Phototriggered Mechanical Movement in A Bipyridinium-based Coordination Polymer Powered by Electron Transfer

Photomechanical movement with a morphological deformation has been achieved in the crystalline state of a bipyridinium-based coordination polymer. The engine “heart” is the electron-deficient bipyridinium core sandwiched by electron-rich phenylcarboxylate components. The decorrelation of the CT state triggered by PET reaction in the engine “heart” promotes the occurrence of this mechanical movement

Bipyridinium-Bearing Multi-stimuli Responsive Chromic Material with High Stability

Interests in chromic materials are rapidly increasing for their potential applications as smart responsive materials. However, the majority of the existing ones are triggered by merely one or two outer stimuli and the few multi-stimuli responsive examples still suffer from their confining functioning state such as solution or polymer. To address these challenges, a new generation of multi-stimuli responsive chromic materials is being intensively pursued. In this article, we report a neoteric supramolecular solid material by assembling Co­(II) ion with bipyridinium-functionalized ligand in solvothermal condition. This material can perform reversible chromic behaviors in response to 365 nm light, heat, vacuum, ammonia, ethanediamine, and some organic solvents. Meanwhile, it exhibits excellent structural stability and reversibility to cope with these stimuli

Meglumine: A Novel and Efficient Catalyst for One-Pot, Three-Component Combinatorial Synthesis of Functionalized 2‑Amino‑4<i>H</i>‑pyrans

An efficient one-pot synthesis of functionalized 2-amino-4<i>H</i>-pyrans by a meglumine-catalyzed three-component reaction has been developed. A broad range of substrates including aromatic and heteroaromatic aldehydes, isatin derivatives, and acenaphthenequinone are condensed with enolizable C–H activated compounds and alkylmalonates to give the desired products in high to excellent yields. This methodology provides an alternative approach for rapid access to construct a diversity-oriented library of 4<i>H</i>-pyrans