Homoleptic lanthanide(ii)–bis(guanidinate) complexes, [Ln(Giso)2] (Giso = [(ArN)2CN(C6H11)2]−, Ar = C6H3Pri2-2,6): planar 4-coordinate (Ln = Sm or Eu) vs distorted tetrahedral (Ln = Yb) geometries

Abstract

The first homoleptic lanthanide(II)–guanidinate complexes have been prepared and shown to have differing coordination geometries (including unprecedented examples of planar 4-coordination) that depend on the size of the lanthanide metal.