Activation of Molecular Hydrogen by Inter‐ and Intramolecular Al−N Lewis Pairs. Issue 13 (19th February 2021)

• Record Type: Journal Article
• Authors: Bodach, Alexander; Nöthling, Nils; Felderhoff, Michael
• Is Part Of: European journal of inorganic chemistry. Issue 13(2021)
• Page Start: 1240
• Page End: 1243
• Publication Date: 2021-02-19
• Subjects: Aluminum -- Main group elements -- Hydrogen -- Crystal growth -- Structure elucidation; Chemistry, Inorganic -- Periodicals; Organometallic chemistry -- Periodicals; Bioinorganic chemistry -- Periodicals; Solid state chemistry -- Periodicals; 546
• DOI: 10.1002/ejic.202001152
• Languages: English
• ISSNs: 1434-1948

Abstract

Abstract: The field of frustrated Lewis pair chemistry offers many opportunities to activate molecular hydrogen, but Al−N systems have not been established yet. In this work, we describe several intermolecular classical Al−N Lewis pairs and an intramolecular ortho‐ala‐aminoarene for the activation of molecular hydrogen. Their ability was investigated using the isotope exchange reaction from HD to H2 and D2 . The herein studied intermolecular Lewis pairs were based on alkylalanes and N‐methyldiphenylamine, while the intramolecular Lewis pair was ( o ‐TMP−C6 H4 )AlH2 ((2‐(2, 2, 6, 6‐tetramethyl‐piperidin‐1‐yl)phenyl)‐aluminium dihydride). The activation of molecular hydrogen was carried out in toluene under mild conditions and monitored by 1 H and 2 H NMR spectroscopy. Furthermore, the Al−N interaction has been probed by 27 Al NMR and crystallographic studies. Additionally, the crystal structure of pure Al i Bu3 was determined. These studies may attribute the pronounced reactivities of these Al−N compounds to elongated Al−N bond lengths. Abstract : Several intermolecular classic Al−N Lewis pairs of alkylalanes and N‐methyldiphenylamine, as well as an intramolecular ortho‐ala‐amino‐arene, were tested for their ability to activate hydrogen by studying the isotope exchange reaction of HD and successive 1 H and 2 H NMR spectra. The Al−N interaction has been probed by NMR spectroscopy and crystallographic studies, including those of pure Al i Bu3 .