Figure 4.

Superimposed experimental (thick lines) and simulated (thin lines) ⁵⁹Co solid-state NMR spectra corresponding to the indicated B₁₂ derivatives. (Left) Spectra recorded on the samples as purchased. (Right) Spectra recorded on samples crystallized by slow evaporation. Line shapes were fitted at all magnetic fields simultaneously as described in the text, by using the coupling parameters summarized in Table 1.