Extremely bulky β-diketiminate complexes of calcium(ii) and ytterbium(ii)†
Brant Maitland A , Andreas Stasch A and Cameron Jones
A *
A School of Chemistry, PO Box 23, Monash University, Melbourne, Vic., 3800, Australia.
Australian Journal of Chemistry 75(9) 543-548 https://doi.org/10.1071/CH21283
Submitted: 1 November 2021 Accepted: 13 December 2021 Published: 18 February 2022
© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)
Abstract
The potassium salt of an extremely bulky β-diketiminate, [K(Ar*Nacnac)] (Ar*Nacnac, [(Ar*NCMe)2CH]−; Ar*, C6H2Me{C(H)Ph2}2-4,2,6) was reacted with either CaI2 or YbI2(THF)2, which afforded [(Ar*Nacnac)MI] (M = Ca or Yb). These are the first examples of structurally characterised, donor solvent-free, N-arene substituted β-diketiminato calcium and ytterbium complexes that incorporate a terminal iodide ligand. Reduction of [(Ar*Nacnac)CaI] with sodium metal gave a complex product mixture, from which a few crystals of the β-diketiminate C–H activated product, [{Ca(μ-Ar*Nacnac-H)}2], were obtained and crystallographically characterised. In an attempt to form a terminal ytterbium hydride compound, treatment of [(Ar*Nacnac)YbI] with K[HBEt3] gave a good yield of the contact ion pair compound [(Ar*Nacnac)Yb(HBEt3)].
Keywords: β‐diketiminate, bulky ligand, calcium, C–H activation, metal hydrides, metal–metal bonding, reduction, ytterbium.
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