Controlled chain end coupling of boron subphthalocyanines of synthetic polymers
In previous studies, we synthesized the first organic light emitting diode (OLED) using boron subphthalocyanines (BsubPcs) based polymers. When designing new polymer materials for organic electronic applications such as OLEDs or organic photovoltaic (OPV) devices it is important to consider not only the contribution of each monomer but also the polymer chain ends. In this paper we establish a post-polymerization strategy to couple BsubPcs onto either the α- or the ω-chain end using chemically selective BsubPc derivatives. We outline how the chain ends of two representative polymers, poly(styrene) (PS) and poly(n-butylacrylate) (BA), synthesized by nitroxide mediated polymerization (NMP), using BlocBuilder-MA as the initiating species, can be chemically modified by the incorporation of BsubPc chromophores. The addition of the BsubPc chromophore was confirmed through the use of a photodiode array detector (PDA) connected in-line with a gel permeation chromatography (GPC) setup. These findings represent the first reported method for the controlled and selective placement of a BsubPc chromophores on either end of a polymer produced by NMP. This strategy will therefore be utilized to make next generation BsubPc polymers for OLEDs and OPV devices. The extremely high molar extinction coefficient of BsubPc also make these polymers ideally suited for dye-labelling of polymers.
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