Bis(hydroxylaminato)-mono(pentamethylcyclopentadienyl) rare-earth metal complexes

Abstract

Salt metathesis reactions involving the anhydrous rare-earth metal trichlorides MCl₃ (M = Y, Ho, Er and Lu) and the N,N-diethylhydroxylaminato potassium salt, KONEt₂ (1), and KC₅Me₅ result in formation of rare-earth metal hydroxylaminato complexes of the type [(C₅Me₅)M(μ-η¹:η²-ONEt₂)(η²-ONEt₂)]₂ (M = Y (2a), Ho (2b), Er (2c) and Lu (2d)). Compound 1 was characterised by elemental analysis, compounds 2a and 2d by NMR spectroscopy and compounds 2a–d by elemental analyses, mass-spectrometry and single crystal X-ray diffraction. Compounds 2a–d are isostructural in the solid state. Effective saturation of the coordination sphere of the rare-earth metal atoms by the hydroxylaminato groups is achieved by the formation of three-membered MON rings.