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Photoacoustic spectroscopy has allowed to show that physisorbed Co II TPP is groundstate monooxidized into (Co III TPP) +  when adsorbed on Nb 2 O 5 , TiO 2 , SrTiO 3 , ZnO,SnO 2 . A double oxidation is observed when the porphyrin is adsorbed on WO 3 . Onthe contrary when it is adsorbed on ZrO 2  and SiO 2 , oxidation only occurs if theporphyrin has been driven by irradiation in its excited state. It remains in the reducedform when adsorbed on Ta 2 O 5 . This behavior has been correlated with the bandpositions of these various oxides and has allowed to roughly position the oxidationpotential of CoTPP in adsorbed state ∼0.8 V higher than in solution (0.5 V/SCE or5.3 V/vacuum) that is 4.5 V/vacuum.

Redox Properties of Cobalt Tetraphenyl Porphyrin Adsorbed on Semi-Conductor Oxides Studied by Photoacoustic Spectroscopy