Zusammenfassung
The 15 valence-electron iron(I) complex [(CpFe)-Fe-Ar-(IiPr(2)Me(2))] (1, Cp-Ar = C-5(C6H4-4-Et)(5); IiPr(2)Me(2) = 1,3-diiso-propyl-4,5-dimethylimidazolin-2-ylidene) was synthesized in high yield from the Fe-II precursor [(CpFe)-Fe-Ar(mu-Br)](2). Fe-57 Mossbauer and EPR spectroscopic data, magnetic measurements, and ab initio ligand-field calculations indicate an S=3/2 ground state with a large ...
Zusammenfassung
The 15 valence-electron iron(I) complex [(CpFe)-Fe-Ar-(IiPr(2)Me(2))] (1, Cp-Ar = C-5(C6H4-4-Et)(5); IiPr(2)Me(2) = 1,3-diiso-propyl-4,5-dimethylimidazolin-2-ylidene) was synthesized in high yield from the Fe-II precursor [(CpFe)-Fe-Ar(mu-Br)](2). Fe-57 Mossbauer and EPR spectroscopic data, magnetic measurements, and ab initio ligand-field calculations indicate an S=3/2 ground state with a large negative zero-field splitting. As a consequence, 1 features magnetic anisotropy with an effective spin-reversal barrier of U-eff=64 cm(-1). Moreover, 1 catalyzes the dehydrogenation of N, N-dimethylamine-borane, affording tetramethyl-1,3-diaza-2,4-diboretane under mild conditions.
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