Fig. 4. (a–d) Cyclic voltammograms of BI2Ps 1′–4′ (dashed lines). The cyclic voltammograms of analogous BIPs 1–4 (solid lines) are included for comparison. Concentration: 1 mM of the indicated compound, 0.5 M TBAPF6 supporting electrolyte in dry acetonitrile. WE: glassy carbon. Pseudo RE: Ag wire (ferrocene as internal reference). CE: Pt wire. Scan rate, 100 mV s−1. Compound 3′ has low solubility in acetonitrile.
