The establishment of simple molecular design strategy to realize red-shifted emission while maintaining good color purity for multi-resonance induced thermally activated delayed fluorescent (MR-TADF) materials remains an appealing yet challenging...

Facile synthesis of the S, O codoped g-C3N4 photocatalysts.

Disclosed here is a palladium‐catalyzed direct [4+1] spiroannulation of ortho‐C−H bonds of naphthols with cyclic diaryliodonium salts to construct spirofluorenyl naphthalenones (SFNP) under mild reaction conditions. This spiroannulation directly transforms the hydroxy group into a carbonyl group, and also tolerates reactive functional groups such as the halo groups, which provide an opportunity to rapidly assemble structurally new thermally activated delayed fluorescent (TADF) materials that feature a carbonyl group with an adjacent spirofluorenyl unit as the acceptor. As an illustrated example, the OLED device utilizing the assembled DMAC‐SFNP as the host material exhibits a low turn‐on voltage of 2.5 V and an ultra‐high external quantum efficiency of 32.2 %. This work provides inspiration for structurally new TADF materials, and also displays the potential of C−H activation as a synthetic strategy for the innovation of optoelectronic materials.

1,1′-Bi(hetero)aryl 2-sulfonamide scaffolds have been widely used as a privileged structure in drug discovery. Herein, we report an efficient rhodium-catalyzed oxidative C−H/ C−H cross-coupling between a (hetero)aromatic sulfonamide and a (hetero)arene to afford ortho-sulfonamido bi(hetero)aryls. This methodology features broad substrate scope, good functional group tolerance, and relatively inexpensive catalyst (without the use of RhCp*). A wide range of (hetero)arenes such as thiophenes, benzothiophenes, pyrroles, furans, benzofuran, indolizine, and simple arenes can engage in this transformation. This protocol also provides a facile route to bi(hetero)aryl sultams and dibenzo[b,d]thiophene 5,5-dioxides through further intramolecular cyclization, indicating its potential application in materials exploitation.

Described herein is the first example of mechanically induced single-molecule white-light emission based on excited-state intramolecular proton transfer (ESIPT) materials. Mechanism of mechanochromism is clearly disclosed by powder and single...