Some electrochemically generated elemento-organicradical ions and metal complexes as studied by esr

ESR spectra have been obtained for the radical anions Ph_nEl^XXX , where El = P, Si or As, and also for substituted nitrobenzenes. Radical anions were generated by electrochemical reduction within a microwave cavity. The nature and stability of radical ions and other paramagnetic species were established by the investigation of the electrochemical behaviour of the substances. The spin density distribution shows that atoms of the elements in Ph_nEl^XXX are not to be taken as “isolating bridges”. Spin density distributions have also been established for other radical ions.Paramagnetic complexes Mo^V and W^V have been prepared by electrochemical reduction of appropriate molybdenum and tungsten compounds and their structure and magnetic parameters have been established.