Pyridone derivatives carrying radical moieties were prepared, namely a nitronyl nitroxide derivative 5-(4′, 4′, 5′, 5′-tetramethylimidazoline-3′-oxide-1′-oxyl)-2 (1H)-pyridone (1) and a verdazyl derivative 1, 5-dimethyl-3-[2 (1H)-pyridone]-6-oxoverdazyl (2). In the solid state, 1 and 2 form, via N–H⋯ O intermolecular hydrogen bonds between the pyridone moieties, a zigzag one-dimensional chain structure and a cyclic dimer structure, ...
