Towards highly substituted starburst macromolecular semiconductors: Microwave synthesis, spectroscopy and electrochemical properties

As part of a strategy to explore highly functionalized macromolecular semiconductors, a series of highly substituted twelve-armed macromolecules F1CzTr-F3CzTr consisting of truxene, 9-phenylcarbazole and oligofluorene units were synthesized. To accomplish the synthesis of twelve-armed targets, a high yield microwave enhanced synthesis method for direct twelve-fold Suzuki couplings was developed. The resulting materials exhibited high purity and good monodispersity (PDI 1.01-1.03). The molecular weight of the compound F3CzTr achieved 14 266 g · mol^-1, representing one of the largest well-defined starburst conjugated molecules. The thermal, photophysical and electrochemical properties were investigated. Highly substituted twelve-armed semiconducting macromolecules F₁CzTr-F₃CzTr consisting of truxene, 9-phenylcarbazole and oligofluorene segments are facilely constructed via a powerful microwave-enhanced synthesis method. The resulting materials exhibit high purity and good monodispersity (PDI 1.01-1.03) with the molecular weight of the largest one achieved 14266g · mol^-1.(Figure Presented)