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. 2020 May 1;6(18):eaaz0632. doi: 10.1126/sciadv.aaz0632

Fig. 2. Synthesis and fundamental chemical properties of BQQDI derivatives.

Fig. 2

(A) Scheme for the syntheses of BQQ–TCDA and BQQDI derivatives (C8–BQQDI, PhC2–BQQDI, and 4-Hep–BQQDI). (B) Cyclic voltammograms obtained from 4-Hep–PDI (0.5 mM; blue), 4-Hep–BQQDI (0.5 mM; red), and PDI–FCN2 (0.2 mM; green) in benzonitrile. (C) Time-dependent UV-vis spectra obtained from 4-Hep–BQQDI in benzonitrile (4 × 10−6 M) under ambient air. (D) TG plots obtained from PhC2–BQQDI (blue) and C8–BQQDI (red) at a heating rate of 1 K min−1 under a stream of nitrogen. Inset: DTA data up to 400°C. a.u., arbitrary units.