The NMR spectra of the VO(acac)$_2$ and Cu(acac)$_2$ complexes are sharp and have small shifts but those of the Mn(acac)$_3$ and Fe(acac)$_3$ complexes are broad and have much larger shifts of ~20 ppm (for the methyl groups). Suggest why there are large shift differences.
Also, you will investigate the spectrum of the paramagnetic [Co(o-phenanthroline)$_3$]Cl$_2$ complex where the shifts are very much larger, as shown below.
Figure 2
diamagnetic
paramagnetic
Suggest why this is.
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fl (ppm)