Maier, Thomas M. and Gawron, Martin and Coburger, Peter and Bodensteiner, Michael and Wolf, Robert and van Leest, Nicolaas P. and de Bruin, Bas and Demeshko, Serhiy and Meyer, Franc (2020) Low-Valence Anionic alpha-Diimine Iron Complexes: Synthesis, Characterization, and Catalytic Hydroboration Studies. INORGANIC CHEMISTRY, 59 (21). pp. 16035-16052. ISSN 0020-1669, 1520-510X
Full text not available from this repository. (Request a copy)Abstract
The synthesis of rare anionic heteroleptic and homoleptic alpha-diimine iron complexes is described. Heteroleptic BIAN (bis(aryl)iminoacenaphthene) complexes 1-[K([18]c-6)-(thf)(0.5)] and 2-[K([18]c-6)(thf)(2)] were synthesized by reduction of the [(BIAN)FeBr2] precursor complex using stoichiometric amounts of potassium graphite in the presence of the corresponding olefin. The electronic structure of these paramagnetic species was investigated by numerous spectroscopic analyses (NMR, EPR, Fe-57 Mossbauer, UV-vis), magnetic measurements (Evans NMR method, SQUID), and theoretical techniques (DFT, CASSCF). Whereas anion 1 is a low-spin complex, anion 2 consists of an intermediate-spin Fe(III) center. Both complexes are efficient precatalysts for the hydroboration of carbonyl compounds under mild reaction conditions. The reaction of bis(anthracene) ferrate(1-) gave the homoleptic BIAN complex 3-[K([18]c-6)(thf)], which is less catalytically active. The electronic structure was elucidated with the same techniques as described for complexes 1-[K([18]c-6)(thf)(0.5)] and 2-[K([18]c-6)(thf)(2)] and revealed an Fe(II) species in a quartet ground state.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie > Arbeitskreis Prof. Dr. Robert Wolf |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 08 Mar 2021 13:18 |
| Last Modified: | 08 Mar 2021 13:18 |
| URI: | https://pred.uni-regensburg.de/id/eprint/43418 |
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