Shunsuke Meshitsuka

Electrocatalysis by metal phthalocyanines in the reduction of carbon dioxide

It is shown that cobalt and nickel phthalocyanines are active catalysts for the electrode reduction of carbon dioxide.

Photoelectrocatalysis by metal phthalocyanine evaporated films in the oxidation of oxalate ion

The photoelectrode process of metal phthalocyanine electrodes was studied in the reaction of hole capture by oxalate ions. The photo-response was explained by assuming that the charge carriers decay in a bimolecular recombination and that the electrochemical reaction rate is proportional to the number of charge carriers. The dependence of the photo-action upon the wavelength of the radiating light was related to the absorption spectra of the metal phthalocyanine.

Spectral distributions of photo-electrochemical reactions over metal phthalocyanine electrodes

The spectral distributions of photo-electrochemical currents over cobalt, nickel and copper phthalocynanines were measured in the region 340 to 800 nm. Two distinctive spectra were obtained for each metal phthalocyanine, depending upon the type of the reaction; as an electron was donated from or accepted by the phthalocyanines. In the former case the peak maximum was observed at the shoulder of the Q band in the absorption spectra and in the latter case it was observed at the peak of the Q band. The difference in the photoaction was assumed to be due to the difference in the efficiency of conversion from the excited states to the charge carriers. This assumption was also supported by the fact that the photo-action spectrum for the oxidation was altered by the phase transition from α to β-phase in which the structure of the Q band changed.

Infrared spectra and lattice vibrations of alkali and alkaline—earth metal sulfates

Abstract Infrared spectra from 4000 to 30 cm −1 of Li 2 SO 4 , K 2 SO 4 , Rb 2 SO 4 , Cs 2 SO 4 , BeSO 4 , MgSO 4 and CaSO 4 were measured. Infrared bands due to librational motions of sulfate ions were observed below 200 cm −1 in all the sulfates. The selection rules derived from site group analyses were found to be applicable to librational modes even when internal vibrations of sulfate ions did not observably reflect site symmetry effects. The influence of the nature of metal ions on internal vibrations of sulfate ions as well as lattice vibrations was examined.

Reversible oxygen uptake and catalytic oxidation by electrochemically reduced sulphonated cobalt phthalocyanine

Reversible oxygen uptake was observed in the electrochemically reduced di-negative anions of cobalt tetrasulphonate phthalocyanine (CoPcTs2–) by visible and e.s.r. spectra; oxygen activated by the reduced CoPcTs in the reversible oxygen uptake system was used for catalytic oxidation of polyhydric phenols.