Abstract

Bacteriochlorophyll c is a main pigment of green photosynthetic bacteria which is occurring in these organisms in various states of aggregation. Spectral properties such as absorption, fluorescence, delayed luminescence and photoacoustic spectra of bacteriochlorophyll c in two rigid matrices: silica glass and polymethylmethacrylate were established. The different photoproducts and aggregates of bacteriochlorophyll c exhibit various yields of thermal deactivation. Absorptions of some photoproducts are similar therefore the photoacoustic spectra are very useful in the investigations of the photochemical reactions. The pigments are more photochemically stable in silica glass than in polymer, which is due to the efficient quenching of triplet states in the silica glass.

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