Analogue signals complex numbers

Recently McConnell has introduced the technique of labelling proteins lipid membranes, and DNA, with a stable organic free radical, the nitro-xide radical, see reference (24). A measurement of the line shapes of the ESR signal of this label has revealed the rotational times of the molecules to which it is bound. If paramagnetic analogues of the anti-tumour compounds are found then their progress within a cell will be readily followed using ESR. Complexes of all the metals of Table 1 with odd numbers of electrons (d1, d3, d5 and d1) are potentially useful. Thus... 

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