[Regularities of aggregation and excitation electronic energy transfer in associates of pheophytin and its mesoderivatives].

The spectral-luminescent characteristics of mesoderivatives of pheophytin and its analogs were investigated in binar mixtures of solvents (ethanol--water; dioxane--water). The mesoderivatives were shown not to form stable longwave selfassociates. Under similar conditions the pheophytin mesoderivatives were inclined to the formation of stable mixed associates with pigments, containing vinyl groups and free keto groups in position 9. In mixed pigment associates the intracomplex excitation energy transfer discovered had an efficiency essentially lower than in mixed associates of chlorophyll and its analogs.