Synthesis and crystal structure of the first lanthanide complex of N-confused porphyrin with an (eta)^2 agostic C–H interaction

The reaction of Ln[N(SiMe3)2]3·[LiCl(THF)3]x(Ln = Yb and Er) with N-confused tetraphenylporphyrin (H2NCTPP) followed by Na(LOMe)(LOMe=((eta)^5-C5H5)Co[P(=O)(OMe)2]) gives (NCTPP)Ln(LOMe), whose X-ray structures exhibit an (eta)^2 agostic interaction between the metal centre and the inner C–H bond of the NCTPP ligand.