Ferrocene substituted nitronyl nitroxide and imino nitroxide radicals. Synthesis, X-ray structure and magnetic properties

The synthesis, X-ray structure and magnetic properties of two new ferrocene substituted nitroxide monoradicals are described. The magnetic susceptibil ity data was nicely fitted in both cases to the Curie-Weiss law yielding th e Weiss constants of theta = - 1.8 and - 1.1 K for radicals 1 and 2, respec tively. This result evidenced the presence of very weak antiferromagnetic i ntermolecular interactions between neighbor molecules. Moreover, the X-ray structure of the key precursor 2,3-bis(hydroxyamino-)-2,3-dimethylbutane (3 ) is also included. (C) 2001 Elsevier Science B.V. All rights reserved.