However, the weak hyperfine interactions between the unpaired electron and the more distant nuclei prevented us from obtaining any high-resolution information about the rest of the molecule by EPR. This gap could, however, be filled by paramagnetic NMR. Note that the signals of H1 nuclei, most likely, cannot be observed by NMR, in particular, due to a severe reduction of sensitivity because the large paramagnetic relaxation enhancement expected for these nuclei in close proximity to Yb, or due to the fact that potentially large shifts push them out of the excitation window. Therefore, EPR and NMR spectroscopies could be seen as complementary techniques for the characterization of paramagnetic lanthanide organometallic compounds like Yb[CH(SiMe 3 ) 2 ] 3 , allowing to obtain the information from both internal and external coordination environment of the metal center.