Highly selective Palladium-catalyzed Suzuki coupling reaction toward chlorine-containing electroluminescence polymers

• The reactivity of chlorine was completely restrained in optimized Suzuki coupling reaction.
• The chlorine-bearing polymers were firstly straightforward synthesized under optimized Suzuki couplings.
• The polymers showed high molecular weight, large Stokes shift and low self-absorption.
• The PLEDs of the polymers exhibited red emission with high brightness based on dopant/host system.

High selectivity and yield from aryl–aryl coupling reactions between chlorine-containing aromatic bromides and organoboron reagents are reported. The variable reaction selectivity between the bromine and chlorine mainly depends on the electronic effects of the aromatic substrates. The reactivity of the chlorine can be completely restrained by employing the optimized Palladium catalysts, which can be used for the preparation of the chlorine-bearing molecules. Then, a series of high molecular weight conjugated copolymers with chlorine on the backbones are straight forward synthesized for the first time under Suzuki condensation reaction. The polymers show large Stokes shifts and low self-absorption. Efficient and high brightness red emission centre at about 636 nm can be obtained when doping the resulting polymer into F8BT.

High selectivity and yield of aryl–aryl coupling reactions between chlorine-containing aromatic bromides and organoboron reagents are reported. The reactivity of the chlorine can be completely restrained by employing the optimized Pa catalysts. Then, a series of high molecular weight conjugated copolymers with chlorine on the backbones are achieved for the first time under the optimized Suzuki couplings. Efficient and high brightness red emission centre at about 636 nm can be obtained when doping the resulting polymer into F8BT.Figure optionsDownload as PowerPoint slide