Figure 1
(a) Bimodal BVS distribution for iron(II) sites in the CSD using literature R0 values, with oxidation state assigned by the ligand-template method. (b) An example of a crystal structure with two iron(II) sites in different spin states (CSD Refcode ABEQUV). Although both Fe atoms were assigned an oxidation state of 2 and have a coordination number of 6, Fe1II—N distances span 1.911–2.067 Å, while Fe2II—N distances span 2.146–2.299 Å. |