Journal
INORGANIC CHEMISTRY
Volume 58, Issue 2, Pages 1252-1266Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.8b02730
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Funding
- West Virginia University
- National Science Foundation [CHE-1336071, CHE-1228336]
- National Science Foundation EPSCoR Research Infrastructure Improvement Cooperative Agreement [1003907]
- State of West Virginia (WVEPSCoR via the Higher Education Policy Commission)
- WVU Research Corporation
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Two square-planar high-spin Fe-II complexes bearing a dianionic pyridine dipyrrolate pincer ligand and a diethyl ether or tetrahydrofuran ligand were synthesized and structurally characterized, and their electronic structures were elucidated by a combined spectroscopic and computational approach. In contrast to previous examples, the S = 2 ground states of these square-planar Fe-II complexes do not require an overall anionic charge of the compounds or incorporation of alkali metal cations. The tetrahydrofuran complex exhibits an equilibrium between four- and five-coordinate species in solution, which was supported by H-1 NMR and Fe-57 Mossbauer spectroscopy and comparison to a structurally characterized five-coordinate pyridine dipyrrolate iron bis-pyridine adduct. A detailed computational analysis of the electronic structures of the four- and five-coordinate species via density functional theory provides insight into the origins of the unusual ground state configurations for Fe-II in a square-planar ligand field and explains the associated characteristic spectroscopic parameters.
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