Stabilization of intermediate spin states in mixed-valent diiron dichalcogenide complexes.

ABSTRACT: The electronic structure and ground spin states, S, observed for mixed-valent iron-sulfur dimers (Fe^II-Fe^III) are typically determined by the Heisenberg exchange interaction, J, that couples the magnetic interaction of the two metal centres either ferromagnetically (J > 0, S = 9/2) or antiferromagnetically (J < 0, S = 1/2). In the case of antiferromagnetically coupled iron centres, stabilization of the high-spin S = 9/2 ground state is also feasible through a Heisenberg double-exchange interaction, B, which lifts the degeneracy of the Heisenberg spin states. This theorem also predicts intermediate spin states for mixed-valent dimers, but those have so far remained elusive. Herein, we describe the structural, electron paramagnetic resonance and Mössbauer spectroscopic,

SUBMITTER: Henthorn JT 

PROVIDER: S-EPMC8898764 | biostudies-literature | 2022 Mar

REPOSITORIES: biostudies-literature