Fig. 4: Electronic properties of VSc2C@D5h(6)-C80 and VSc2C@D3h(5)-C78.

a UV-vis−NIR spectra of VSc2C@D5h(6)-C80 and VSc2C@D3h(5)-C78 dissolved in toluene. Insets: Photographs of their corresponding solutions in toluene. b Cyclic voltammograms of VSc2C@D5h(6)-C80 and VSc2C@D3h(5)-C78 in o-DCB solution with ferrocene (Fc) as the internal standard under different scan regions. Scan rate: 100 mV/s, TBAPF6 as supporting electrolyte. The half-wave potentials (E1/2) of each redox step are marked with a solid dot to aid comparison. The asterisk labels the oxidation and reduction peaks of ferrocene.