Figure 2
From: Resonant X-ray photo-oxidation of light-harvesting iron (II/III) N-heterocyclic carbene complexes
Schematic representation of the metal-ligand interactions in the quasi-octahedral ligand field-splitting convention for \(\hbox {Fe}^{{\rm{II}}}\) and \(\hbox {Fe}^{{\rm{III}}}\) complexes with closed shell \(3\hbox {d}^6\) and open shell \(3\hbox {d}^5\) electronic configurations respectively. The dashed arrow indicates the electron in the \({\hbox {t}_{{\rm{2g}}}}\) that is only present in the \(\hbox {d}^6\) case. The left and right of the figure shows the molecular orbitals originating from the metal ion and ligand respectively. The combination of these orbitals in an octahedral geometry is depicted in the centre of the figure.
