes revealed notable outcomes. A turn off-on halochromism effect was observed, both in the acidic and basic mediums. The green-colored solution was changed to colorless (off) upon the addition of HCl, while the initial green color was reversibly restored (on) after the addition of NaOH. On the other hand, bathochromic solvatochromism shifts were noticed in various solvents. Interestingly, complex 2 displayed a remarkable blue fluorescence shift (Δλ = 90 nm) when compared to its SB ligand. The oxidation capability of the three complexes was successfully demonstrated for the conversion of o-catechol to o-benzoquinone in aqueous solutions and in the presence of H2O2, an environmentally friendly oxidant, under mild reaction conditions. Full article
(This article belongs to the Special Issue New Trends in Crystals at Saudi Arabia)
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