Electrofluorochromism deals with electrochemical monitoring of luminescence features. There are several reasons to be interested in that field. The first one is the design displays working a similar way electrochromic devices, substituting colors due absorption emission, thus producing much higher brilliance. This requires designing smart molecules and materials, which likely exhibit reversible switch emission by controlling their redox state. also lot analytical applications, especially...

New tetrazines substituted by heteroatoms have been synthesized and their electrochemical photochemical properties investigated. All compounds are reversibly electroactive with standard potentials shifting cathodically according to the donor character of substituent. The tetrazine derivatives also fluorescent maximum emission wavelengths in range 550-575 nm. Some them show very long fluorescence lifetimes (several tens ns) remain solid state without major changes spectral features. one can...

Abstract New fluorescent tetrazines have been prepared and their electrochemistry fluorescence efficiency evaluated. The occurrence of as well the wavelength were found to be strongly dependent on substituents, which electronegative heteroatoms. This has rationalized through a computational study that showed crucial factor is nature HOMO, determines existence or not fluorescence. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)

Broad-frequency dielectric behaviors of multiwalled carbon nanotubes (MWCNTs) embedded in room temperature vulcanization silicone rubber (RT-SR) matrix were studied by analyzing alternating current (ac) impedance spectra, which would make a remarkable contribution for understanding some fundamental electrical properties the MWCNT/RT-SR nanocomposites. Equivalent circuits nanocomposites built, and law polarization mechanism electric conductance under ac field acquired. Two parallel RC series...

Abstract A facile, efficient and metal‐free synthetic approach to 3‐monosubstituted unsymmetrical 1,2,4,5‐tetrazines is presented. Dichloromethane (DCM) for the first time recognized as a novel reagent in chemistry of tetrazines. Using this 11 3‐aryl/alkyl were prepared excellent yields (up 75 %). The mechanism new reaction, including role DCM tetrazine ring formation, has been investigated by 13 C labeling DCM, also presented discussed well photophysical electrochemical properties.

A new heteroleptic polypyridyle Ru(II) complex was synthesized and deposited on surface by the diazonium electroreduction process. It yields to covalent grafting of a monolayer. The functionalized characterized XPS, electrochemistry, AFM, STM. precise organization molecules within monolayer is observed with parallel linear stripes separated distance 3.8 nm corresponding lateral size molecule. Such suggests strong cooperative process in deposition This strategy an original way obtain...

Original tetrazines substituted by heterocyclic rings have been prepared. Their syntheses, as well their electrochemical and spectroscopic features, are described. Calculations also made on the cation radicals, anion radicals neutral compounds in correct agreement with experimental results. All electroactive, both oxidation reduction, display two absorption bands UV visible regions of spectrum. Reduction potentials maximum wavelengths correlated electron-rich character substituent tetrazine...

Two iridium(III) soft salts based on ion-paired dinuclear cationic and mononuclear anionic complexes were designed investigated as phosphorescent emitters for solution processed OLEDs. New prepared with two different bridging ligands, a carbazole phenylene spacer. Best devices the salt bearing moiety.

The study of the chemical and electrochemical fluorescence switching properties a family substituted triphenylamine derivatives is reported.

Abstract The synthesis, photophysical and electrochemical properties as well theoretical calculation studies of a newly designed triphenylamine derivative are described. This original compound displays one neutral form, three oxidized forms, two protonated forms with distinct characteristics. interplay the emission protonation or redox state (electrofluorochromism) has been explored an on–off–on–off fluorescence switching was observed in case oxidation on–on–off protonation.

A series of "push-pull" salts substituted with an electron-donating bis(N,N-dimethyl)aniline unit and different electron-withdrawing methyl or chelating pyridinium units have been designed synthesized from Michler's ketone. The spectroscopic electronic properties were investigated compared to their DAST homologues. studies revealed that a lower HOMO-LUMO gap is obtained in all cases, showing the ability our donor increase effect. Two chromophores terpyridine as acceptor end group also prepared.

Abstract New dyes based on BODIPY and tetrazine fluorophores connected through a phenyl spacer have been synthesized their absorption, emission electrochemical properties characterized. can be reversibly oxidized into stable cation radical whereas reduced to anion radical. The absorption studies demonstrate that both behave independently. bichromophoric compounds show an expected very weak by the core is quenched phenoxytetrazine mainly energy transfer. DFT calculations...

Original new fluorescent and electroactive compounds have been prepared, where the moiety is a chloroalkoxy-s-tetrazine. Besides tetrazine, several of these possess second active group, or able to absorb light at lower wavelength. The electrochemical properties photophysical bichromophoric investigated, especially focusing on occurrence energy electron transfer tetrazine. In one case, primary absorber naphthalimide, quasi-complete transfer, followed by tetrazine fluorescence, observed. This...

A very sensitive technique where an electrochemical cell is coupled to a total internal reflection fluorescence microscopy setup described and applied for the first time monitoring of organic dyes in solution. It shown that this basically allows both spatial resolution recorded signal as function electrode potential: indeed variations emission intensity are within diffusion layer classical cyclic voltammetry or chronoamperometry experiment inducing redox conversion emissive form into non one...

Abstract Original new fluorescent and electroactive compounds have been prepared, which feature two different groups linked through an oxygen atom spacer. We describe here the synthesis, photophysical electrochemical properties their interplay, our theoretical calculations. These molecules are composed of fluorophores, electron‐rich triphenylamine unit electron‐poor tetrazine unit. Although bichromophores not in neutral state due to a photoinduced electron transfer from unit, one can restore...

A series of emitting push–pull triarylamine derivatives, models their widely used homologues in photonics and organic electronics, was investigated by steady-state time-resolved spectroscopy. Their structural originality stems from the sole change electron-withdrawing substituent X (–H: 1, –CN: 2, –NO2: 3, –CHC(CN)2: 4), giving rise to efficient emission tuning blue red upon increasing character. All compounds are highly fluorescent alkanes. The more polar 2–4 undergo considerable Stokes...

We have covalently grafted tetrazine derivatives to graphene oxide through nucleophilic substitution. Since the unit is electroactive and nitrogen-rich, with a reduction potential sensitive type of substituent degree substitution, we used electrochemistry X-ray photoelectron spectroscopy demonstrate clear evidence for grafting covalent bonding. Chemical modification was supported by Fourier transform infrared thermal analysis. Tetrazines onto displayed different mass losses compared...

A new Ir(iii) cyclometallated complex bearing a fluorenyl 5-substituted-1,10-phenanthroline ligand ([Ir(ppy)2()][PF6], ppy = 2-phenylpyridine) is presented which exhibits enhanced triplet oxygen sensing properties. The efficacy of this to act as photosensitiser for altering the morphology C6 Glioma cells that represent malignant nervous tumours has been evaluated. increased heavy metal effect and related spin-orbit coupling parameters on photophysical properties are evidenced by comparison...

A facile efficient synthetic tool, Buchwald–Hartwig cross-coupling reaction, for the functionalization of 1,2,4,5-tetrazines is presented. Important factors affecting reaction have been optimized. Seven new donor–acceptor tetrazine molecules (TA1–TA7) were conveniently prepared in good to high yields (61–72%). They subsequently engaged inverse electron demand Diels–Alder (iEDDA) with cyclooctyne. The photophysical and electrochemical properties pyridazines studied. Some are fluorescent...

Luminescent hybrid silica nanoparticles grafted with tetrazines fluorophores have been synthesized and characterized, their photophysical electrochemical properties studied in acetonitrile solutions. The behavior of the functionalized shows a bright fluorescence emission, emission excitation bands typical chloroalkoxytetrazines fluorophores, albeit some degree quenching because interchromophoric interactions. Their presence various low molecular weight amines. Extinction photoinduced...