- Two-photon fluorescent holographic rewritable micropatterning
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Monomeric amorphous systems involving an upper azo-based layer and a lower fluorophore layer have been carefully designed to enable holographic formation of micrometric emissive photopatterns through reversible photoinduced mass migration of azoderivatives. The fluorescent patterns evidenced by NIR biphotonic excitation match the micrometric surface relief. After successful erasure by using a circularly polarized visible light, new patterns can be written again. Copyright
- Ishow, Elena,Brosseau, Arnaud,Clavier, Gilles,Nakatani, Keitaro,Pansu, Robert B.,Vachon, Jean-Jacques,Tauc, Patrick,Chauvat, Dominique,Mendonca, Cleber R.,Piovesan, Erick
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- Supramolecular Polymerization of Triarylamine-Based Macrocycles into Electroactive Nanotubes
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A S6-symmetric triarylamine-based macrocycle (i.e., hexaaza[16]paracyclophane), decorated with six lateral amide functions, is synthesized by a convergent and modular strategy. This macrocycle is shown to undergo supramolecular polymerization in o-dichlorobenzene, and its nanotubular structure is elucidated by a combination of spectroscopy and microscopy techniques, together with X-ray scattering and molecular modeling. Upon sequential oxidation, a spectroelectrochemical analysis of the supramolecular polymer suggests an extended electronic delocalization of charge carriers both within the macrocycles (through bond) and between the macrocycles along the stacking direction (through space).
- Gavat, Odile,Giuseppone, Nicolas,Lehn, Jean-Marie,Maaloum, Mounir,Moulin, Emilie,Picini, Flavio,Schneider, Susanne,Strub, Jean-Marc,Tan, Junjun,Tokunaga, Shoichi,Vargas Jentzsch, Andreas
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p. 6498 - 6504
(2021/05/06)
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- Electrophilic nitration of triphenylamines as a route to high oxidation potential electrocatalysts. Polynitration, nitrodebromination, and bromine dance
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The nitration of triphenylamine derivatives is facile, readily leading to an introduction of up to three nitro groups at room temperature. The nitration of 4,4′,4″-tribromotriphenylamine results in nitrodebromination on one or more rings and bromination a
- Wu, Xin,Dube, Mufaro A.,Fry, Albert J.
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p. 7667 - 7669
(2007/10/03)
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- Construction of electrocatalytic electrodes bearing the triphenylamine nucleus covalently bound to carbon. A halogen dance in protonated aminotriphenylamines
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The triarylamine nucleus has been attached to a carbon fiber electrode by diazotization of an aminotriphenylamine followed by electrochemical reduction. The resulting electrodes can electrocatalyze the oxidation of organic substrates. In acid, 4-amino-4′,4″-dibromotriphenylamine undergoes dismutation into a mixture of amines containing from 0 to 3 bromine atoms.
- Mayers, Brian T.,Fry, Albert J.
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p. 411 - 414
(2007/10/03)
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- Photochemical nitration by tetranitromethane. Part XXXVIII. Nitration of tris(4-bromophenyl)amine, a compound corresponding to a stable radical cation
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The photochemical reaction between tris(4-bromophenyl)amine (TBPA) and tetranitromethane in dichloromethane or acetonitrile gave almost exclusively the nitro-debromination product, 4-nitrophenylbis(4′-bromophenyl)amine (1). In the presence of trifluoroacetic acid, the 2-nitro-substitution product, 4-bromo-2-nitrophenylbis(4′-bromophenyl)amine (3) also appeared, together with further brominated TBPAs (4). Preparative and kinetic studies of the individual reactions involved, viz. the TBPA-NO2, TBPA+-NO2 and TBPA+-trinitromethanide ion reactions, indicated that the simple regiochemistry of the photochemical reaction is due to an addition-elimination mechanism, in which the initial attack of trinitromethanide ion occurs at the carbon ipso to the nitrogen function. Acta Chemica Scandinavica 1997.
- Eberson, Lennart,Hartshorn, Michael P.,Svensson, Jan Olof
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p. 279 - 288
(2007/10/03)
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- Electron-transfer Oxidation of Trinitromethanide Ion by Radical Cations
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The reaction between tris(4-X-phenyl)aminium ions (X = Br, Cl) and trinitromethanide ion in dichloromethane or acetonitrile takes place by one-electron transfer, eventually leading to nitro derivatives of the triarylamines.
- Eberson, Lennart,Radner, Finn,Svensson, Jan Olof
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p. 1140 - 1141
(2007/10/02)
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