Triazatruxene-containing hyperbranched polymers: Microwave-assisted synthesis and optoelectronic properties

Abstract

Hyperbranched polymer structures represent a class of high-functionality building blocks with excellent three-dimensional topology for the construction of highly substituted conjugated polymers. In this contribution, an efficient microwave synthesis protocol toward the synthesis of conjugated hyperbranched polymers is presented. A novel series of soluble hyperbranched polyfluorenes (PTF1-PTF3) incorporating triazatruxene moiety as the branch units with various branching degrees have thus been successfully constructed with good yields and high molecular weight via a facile "A2+B2+C3" approach. The structures of the hyperbranched polymers were confirmed by NMR and GPC. Their thermal, optical, and electrochemical properties of the hyperbranched polymers were also investigated. The results showed that introduction of triazatruxene units into the hyperbranched structure endowed the polymer with good thermal stability and highly amorphous properties. Photophysical investigation of PTFx revealed strong blue emission in both solution and solid states. Hyperbranched polymers with higher degree of branching and proper content of linear fluorene units exhibited better photophysical properties in terms of narrow emission spectra and relatively high quantum efficiency as well as improved thermal spectral stability. The triazatruxene branching unit also played a role in raising the HOMO energy levels relative to those of polyfluorenes that would help to improve the charge injection and transport properties. The incorporation of triazatruxene unit into hyperbranched polymers has thus explored an effective avenue for constructing optoelectronic polymers with improved functional characteristics.hyperbranched polymers, microwave synthesis, triazatruxene, polyfluorene, blue emission

Saturated and stabilized white electroluminescence with simultaneous three-color emission from a six-armed star-shaped single-polymer system

“…[34][35][36][37][38][39][40][41] The methods for the determination of association constants have been reported in our previous contribution. [34][35][36][37][38][39][40][41] TRCZ was synthesized via Suzuki methodology. [ [1,2,5]thiadiazole) (TRCZ) (0.49 g, 0.25 mmol)was dissolved in methylene chloride (30 mL).…”

“…[26,[31][32][33] In our previous contributions, a novel series of monodisperse conjugated star-shaped macromolecules have been designed and synthesized. [34][35][36][37][38][39][40] These star-shaped macromolecules are distinguished for their well-defined chemical structures, good solution processibility, excellent reproducibility, and superior optoelectronic properties. Highly efficient blue and red EL has been successfully realized.…”

Low‐Threshold Non‐Doped Deep Blue Lasing from Monodisperse Truxene‐Cored Conjugated Starbursts with High Photostability

“…According to previousc ontributions, av ariety of conjugated starburst materials with various cores such as truxene, pyrene and triazatruxene, demonstrating efficient electroluminescence and prominent lasing behaviors have been designed and synthesized. [38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53] Because of the synergetic effects of differentm oieties, the molecules manifest good solubility andg reat film-forming behaviors as wella se xcellent stability and high electroluminescence, implying that such starburst molecular structures are promising to achieve excellent lasing behaviors with low thresholds. It is worthwhile to mention that the ability to adjust the architectures by modulation over the core and arms in the terms of am olecular level shows ad irect impact on the electronic and electroluminescent characteristics of the molecules.…”

Microwave assisted novel synthetic route for polyfluorenes containing triphenylamine and solubilizing alkyl moiety for blue emitting diodes

“…Very fast and homogeneous ‘direct molecular heating’ under microwave irradiation results in dramatically reduced reaction times and higher yields. Many simple biaryl couplings and some polymerizations have already been reported, which mainly lead to linear compounds and can easily be achieved traditionally but can now be effectively accelerated by microwave dielectric heating resulting in improved product yields in many cases . The use of microwaves with the Yamamoto reaction condition reduced the time of reaction from 72 h to 35 min.…”