Redox Properties of Cobalt Tetraphenyl Porphyrin Adsorbed on Semi‐Conductor Oxides Studied by Photoacoustic Spectroscopy | Zendy

A.M. Merle | Zendy; Linda Joy Brzezinski | Zendy; Abdelouahed Cherqaoui | Zendy; C. Giannotti | Zendy

Open Access

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

Author(s) -

A.M. Merle,

Linda Joy Brzezinski,

Abdelouahed Cherqaoui,

C. Giannotti

Publication year - 1983

Publication title -

laser chemistry

Language(s) - English

Resource type - Journals

eISSN - 1026-8014

pISSN - 0278-6273

DOI - 10.1155/lc.3.293

Subject(s) - chemistry , porphyrin , cobalt , photochemistry , adsorption , redox , spectroscopy , excited state , photoacoustic spectroscopy , inorganic chemistry , infrared spectroscopy , organic chemistry , physics , quantum mechanics , nuclear physics

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.

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