Aggregation‐Induced Emission in Tetrathia[8]circulene Octaoxides via Restriction of the Dynamic Motion of their Negatively Curved π‐Frameworks

Curved polycyclic aromatic hydrocarbons exhibit intriguing properties, but their flexible and dynamic nature is often considered to be unfavorable for achieving excellent emission properties. In this study, we prepared tetrathia[8]circulene octaoxides that adopt a negatively curved conformation. We found that these molecules exhibit aggregation‐induced...

1d

Recent Progress on Defect‐rich Transition Metal Oxides and Their Energy‐Related Applications

The applications of many energy‐related electrochemical energy conversion and storage devices are changing with each passing day. Oxygen evolution reaction(OER), hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR) are the key steps in the commercial application of these energy conversion/storage equipment. Defect‐rich transition metal...

1d

A Lead‐free Organicnorganic Halide Perovskite Absorber with Photoconductive Response

A lead‐free organic‐inorganic hybrid perovskite, (C5H7N2) BiI4 (1, C5H7N2 + is 2‐aminopyridinium), exhibits a remarkable photoresponse under light illumination. 1 not only features highly applicable properties but is also able to absorb across most of the UV/Vis region of the solar spectrum. High‐quality single crystal with sizes up to 7×6×4 mm3 was...

2d

Oxygen doped g‐C3N4 with nitrogen vacancy for enhanced photocatalytic hydrogen evolution

An O‐doped g‐C3N4 framework with abundant N defects was developed as a photocatalyst to boost photocatalytic hydrogen production. Abstract Generally, bulk graphic carbon nitride (g‐C3N4) suffers from fast photogenerated charge carrier combination, inferior light absorption and insufficient active sites. Herein, we developed a defect engineering...

2d

On‐surface Synthesis of a Chiral Graphene Nanoribbon with Mixed Edge Structure

Chiral graphene nanoribbons represent an important class of graphene nanomaterials with varying combinations of armchair and zigzag edges conferring them unique structure‐dependent electronic properties. Here, we describe the on‐surface synthesis of an unprecedented cove‐edge chiral GNR with a benzo‐fused backbone on a Au(111) surface using 2,6‐dibromo‐1,5‐diphenylnaphthalene...

3d

Adaptive σ‐Aromaticity in an Unsaturated Three‐Membered Ring

Adaptive σ‐aromaticity is first demonstrated in an unsaturated three‐membered ring, which is a traditional domain for π‐aromaticity. Abstract Based on Hückel's and Baird's rules, species are aromatic either in the lowest singlet state (S0) or the lowest triplet state (T1) only. Thus, species with adaptive aromaticity (with aromaticity in both...

3d

Ultralow‐Molecular‐Weight Stimuli‐Responsive and Multifunctional Supramolecular Gels Based on Monomers and Trimers of Hydrazides

The simpler, the better. Simple hydrazide LMWGs (MW: 140–200) have been designed and synthesized for self‐healing, multi‐response fluorescence, and visual and selective chiral recognition and S2− indicator. Cyclohexane‐hydrazide monomers self‐assemble to form gels through intermolecular hydrogen bonds and dipole‐dipole interactions, but phthalhydrazide...

3d

Applications of Metal Nanocrystals with Twin Defects in Electrocatalysis

In this minireview, fundamental insights into the enhancement mechanism induced by twin defects as well as recent breakthrough achieved in electrocatalytic applications of twin metal nanocrystals are summarised. Abstract Electrocatalytic energy conversion is one of the most promising pathways to develop clean and renewable energy technologies,...

3d

Direct Introduction of Sulfonamide Groups into Quinoxalin‐2(1H)‐ones by Cu‐Catalyzed C3‐H Functionalization

Cu‐catalyzed C3‐H sulfonamidation of quinoxalin‐2(1H)‐ones by C−H/N−H cross‐dehydrogenation coupling has been reported. This reaction tolerates various quinoxalin‐2(1H)‐ones and sulfonamides to afford 3‐sulfonamidated quinoxalin‐2(1H)‐one derivatives. Abstract Direct sulfonamidation of quinoxalin‐2(1H)‐one derivatives has been developed using...

3d

Cover Picture

MoS2‐based materials have recently emerged as alternatives to noble metals as electrocatalysts for the hydrogen evolution reaction (HER) owing to their abundance and low cost. The HER properties of MoS2 can be improved in three ways: activating the inert basal plane to improve intrinsic activity, increasing active edge sites, and improving the conductivity....

3d