MAGNETIC RESONANCE STUDIES OF SOME PHENOXY AND NITROXIDE BIRADICALS

We have taken the nmr and esr spectra of a series of phenoxy and nitroxide biradicals. The susceptibilities of these compounds were measured by monitoring the shifts of internal diamagnetic reference peaks as a function of radical concentration. The sign and magnitude of most of the electron-nuclei coupling constants could be determined from these data. In some instances we were able to measure singlet-triplet energy separations. Both the contact shifts and the susceptibilities were measured at a series of different temperatures. © 1969, American Chemical Society. All rights reserved.