10,15,20-Tris(pentafluorophenyl) substituted Ni-II-porphyrin meso oxy radical bearing two coordinating pyridines was synthesized as a stable radical with a quartet ground state (S = 3/2). X-ray structural analysis revealed that the Ni-II-porphyrin moiety is fairly planar and the Ni-N bond lengths are considerably longer, indicating the highspin state of the Ni-II center. The radical exhibited a quartet ground state, indicating the ferromagnetic interaction between the high spin NiII center (S = 1) and the porphyrin meso oxy radical (S = 1/2).