this is likely due to the increased anisotropic paramagnetic broadening associated with these ions. Resonances between δSi values of -65.5 and -82.3 ppm in the Si DEPT90 NMR spectra of 1-M were assigned to the metal-bound silicon atoms (Figure ); the Si DEPT NMR spectral windows were +175 to -225 ppm. The Si shifts observed fall within a relatively narrow range, considering the differences in both paramagnetism and size of the metal ions across the 1-M series, as the exchange dynamics will vary with metal-ligand distances. The consistent observation of metal-bound silicon resonances for the most paramagnetic 1-M when some SiMe3 resonances were not seen is in accord with increased line-broadening for the latter signals from dynamic THF exchange outweighing the relative effects of paramagnetic broadening. In the 1 H- Si HMBC NMR spectra of 1-M correlations were seen between δSi(MSi) and the δH(Si(CH3)3) signals corresponding to group 1, but no cross-peaks were observed between δSi(MSi) and the group 2