Three new metal–radical complexes of the formula [M(NITm-Py) 2 (N 3 ) 2 (DMSO) 2 ] [M=Cu(II) 1, Ni(II) 2, Co(II) 3; NITmPy=2-(3′-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide] were synthesized and characterized structurally as well as magnetically. Three complexes are three-spin complexes in which two NITmPy radical ligands are coordinated to the metal ion through the nitrogen atoms of the pyridyl rings. The magnetic behaviors of the three complexes are investigated. Complexes 1 and 2 show ferromagnetic interactions while antiferromagnetic coupling is predominant for complex 3. The magnetic properties are analyzed in connection with their structures and the magnetic exchange mechanism is discussed.