Dibenzo [a, g] corannulene-phenoxazine dyads: Facile synthesis and optoelectronic properties
Yuming YuRongrong YangWei LanXin WangYaqiong WangMingxing GaoXin XuLei ShenDou WangDuozhi WangAblimit AbdukaderXiaodong CaiZhenjiang LiangHui Tan
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Keywords:
Corannulene
Phenoxazine
Acceptor
The title reaction is described to yield bicyclo[3.2.2]nonatriene derivatives (II) and (V) as sole or main products.
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BODIPY
Quantum yield
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Flash photolysis
Electron donor
Electron acceptor
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Cationic polymerization
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An activated Michael acceptor type of probe by an intramolecular hydrogen bond has shown a selective fluorescence turn-on response to cyanide through a conjugated addition of the nucleophilic anion to the enone probe with a 1300-fold increase in its fluorescence intensity.
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Abstract The chlorophosphino derivative (I) of trimethylethylenediamine is oxidized by DMSO or S8 to give the corresponding phosphonamidic chlorides (II) and (III), respectively.
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Derivative (finance)
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Abstract Es wird gezeigt, daß die endo‐ und exo‐Isomeren der Indanononaphthalino‐Verbindungen (I) und (II) bei Einstrahlung in die (1)Lb‐Bande (315 nm) und den n → π* ‐Übergang (>340 nm) in EPA bei 77 K keine Fluoreszenz des Naphthalin‐Molekülteils und keine Phosphoreszenz der Indanon‐Molekülteils, jedoch Phosphoreszenz des Naphthalin‐Molekülteils liefern.
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Abstract The indanono naphthaleno compounds 1 , 3 , 5 and 7 exhibit, on both irradiation in the 1 L b band (315 nm) and the n → π* transition (> 340 nm) in EPA at 77° K, neither fluorescence from naphthalene nor phosphorescence from indanone, but exclusively phosphorescence from naphthalene, and quenching in liquid solution with 1,3‐pentadiene results in triplet energy transfer from the naphthaleno group only. The naphthalene phosphorescence exhibited by the ketones ( 1 , 3 , 5 , 7 ) has an enhanced quantum efficiency with respect to that on direct excitation of the corresponding hydrocarbons ( 2 , 4 , 6 , 8 ) and more strongly in the exo than in the endo orientation. In order to account for the energy wasting in the intramolecular triplet energy transfer in the endo compounds, a transfer route via a weak triplet donor‐acceptor exciplex, specific to through‐space interaction in the endo configuration (providing for additional radiationless T → S energy dissipation through vibrational coupling), competing with an efficient through‐σ‐bond exchange transfer mechanism operative in both configurations is proposed.
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Biphenyl
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Long-lived charge separated (CS) triplet state (2.6 μs) and thermally activated delayed fluorescence (TADF) [τ = 282 ns (90.4%)/2.4 μs (9.6%)] were observed in an anthraquinone-phenoxazine electron donor-acceptor dyad via the electron spin control method, and emissive 1CS and non-emissive 3CS states were discriminated via nanosecond transient absorption spectroscopy and global analysis.
Phenoxazine
Anthraquinones
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Electron acceptor
Electron donor
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