In S0, there is a minute increase in the aromaticity when going from 10 to 12 according to MCI, in line with earlier findings based on NICS, but in the lowest 3 n,* state there is instead a minute decrease (Figure ). The MCI( 3 n,*)tot values of 10 -12 are similar to those of 1 and 2 (Figure ), however, their residuals (with MCI( 3 n,*)tot at 42 -47% of the MCI(S0) values) tend toward antiaromatic character whereby they resemble 1 more 21 than 2. This is consistent with the fact that both C and P have low electronegativity, and that P has been labelled a "carbon copy". With regard to the lone-pair orbitals, which are singly occupied in the lowest 3 n,* states, they are more localized on P than on N (Figure ), but if one instead views the lone-pair orbital which is unoccupied it resembles the corresponding orbital in S0 and is more localized on N than on P. Although oversimplified, in the Introduction we put forth that the (anti)aromatic character of the residual and the vertical E( 3 n,*) may correlate among isomers. Indeed, there is no extensive variation in the (anti)aromatic character in neither the S0 states of 10 -12 nor in the residuals of their 3 n,* states, and the variation in their vertical E( 3 n,*) is modest (3.34 -3.60 eV), in line with the postulation. Furthermore, the 3 n,* states of 10 -12 are not the T1 states but higher states (Figure ), a fact that might be explained by the non-or antiaromatic character of the residual of the n,* state. The T1 states are instead of * character.