To find which property contributes the most to the stability of an open-shell electronic structure in the oligomer, as well as other monomers that the GA might have missed, we looked at four different monomer properties: relative HOMO level, relative LUMO level, HOMO-LUMO gap, and their triplet groundstate stability (∆E T -S ). A representative selection of monomers with a range of values for each property were selected, and an oligomer was created for each monomer and monomer 630which was paired with monomer number 642 in the oligomer with the second most stable triplet ground-state (Figure ). We chose to use monomer 630 over monomer 365, which was paired with monomer 642 and had the most stable triplet ground-state, since it contained a 7-membered ring in its backbone which broke its aromaticity and interrupted its conjugation of the πsystem. Monomer 630 has a highly conjugated and aromatic structure that includes a vinyl bridge, and we hypothesized that it will create more consistent and explainable results. The DFT singlet HOMO-LUMO gap and the singlet and triplet electronic energies for each oligomer were calculated as described in Section 2.3.2.