The construction and utilization of a simple light‐transparent FTIR spectroelectrochemical cell with thin‐layer chamber

Abstract

Abstract The construction and utilization of a simple light‐transparent NaCl thin‐layer FTIR spectroelectrochemical cell for transparency measurements is reported. This cell has a 0.25‐mm optical pathlength and a three‐electrode configuration. The application of this cell for in situ FTIR measurements is demonstrated for the electrooxidation of (OEP)lr(CO)Cl, (TPP)Co(NO), and (TPP)Fe(NO) (where OEP and TPP are the dianions of octaethyl‐ and tetraphenylporphyrin, respectively) in methylene chloride solutions containing 0.1 M tetrabutylammonium perchlorate (TBAP). Under these solution conditions, spectral changes of the investigated compounds can be monitored between 2500 and 800 cm −1 . Well‐defined thin‐layer cyclic voltammograms of these investigated complexes and diagnostic IR absorption peaks for bound CO and NO as well as for porphyrin π cation radicals are obtained in CH 2 Cl 2 solutions containing 0.1 M TBAP. These in situ generated data are compared with literature IR data for chemically oxidized metalloporphyrins in the solid state.