Fig. 2: Insights from thermodynamic analyses of the S. oneidensis-triggered RAFT polymerization. | Nature Communications

Fig. 2: Insights from thermodynamic analyses of the S. oneidensis-triggered RAFT polymerization.

From: Photo-excited extracellular electron transfer of electroactive microorganism triggers RAFT polymerization

Fig. 2: Insights from thermodynamic analyses of the S. oneidensis-triggered RAFT polymerization.

a Electrons generated from S. oneidensis reduce flavins from the oxidized flavins to the fully reduced FLhq. The reduced electron mediator FLhq reacts with CTA1 (2-ethylsulfanylthiocarbonylsulfanyl-propionic acid methyl ester) to produce radical (black arrow, left), whereas the reduction reaction was thermodynamically infeasible. Upon the blue light irradiation, FLhq was excited to its excited state FLhq*, which enabled transfer of the electrons to CTA1 to generate radicals via PET (green arrow, right). b 1H NMR spectra of the monomer N, N-dimethylacrylamide (DMA) in the mixture of S. oneidensis, DMA, CTA1, and exogenously added flavins (riboflavin (RF) or FMN), where no radical polymerization was observed. And 1H NMR spectra of the Poly(N, N-dimethylacrylamide) (PDMA) polymer synthesized in the polymerization system upon photoexcitation using riboflavin or FMN as the electron mediator, respectively. c Calculated Gibbs energy profile of the electron transfer pathways from flavins (riboflavin or FMN) to CTA1. Source data were provided as a Source Data file.

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