The 1 H, C{ 1 H}, Si DEPT90 and 31 P{ 1 H} NMR spectra collected for solutions of 1-Ln in C6D6 were all fully assigned (see In the previous report of 1-Nd, only one signal was observed in the 1 H NMR spectrum of a C6D6 solution at -2.24 ppm and this was assigned to the SiMe3 groups; THF resonances were not observed in the 1 H NMR spectrum and no signals were seen in the C{ 1 H}, Si{ 1 H} and 31 P{ 1 H} NMR spectra collected due to paramagnetic broadening of resonances into the baseline. However, cryogenic NMR probes can provide drastically increased sensitivity for NMR experiments by reducing thermal noise, and as we have this facility we were able to observe resonances in the 1 H, C{ 1 H}, Si DEPT90 and 31 P{ 1 H} NMR spectra for all paramagnetic 1-Ln reported herein following experimental optimizations (see Supporting