Ullmann coupling for low-cost synthesis of anthracene-based polyfluorenes: A photophysical approach

Abstract

A set of anthracene containing polyfluorenes (PFs) having 9,10-diphenylanthracene with alkyl substituents and aniline containing fluorenes were prepared. Commonly, light-emitting polymers were synthesized using expensive palladium-like catalysts. In the present work, palladium was replaced by copper as a cost-effective PF synthesis catalyst, which is also suitable for large-scale polymer synthesis. Synthesized PFs emit light in the blue region with a bandgap of 2.87–2.90 eV. Thermally stable PFs had a decomposition temperature of more than 305°C and a glass transition temperature of 125–138°C. PFs were soluble in organic solvents and had a molecular weight of around 21,700–25,500. The electrochemical study of these PFs showed low level of highest occupied molecular orbital (HOMO) energy of −5.16 to −5.26 eV, which was significantly higher than that of PF (5.7 eV). These findings suggested that the resulting PFs could be used as a component of the light-emitting diode.

A new nanomagnetic Pd-Co bimetallic alloy as catalyst in the Mizoroki–Heck and Buchwald–Hartwig amination reactions in aqueous media

“…Arylamines and their derivatives possess a paramount importance as intermediates for pharmaceuticals and natural products, agrochemicals, conducting polymers (PANI), and dyes in the chemical industry 57 – 59 . Arylamines are extremely important ligand for the coordination to transition metals 60 .…”

A New Nanomagnetic Pd-Co Bimetallic Alloy as Catalyst in the Mizoroki-Heck and Buchwald–Hartwig Amination Reactions in Aqueous Media

“…Arylamines and their derivatives possess a paramount importance as intermediates for pharmaceuticals and natural products, agrochemicals, conducting polymers (PANI), and dyes in the chemical industry. [54][55][56] Arylamines are extremely important ligand for the coordination to transition metals. 57 The Buchwald-Hartwig coupling of amines and aryl halides in the presence of Pd is a great method for the preparation of arylamines.…”

Flexible and color-tunable poly(ether ether ketone) co-coordinated with Eu(III) and Tb(III) fluorescent films: Thermal stability and luminescence property

“…As a comparison, rare earth polymer complexes not only possess intrinsic fluorescence properties of the rare earth ions, but also exhibit good workability, high chemical stability and excellent process ability. They can be used in fluorescent coatings, 4 laser devices, 5 display techniques, 6 fluorescence detections, 7 drug delivery 8 and optoelectronic devices, 9,10 etc . Rare earth polymer complexes can be divided into two categories: i) doping-type rare earth polymers, which are obtained by simply doping low-molecular rare earth complexes into polymer matrix.…”