α-Allenols
are attractive and versatile compounds whose preparation
can be a nontrivial task. In this Letter, we provide a method for
the prompt synthesis of substituted α-allenols via a catalytic
cross-coupling reaction which makes use of a nontoxic and cost-effective
iron catalyst. The catalyst loading is typically as low as 1–5
mol %. The mild reaction conditions (−20 °C) and the short
reaction time (15 min) allow for the presence of a variety of functional
groups. Moreover, the reaction was shown to be scalable up to gram-scale
and the propargyl substrates are readily accessible by a one-pot synthesis.
We report a new emitter 3,4,5-3TCz-TTT based on a tris(triazolo)triazine acceptor that shows thermally activated delayed fluorescence and cross-compare its performance with the recently reported analogue, 3DMAC-TTT. These compounds show...
We demonstrate modular modifications of the widely employed emitter 2,4,5,6-tetra(9H-carbazol-9-yl)isophthalonitrile (4CzIPN) by replacing one or both nitrile acceptors with oxadiazole groups via a tetrazole intermediate. This allows the introduction of various functional groups including halides, alkynes, alkenes, nitriles, esters, ethers and a protected amino acid while preserving the thermally activated delayed fluorescence (TADF) properties. The substituents control the emission maximum of the corresponding emitters, ranging between 472-527 nm, and show high solid-state photoluminescence quantum yields up to 85 %. The TADF emission of two compounds, 4CzCNOXDtBu and 4CzdOXDtBu, a mono-and a bis-oxadiazole substituted 4CzIPN is characterized in detail by time-and temperaturedependent photoluminescence. Solution-processed OLEDs comprising 4CzCNOXDtBu and 4CzdOXDtBu show a significant blue-shift of the emission compared to the reference 4CzIPN, with external quantum efficiencies of 16 %, 5.9 % and 17 % at 100 cd m À 2 , respectively.
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