The cyclic voltammetry measurements were conducted on a HY 1550 A mini electrochemical analyzer. All samples (2 mg·mL−1) were evaluated in anhydrous dichloromethane at a scan rate of 100 mV·s−1. Bu4NPF6 was used as an electrolyte at a concentration of 0.2 M. Saturated calomel electrode was used as a reference electrode, with a glassy-carbon electrode used as a working electrode, and Pt wire as a counter electrode; and Fc/Fc+ was used as an external reference. The redox potential level for the standard hydrogen electrode was calculated with the equation: ENHE = ESCE + 0.24 V.
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