PEGylated Perylenemonoimide-Dithienylethene for Super-Resolution Imaging of Liposomes

We have designed and synthesized an amphiphilic photoswitchable fluorophore, PEGylated perylenemonoimide-dithienylethene (PEG-PMI-DTE), which exhibits evident bistable photochromism, fluorescence switching, and fatigue resistance. The fine nanostructures of liposomes can be observed directly under super-resolution fluorescent microscopy by aid of the amphiphilic photoswitchable fluorophore as a staining agent, with an optical resolution of 30 nm

Geminal Cross-Coupling of 1,1-Dibromoolefins Facilitating Multiple Topological π‑Conjugated Tetraarylethenes

The cross-coupling reactions have been used in C–C bond formation which can be used extensively in optoelectronic materials for organic light-emitting diodes, organic photovoltaics, and chemical biosensing. Here, we report 2-fold geminal C–C bond formation at 1,1-dibromoolefins via cross-coupling reactions of aromatic boronic esters over Pd catalysts for multiple topological configurations of π-conjugated molecules. We employ a series of recipes from a precursor toolbox to produce π-conjugated macrocycles, conjugated dendrimers, linear conjugated polymers, and multiple conjugated microporous polymers and nanoparticles. The π-conjugated macrocycles, dendrimers, and linear polymers show characteristic aggregation-induced emission properties. The conjugated microporous polymers possess unique porosity of 2–3 nm. The microporous polymer nanoparticles can be redispersed in solution. This universal strategy toward definite topological configurations of π-conjugated molecules enables efficient coupling of aryl bromides with various coupling partners under mild conditions affording multiple topological conjugated systems with abundant optical and optoelectronic interest