title: Broken-symmetry DFT spin densities of iron nitrosyls, including Roussin's red and black salts: striking differences between pure and hybrid functionals.
abstract: Pure and hybrid exchange-correlation functionals, as typified by OLYP and B3LYP, respectively, yield dramatically different spin density profiles for a variety of paramagnetic iron nitrosyls. Not unexpectedly, based on the strongly noninnocent nature of the NO ligand, the strength of metal-NO spin coupling appears to vary widely as a function of the functional chosen. For the diamagnetic Roussin's red salt, red salt esters, and black salt, OLYP and B3LYP yield very different Fe-Fe spin coupling strengths, with OLYP exhibiting a greater preference for a more spin-coupled description.
authors.affiliation: Department of Chemistry and Center for Theoretical and Computational Chemistry, University of Tromsø, N-9037 Tromsø, Norway.
authors.forename: Kathrin H
authors.initials: KH
authors.lastname: Hopmann
authors.forename: Jeanet
authors.initials: J
authors.lastname: Conradie
authors.forename: Abhik
authors.initials: A
authors.lastname: Ghosh