Photoinduced Synthesis of Dual‐Emissive Tetraphenylethene‐Based Dendrimers with Tunable Aggregates and Solution States Emissions

Abstract

Photoactive materials are actively researched, piloting breakthroughs that have enriched fundamental understanding of science, and have led to real applications. Tetraphenylethene, a photoactive molecule that is of interest from fundamental and applied perspectives, features photochemical properties that are not exploited in the design of photoactive, dual-emissive materials. Here, tetraphenylethene-based, dual-emissive dendrimers are constructed via a synthetic approach that involves a photochemical reaction that exploits the photochemistry of tetraphenylethene. These dendrimers are emissive in solution and in the aggregate state with tunable dual emissions at 368 and 469 nm. The photochemical reaction also tunes the size of the aggregates, increasing the size after UV irradiation. The reported synthetic strategy is a direct and facile approach to accessing dual-emissive macromolecules, especially tetraphenylethene-based systems for real applications.

Quaternized and Thiazole‐Functionalized Free Radical‐Generating Organometallic Dendrimers as Antimicrobial Platform against Multidrug‐Resistant Microorganisms

“…These η 6 ‐arene‐η 5 ‐cyclopentadienyliron(II) dendrimers formed nanoaggregates in poor solvents such as dimethyl sulfoxide/water solvent mixture and the size of the aggregates depends on nature of the terminal group . Here, the aggregates derived from thiazole‐functionalized dendrimers ( DEN9 and DEN10 ) were noticeably different in morphology from those derived from the nonfunctionalized dendrimers ( DEN1 and DEN2 ) and the quaternary ammonium group‐functionalized dendrimers ( DEN7 and DEN8 ) (Figure ).…”

Advances in Light‐Emitting Dendrimers

“…Abd‐El‐Aziz and coworkers have generated fluorescence from macromolecule‐based dendritic and star‐shaped structures . Their work has been focused on the redox active organoiron sandwich complex, η 6 ‐dichloro‐η 5 cyclopentadienyliron(II) as a functional and structural motif to create dendrimers which are photoactive in the aggregated and non‐aggregated states.…”

“…The Abd‐El‐Aziz's group reported dual‐emissive tetraphenylethene based on organoiron dendrimers 156 and 157 ( Figure ) . They examined the photophysics of the organometallic dendrimers, 0‐DEN‐TPE ( 156 ) and 1‐DEN‐TPE ( 156 ), in 100% THF, and in THF/H 2 O mixtures.…”

“…Dual emission tuned by photochemical reaction of dendrimer 156 . Reproduced with permission . Copyright 2016, John Wiley & Sons, Inc.…”

Controlled ROMP Synthesis of Ferrocene‐Containing Amphiphilic Dendronized Diblock Copolymers as Redox‐Controlled Polymer Carriers

“…Ferrocene (Fc)‐containing polymers have attracted increasingly attention in the recent years due to their potential applications in molecular batteries, emissive and photovoltaic materials, catalysis, sensors, nanopatterning, smart hydrogels, and stimuli‐responsive materials . Recently, the emerging focus is the design, fabrication, and various applications of redox‐responsive polymeric carriers formed by using Fc‐containing polymers, which is primarily inspired by the redox chemistry of Fc …”