Electronic and electrochemical properties of cationic complexes [Fe(R-Sal)2Trien]+ in solution: Evidence of formation of phenoxyl radicals upon oxidation

Electronic and electrochemical properties of four ferric [Fe(R-Sal)2Trien]+ complexes with R = 5-OMe, 5-Cl, 5-Br and 3,5-Cl2 were studied. The occurrence of thermally-induced spin equilibria in solution was demonstrated by optical spectroscopy. Electrochemical properties of these complexes revealed interesting behaviour in oxidation, and the formation of phenoxyl radicals within these compounds was evidenced by spectro-electrolysis.