Nitroxide-Substituted Nitronyl Nitroxide and Iminonitroxide

摘要

We report on the highly compact nitroxide-substituted nitronyl nitroxide 1 and iminonitroxide 2; they have isoelectronic structures with trimethylenemethane. These diradicals are stable under aerated conditions at room temperature and have large positive exchange interactions: J/k_B = +390 K (H = −2JS_1/2·S_1/2) for 1 and J/k_B ≈ +550 K for 2.