The ligands of the complex are expected to exhibit substantial dynamics, which has the effect of averaging the signals. This was observed in the case of the Lu analogue, where variable temperature 1 H solution NMR data were required to partially freeze out these motions and the individual 1 H resonances were obtained by cooling the sample. However, this approach was not successful for the present Yb complex, where no such resolution was obtained over a temperature range between 285 and 182 K, and no detection was possible beyond that because of increased line-broadening (see SI Chapter 3 & Fig. ).