Fig. 6. Plots of the reorganisation energy and solid-state electron affinity for all molecules sampled across all 20 runs of the evolutionary algorithm, minimising fitness function F_A (10 runs) and F_B (10 runs). A total of 15 870 unique molecules (23.3% of the total chemical space) are sampled in this combined set of searches. Points are plotted with three different colour series: (a) molecule sampled by fitness function F_A and not F_B (F_A − F_B), F_B and not F_A (F_B − F_A) or F_A and F_B (F_A ∩ F_B); (b) colour coded by number of nitrogen atoms in the molecule and (c) by degree of non-linearity in the molecular structure (as defined in the ESI†). Locations of four azapentacenes molecules proposed by Winkler and Houk¹⁵ (WH5A–WH7B) are labelled on each plot.