We have previously reported that [CoCp2] + [pd] •-did not exhibit 1 H resonances which could be assigned to pd •-. Surprisingly, however, the 1 H NMR spectra of 1-Ln and 3-LnLnʹ exhibit resonances which are assigned to 1 H environments of the pd •-ligands. We attribute this to the coordination of Ln 3+ in the O,Oʹ binding site of pd •-. The ), confirming our assignment of the ligand oxidation state as pd •-in both 1-Ln and 3-LnLnʹ. Solid-state structural data are tabulated in the ESI (Table ) along with additional crystallographic information including the molecular structures of 2-Eu and 3-DyYb (ESI Section B5).