CHARACTERIZATION OF IRON TETRAARYLPORPHYRINS COORDINATIVELY BOUND TO SOLID SUPPORTS

Iron(III) tetra(pentafluorophenyl)- and tetra(2,6-dichlorophenyl)-porp hyrin (FeTPFPP and FeTDCPP) has-e been co-ordinatively bound to imidaz ole and pyridine groups on organic polymers (PSIm and PVP) and on the surface of silica (SiIm and SiPy). The oxidation and spin states of th e resulting supported catalysts have been characterised by UV-VIS, res onance Raman and EPR spectroscopy. Evidence is presented that the iron porphyrins on the flexible organic polymers are all low-spin bis-liga ted iron(II) species. In contrast,on the rigid modified silicas the ir on porphyrins are mono-ligated and high spin. Furthermore whereas FeTD CPP on SiIm is an iron(III) species, on SiPy it is iron(II) and FeTPFP P on SiIm is a mixture of both oxidation states.