title: ESR studies of porphyrin pi-cations: the 2A1u and 2A2u states.
mesh_terms: D001547:Benzaldehydes; D001966:Bromine; D002713:Chlorine; D003903:Deuterium; D004578:Electron Spin Resonance Spectroscopy; D008274:Magnesium; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000032:analysis; D010084:Oxidation-Reduction; D010100:Oxygen; D010472:Perchlorates; D011166:Porphyrins / Q000032:analysis*; D011758:Pyrroles; D013053:Spectrophotometry; D013056:Spectrophotometry, Ultraviolet; D015032:Zinc
chemical_list: D001547:Benzaldehydes; D009942:Organometallic Compounds; D010472:Perchlorates; D011166:Porphyrins; D011758:Pyrroles; D002713:Chlorine; D003903:Deuterium; D008274:Magnesium; D015032:Zinc; D010100:Oxygen; D001966:Bromine