Hydrogen Peroxide in Artificial Photosynthesizing Systems
From the point of view of the concepts of hydrogen peroxide as a source of photosynthetic oxygen (hydrogen) coordination and photochemical properties of chlorophyll and its aggregates towards hydrogen peroxide were considered. The binding energy of H <sub>2</sub>O and H <sub>2</sub>O <sub>2</sub> with chlorophyll and chlorophyllide depending on their form (monomers, dimers and trimers) was estimated by quantum chemical calculations. It is shown that at an increase of the degree of the pigment aggregation binding energy of H <sub>2</sub>O <sub>2</sub> was more than the energy of H <sub>2</sub>O. Analysis of experimental results of the photochemical decomposition of hydrogen peroxide using chlorophyll was carried out. Estimates of the thermodynamic parameters (D G ° and D Н °) of the formation of organiс compounds from CO <sub>2</sub> with water and hydrogen peroxide were compared. The interaction of CO <sub>2</sub> with H <sub>2</sub>O <sub>2</sub> requires much less energy сonsumption than with water for all considered cases. The formation of organic products (formaldehyde, alcohols, carboxylic and carbonylic compounds) and simultaneous production of O <sub>2</sub> under the influence of visible light in the systems of inorganic carbon - hydrogen peroxide - chlorophyll (phthalocyanine) is detected by G C/M S method, FTIR spectroscopy, and chemical analysis.