Abstract

The rotation of spin probes, i.e. stable nitroxyl radical varying in shape and size of molecule, has been studied in natural rubber and ethylbenzene. The use of exact g-tensors and super-fine reaction tensors makes possible the determination of the extent of non-spherical rotation of the radicals. This depended in the case of 2,2,6,6-tetramethylpiperidin-1-oxyl (although not with larger-size radicals) on the matrix and the temperature. These features are due to a rotation anisotropy in the first case which is caused by the radicals reacting with the molecules of the surrounding medium, while it is the shape of the molecule in the second case.

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