[Highly reactive intermediates in photochemistry of chlorophyll].

It is shown that chlorophyll (Chl) has photochemical activity in the reduction of O2 to H2O2. In the case of the monomeric forms of Chl, H2O2 formation occurs with the participation of 1O2, OH and O2-. Activity of Chl depends on its microenvironment, and pH of the system. Associated forms of Chl do not photosensitize 102 formation, but are active in transfer of electrons to oxygen, that leads to H2O2 generation. Also it is found that Chl associates are able to act as electron donors to reduce H2PO4- and subsequently form hydrogen atom.