Stable Ni^II Porphyrin meso-Oxy Radical with a Quartet Ground State

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 high-spin state of the Ni^II center. The radical exhibited a quartet ground state, indicating the ferromagnetic interaction between the high-spin Ni^II center (S=1) and the porphyrin meso-oxy radical (S=1/2).