Extremely rigid ligands offer the ability to precisely tailor the coordination environment around a metal centre. Rigid ligands are particularly useful for fixing bulky substituents in a specific location in order to kinetically stabilize a reactive metal centre and to impede ligand activation pathways. The Emslie group has successfully employed this strategy using the extremely rigid dianionic pincer ligand, 4,5-bis(2,6-diisopropylanilido)-2,7-di-tert-butyl-9,9-dimethyl-xanthene (XA2), to isolate a rare non-Cp bis(alkyl) thorium complex, [(XA2)Th(CH2SiMe3)2],[1] a non-Cp dicationic thorium species, [(XA2)Th]2+,[2] and non-Cp monocationic organothorium species, [(XA2)Th(CH2Ph)]+ and [(XA2)Th(CH2SiMe3)]+.[2,3] In order to adapt the XA2 ligand for the trivalent rare earths versus the tetravalent actinides, a series of new, extremely rigid monoanionic pincer ligands were developed. The synthesis of these new rigid ligands will be described and the structure and reactivity of organoyttrium complexes containing these ligands will be discussed.[1] C.A. Cruz, D.J.H. Emslie, et al. Organometallics 2007 , 26, 692. [2] C.A. Cruz, D.J.H. Emslie, et al. Organometallics 2008 , 27, 15. [3] C.A. Cruz, D.J.H. Emslie, et al. Organometallics 2009 , 28, 1891.

Organoyttrium complexes bearing a new class of extremely rigid monoanionic pincer ligand

248th National Meeting (2014)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.