Kationische stickstoffdotierte helikale Nanographene

Xu, Kun; Fu, Yubin; Zhou, Youjia; Hennersdorf, Felix; Machata, Peter; Vincon, Ilka; Weigand, Jan J.; Popov, Alexey A.; Berger, Reinhard; Feng, Xinliang

doi:10.1002/ange.201707714

Cited by 31 publications

(2 citation statements)

References 72 publications

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“…The used monomers were previously reported, [ 27,28 ] and the new fluorescent polymers were synthesized according to the references. [ 29,30 ]…”

Section: Methodsmentioning

confidence: 99%

Synthesis of Novel Fluorescent Conjugated Polymers and Their Rapid Gas‐Phase Detection of Trace Nitro‐Explosives

Liu,

Chen,

Zhang

et al. 2023

Macro Chemistry & Physics

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Fluorescent conjugated polymers are widely investigated for their excellent performance in detecting explosives. In this work, two simple monomers are used to synthesize two novel fluorescent conjugated polymers, 3 and 6, with different conjugated structures via the linkages of “single bond” and “alkyne bond” by coupling reaction, and the fluorescence sensing performance for 2,4,6‐trinitrotoluene (TNT) is verified in both liquid and gas phases, aiming to demonstrate the influence of two different linkages on the fluorescence sensing properties. The fluorescent intensities of conjugated polymers in organic solvents gradually increase with increasing concentration within the low concentration range, while too high concentration leads to a decrease in the emission intensity because of the concentration quenching effect. The liquid‐phase limit of detection of 3 and 6 for TNT is as low as 1.9 and 1.6 µm in acetonitrile, respectively. The change rule of UV–vis absorption indicates that the static quenching model of TNT is predominant in liquid phase. Using a commercial portable explosives detector, 3 and 6 can effectively achieve the selective detection of gas‐phase TNT above 15 ng within 7 s and 8 ng within 5 s, respectively, demonstrating the great potential for rapid on‐site detection of trace explosives.

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“…The used monomers were previously reported, [ 27,28 ] and the new fluorescent polymers were synthesized according to the references. [ 29,30 ]…”

Section: Methodsmentioning

confidence: 99%

Synthesis of Novel Fluorescent Conjugated Polymers and Their Rapid Gas‐Phase Detection of Trace Nitro‐Explosives

Liu,

Chen,

Zhang

et al. 2023

Macro Chemistry & Physics

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“…25 , 26 In recent years, numerous helicenes with pyridinic nitrogen doping have been synthesized and employed as chiral switches. 27 – 30 This demonstrates that the chiroptical properties of nitrogen-doped helicenes can be tailored through coordination, protonation, or other reactions involving pyridinic nitrogen. 31 – 33 Based on these results, it was hypothesized that the simultaneous incorporation of helical chirality and pyridinic nitrogen doping could then be employed to yield chiral nitrogen-doped nanographene.…”

Section: Introductionmentioning

confidence: 97%

Diazananographene with Quadruple [5]Helicene Units: Synthesis, Optical Properties, and Supramolecular Assembly

Ma,

Xing,

Chai

et al. 2024

Organic Materials

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A helical diazananographene (1) was synthesized using sterically hindered t-butyl groups to inhibit further dehydrocyclization of [5]helicene units. These t-butyl groups stabilized the conformation of [5]helicene units, thus resulting in three stable conformers of 1, comprising a pair of enantiomers (1-(P, P, P, P) and 1-(M, M, M, M)) and a mesomer (1-(P, P, M, M)). In comparison to its planar analogs, helical 1 exhibited broadened peaks in its absorption and emission spectra, with an increase in the emission quantum yield from 0.3 to 0.6. The significantly enhanced radiative decay rate (kr) accounted for the increase in the quantum yield of 1. It was found that 1 could be fully protonated upon the addition of an equivalent acid. Furthermore, 1 assembled into a chiral trimeric metallosupramolecular complex upon coordination with the PdII units. Both protonated 1 and the metallosupramolecular complex of 1 exhibited an enhanced circular dichroic response. These findings revealed that the incorporation of a helical structure and pyridinic nitrogen-doping into the nanographene can allow the synthesis of responsive chiroptical graphenic materials, which can serve as building blocks for chiral hierarchical metallosupramolecular structures.

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Palladium‐Catalyzed Regioselective Aromatic Extension of Internal Alkynes through a Norbornene‐Controlled Reaction Sequence

Zhao

Kwong

2018

Angewandte Chemie

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A regioselective aromatic π‐extension reaction of internal alkynes is reported. The proposed method employs three easily available components, namely aryl halides, 2‐haloarylcarboxylic acids, and disubstituted acetylenes. The transformation is driven by a controlled reaction sequence of C−H activation, decarboxylation, and annulation to give poly(hetero)aromatic compounds in a site‐selective fashion. Unlike in previously reported palladium‐catalyzed three‐component annulations, alkyne carbopalladation is the last step of this tandem reaction.

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Kationische stickstoffdotierte helikale Nanographene

Cited by 31 publications

References 72 publications

Synthesis of Novel Fluorescent Conjugated Polymers and Their Rapid Gas‐Phase Detection of Trace Nitro‐Explosives

Synthesis of Novel Fluorescent Conjugated Polymers and Their Rapid Gas‐Phase Detection of Trace Nitro‐Explosives

Diazananographene with Quadruple [5]Helicene Units: Synthesis, Optical Properties, and Supramolecular Assembly

Palladium‐Catalyzed Regioselective Aromatic Extension of Internal Alkynes through a Norbornene‐Controlled Reaction Sequence

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