Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 136, Issue 34, Pages 11964-11971Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja5043116
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Funding
- Deutsche Forschungsgemeinschaft [RO 224/60-1]
- DNRF-funded Center for Materials Crystallography (CMC)
- INPAC
- KU Leuven
- NSF National Science Foundation [DMR-0654118]
- State of Florida
- U.S. Department of Energy
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Cyclic alkyl(amino) carbene stabilized two- and three-coordinate Fe(I) complexes, (cAAC)(2)FeCl (2) and [(cAAC)(2)Fe][B(C6F5)(4)] (3), respectively, were prepared and thoroughly studied by a bouquet of analytical techniques as well as theoretical calculations. Magnetic susceptibility and Mossbauer spectroscopy reveal the +1 oxidation state and S = 3/2 spin ground state of iron in both compounds. 2 and 3 show slow magnetic relaxation typical for single molecule magnets under an applied direct current magnetic field. The high-frequency EPR measurements confirm the S = 3/2 ground state with a large, positive zero-field splitting (similar to 20.4 cm(-1)) and reveal easy plane anisotropy for compound 2. CASSCF/CASPT2/RASSI-SO ab initio calculations using the MOLCAS program package support the experimental results.
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