Preparation and properties of aminoxyl radicals having an aromatic core with long alkyl substituents

Series of monoradicals and biradicals having an aromatic core on one hand and long alkyl groups on the other hand have been prepared. It was found from their magnetic data that the biradical compounds having aromatic cores (azoxy, or azo) and long alkyl groups with TEMPO radicals at their ends showed fairly large antiferromagnetic interactions (J = −34, −39 K) being well expressed by ST model, while only weak antiferromagnetic interactions were observed in the corresponding PROXYL derivatives together with the corresponding monoradicals. The change of intermolecular magnetic interactions based on the structural change from trans- to cis-isomer by irradiation was found to be possible in a couple of azobenzene derivatives with an aminoxyl radical.

Graphical abstractAmong several monoradicals and biradicals having an aromatic core and long alkyl groups prepared, the change of intermolecular magnetic interactions based on isomerization by irradiation was found in a couple of azobenzene derivatives with an aminoxyl radical.Figure optionsDownload full-size imageDownload as PowerPoint slide