Table 2 Charging energy E ^N–1–E ^N of different charge states of indigo and Tyrian purple molecules in the SET environment

+2

−7.15

−6.63

+1

−5.46^a

−5.43^a

0

−2.42(2.42)^b

−2.48(2.48)^b

−1

−0.7

−0.89