MAGNETIC-RESONANCE PARAMETERS AND STRUCTURE OF SUBSTITUTED STANNYLOXYPHENOXYL RADICALS - INVESTIGATION BY MEANS OF ESR IN THE 2-MM BAND

For studies of objects in the general class of substituted stannyloxyp henoxyl radicals, an ESR method in the 2-mm wavelength band has been u sed. With this approach, it has been possible to resolve completely fo r these compounds the anisotropy of the g-tensor and to obtain structu ral information on such objects at ''low'' temperatures (approximately 145 K), at which registration of isotropic liquid-phase spectra has a lready become impossible. Analysis of the magnetic resonance parameter s obtained in these studies has made it possible to estimate contribut ions to the g-tensor from different atoms in molecules of this type. I t has been shown that ESR in the 2-mm band is effective not only in ob taining structural information, but also for observing certain dynamic effects that are not accessible for ESR in the 3-cm band.