NHC‐Stabilized Parent Phosphinidene Adducts of Metal(II) Hexamethyldisilazanides of Manganese – Cobalt and Their Lability in Solution. Issue 17 (20th January 2022)

• Record Type: Journal Article
• Authors: Weller, Ruth; Gonzalez, Andres; Gottschling, Hannah; von Hänisch, Carsten; Werncke, C. Gunnar
• Is Part Of: Zeitschrift für anorganische und allgemeine Chemie. Volume 648:Issue 17(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-01-20
• Subjects: phosphinidene -- 3d transition metal -- silylamides -- structure -- NMR spectroscopy; Chemistry, Inorganic -- Periodicals; Chemistry -- Periodicals; 540
• DOI: 10.1002/zaac.202100338
• Languages: English
• ISSNs: 0044-2313

Abstract

Abstract: The behavior of the N ‐heterocyclic carbene (NHC) stabilized 'parent' phosphinidene [(sIDipp)PH] (Dipp=2, 6‐di‐ iso propylphenyl) towards 3d‐metal(II) hexamethyldisilazanides is described. This leads to formation of the three‐coordinated phosphinidene adducts [M{PH(sIDipp)}{N(SiMe3 )2 }2 ] (M=Mn−Co), as evidenced by X‐Ray diffraction analysis. In solution, all compounds exhibit strong paramagnetism that limited NMR spectroscopic examinations to cobalt. Here it shows that the system is coordinatively highly fluxional, which is mitigtated upon cooling. At low temperatures, small amounts of free phosphinidene becomes further evident by 31 P NMR spectroscopy that implicates in part ligand coordination competes with [M{N(SiMe3 )2 }2 ] dimerisation and an overall weak binding of the phosphinidene ligand. The rapid chemical exchange is evidenced in the presence of an excess of phosphinidene or a phosphine (PCy3 ), whereas diethyl ether proved as a stronger donor ligand. Abstract :