Access to FeII Bis(σ‐B−H) Aminoborane Complexes through Protonation of a Borohydride Complex and Dehydrogenation of Amine‐Boranes. (19th August 2019)

• Record Type: Journal Article
• Authors: Gorgas, Nikolaus; Stöger, Berthold; Veiros, Luis F.; Kirchner, Karl
• Is Part Of: Angewandte Chemie. Volume 131:Number 39(2019)
• Page Start: 14012
• Page End: 14017
• Publication Date: 2019-08-19
• Subjects: σ-B-H-Komplexe -- Aminoborane -- Amminboran -- Eisen -- Wasserstoffabspaltung; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201906971
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Herein, we report on the first synthesis and structural characterization of the iron based aminoborane complexes [Fe(PNP)(H)(η 2 :η 2 ‐H2 B=NR2 )] + (R=H, Me). These species are formed upon protonation of the borohydride complex [Fe(PNP)(H)(η 2 ‐BH4 )] by ammonium salts [NH2 R2 ] + (R=H, Me). For R=Me, the reaction proceeds via the cationic dinuclear intermediate [{Fe(PNP)(H)}2 (μ 2, η 2 :η 2 ‐BH4 )] + . A mechanism for the reaction is proposed based on DFT calculations that also indicate the final aminoborane complex as the thermodynamic product. All complexes were characterized by NMR spectroscopy, HRMS, and X‐ray crystallography. Abstract : Die erstmalige Synthese und strukturelle Charakterisierung von Fe II ‐basierten Aminoborankomplexen des Typs [Fe(PNP)(H)(η 2 :η 2 ‐H2 B=NR2 )] + (R=H, Me) wird vorgestellt. Diese Spezies bilden sich nach Protonierung des Borhydridkomplexes [Fe(PNP)(H)(η 2 ‐BH4 )] durch Ammoniumsalze NH2 R2 + (R=H, Me).