LIGHT ENERGY-CONVERSION WITH PHEOPHYTIN-A MONOLAYER AT THE SNO2 OPTICALLY TRANSPARENT ELECTRODE

The photoelectrochemical, absorption and fluorescence properties of ph eophytin a mono- and multilayers, deposited on optically transparent t in oxide electrodes and quartz slides were investigated. Spectra of ph otocurrents coincided with the absorption spectra of photosynthetic pi gment in monolayers at the SnO2/solution interfaces. The anodic and ca thodic photocurrents were measured at various electrode potentials. Ef fects of pH, electrode potentials, and concentration of redox reagents on the conversion of solar energy in monolayers on optically transpar ent electrodes are discussed The absorption and fluorescence spectral characteristics, and fluorescence lifetime measurements of pheophytin a in monolayers and thin films are also discussed in view of the aggre gation properties of the photosynthetic pigment. The thermodynamics of adsorption of large amphiphilic compounds at the interface between tw o immiscible liquids is considered. The adsorption behavior of pheophy tin a dissolved in different solvents is investigated. The thermodynam ic parameters of pheophytin a adsorption at octane/water and benzene/w ater interfaces were determined.