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ESR powder spectra of several differently bridged bis-galvinoxyl biradicals have been recorded. The spectra can be interpreted in terms of a weak electron-electron dipolar coupling between the unpaired spins of randomly oriented triplet molecules. Using MO-theory and a point charge model for atomic orbitals a detailed structural analysis is performed on the basis of quantum mechanical calculations. Taking into account the twist angles between the various aryl rings the experimental data can be explained satisfactorily.

zeitschrift für naturforschung b

Über Galvinole und Galvinoxyle, III. EPR-Spektroskopie an regellos orientierten Bis-Galvinoxyl-Biradikalen in der Glasmatrix / On Galvinols and Galvinoxyls, III. EPR Study of Zero Field Splitting in Randomly Oriented Galvinoxyl Biradicals