Molecular spin sensor for in-situ monitoring of crystallization behavior and phase transition in aromatic materials

Aza-metallofullerene Y₂@C₇₉N, in which one carbon atom of the cage is substituted with a nitrogen atom, has an electron spin localized on the internal Y₂ cluster (Fig. 1a, b). In solution, Y₂@C₇₉N shows three distinct groups of EPR signals owing…