Varying Anionic Functional Group Density in Sulfonate-Functionalized Polyfluorenes by a One-Phase Suzuki Polycondensation
摘要:
A series of anionically functionalized polyfluorene-based conjugated polyelectrolytes were synthesized by the Suzuki polycondensation of the boronic ester 2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9,9-di(1-(2-(2-methoxyethoxy)ethoxy)ethyl)fluorene with the ionic and nonionic dihalides 2,7-dibromo-9,9-di(6-sodium sulfonate-hexyl) fluorene and 2,7-dibromo-9,9-di( 1(2-(2-methoxyethoxy)ethoxy)ethyl)fluorene. The latter monomer served as a diluent to control the ionic functional group density. The use of the triethylene glycol monomethyl ether derivatives made possible a one-phase polyconclensation in a THF/methanol/Na2CO3(aq) mixture using Pd(PPh3)(4). The one-phase nature of the polymerization was essential to balancing the reactivity of the dihalides so that they were both incorporated into the same polymer and so that the polymer composition became dictated by the monomer feedstock composition: In closely related two-phase reactions, a mixture of polymers, one ionic and one nonionic, was isolated with no control over ionic functional group density possible. Using the one-phase approach, polyfluorene-based polyelectrolytes were synthesized with 2-20 aromatic rings per sulfonate group.
Varying Anionic Functional Group Density in Sulfonate-Functionalized Polyfluorenes by a One-Phase Suzuki Polycondensation
摘要:
A series of anionically functionalized polyfluorene-based conjugated polyelectrolytes were synthesized by the Suzuki polycondensation of the boronic ester 2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9,9-di(1-(2-(2-methoxyethoxy)ethoxy)ethyl)fluorene with the ionic and nonionic dihalides 2,7-dibromo-9,9-di(6-sodium sulfonate-hexyl) fluorene and 2,7-dibromo-9,9-di( 1(2-(2-methoxyethoxy)ethoxy)ethyl)fluorene. The latter monomer served as a diluent to control the ionic functional group density. The use of the triethylene glycol monomethyl ether derivatives made possible a one-phase polyconclensation in a THF/methanol/Na2CO3(aq) mixture using Pd(PPh3)(4). The one-phase nature of the polymerization was essential to balancing the reactivity of the dihalides so that they were both incorporated into the same polymer and so that the polymer composition became dictated by the monomer feedstock composition: In closely related two-phase reactions, a mixture of polymers, one ionic and one nonionic, was isolated with no control over ionic functional group density possible. Using the one-phase approach, polyfluorene-based polyelectrolytes were synthesized with 2-20 aromatic rings per sulfonate group.
Tuning the structures of polypyridinium salts as bifunctional cathode interfacial layers for all-solution-processed red quantum-dot light-emitting diodes
作者:Shuguang Fu、Xiaojun Yin、Yang Tang、Guohua Xie、Chuluo Yang