Evidence for the photochemical formation of a high-valent 2A2u antimony porphyrin π-radical cation

Irradiation of [SbV(tpp)(OH)2]+ (tpp=dianion of 5,10,15,20-tetraphenylporphyrin) at 298 K in argon saturated dichloromethane under steady state conditions results in the formation of the highly oxidising π-radical cation [SbV(tppradical dot)(OH)2]2+ with spectral characteristics corresponding to a 2A2u electronic ground state.