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Differentiating Molecular Weights of Supramolecular Polymers in Lower Monomer Concentrations by Coreaction
Jingke Pan1, Qianxi Duan1, Zhengqiong Lai1
1Pingyuan Laboratory, College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
Abstract:
Nuclear magnetic resonance is the most conventional approach to characterizing the molecular weight (Mw) of supramolecular polymers (SPs) at high monomer concentrations. However, it remains a great challenge to determine SPs with lower Mw values because the increased monomer concentrations will assemble dynamically to larger SPs. In this contribution, we developed an SP-regulated electrochemiluminescence (ECL) strategy for differentiating the Mw of SPs in low monomer concentrations. It was found that the SPs with lower Mw could serve as a coreaction accelerator to provide larger electrochemically active surface areas and promote the oxidation process of coreactant tripropylamine (TPrA), resulting in improved ECL intensity. Therefore, a novel ECL platform has been successfully established to differentiate the Mw of SPs at lower monomer concentrations. Our finding not only offers a deep understanding of the SP-regulated ECL performances but also provides the possibility for differentiating the Mw of SPs via coreaction accelerator-mediated ECL, particularly in low monomer concentrations.
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