Calculations with a singlet or quintet multiplicity may be expected to result in iron(II) low spin and high spin electronic structures. For 1 and 2, the singlet and quintet electronic structures retain an intermediate spin iron(II) ion; the remainder of the unpaired spin-up or spin-down electrons is delocalised in the π system of the graphene plane. For 3, a closed-shell singlet species is found, whereas the quintet species is also characterised by uptake of unpaired electrons in the ligand plane. In all cases, the lower and higher multiplicity electronic structures are destabilised by at least 10 kcal mol -1 and are not considered further. In short, all three models feature an intermediate spin iron(II) ground state, and hence their ligand field strengths appear comparable.