Energetics of paramagnetic oxide clusters: the Fe(III) oxyhydroxy Keggin ion
Phys. Chem. Chem. Phys., 2020, DOI: 10.1039/C9CP05795A. Link
Abstract: The energetics of the different spin states of the five Baker-Figgis isomers of the iron(III) Keggin ion, [Fe(O4)(Fe(OH)2 (OH2))12]7+, has been investigated using density functional theory in order to demonstrate how the energy landscape of medium-to-large discrete paramagnetic transition metal oxide clusters with large numbers of antiferromagnetically coupled centres can be resolved. Antiferromagnetic coupling causes the energies to span a surprisingly large range of 30 kcal/mol, as determined by calculating the energies of all 664 unique spin configurations based on determination of the antiferromagnetic coupling constants by density functional theory. A program which simplifies the resolution of the energetics of this type of systems is also provided.