Abstract

Chlorophyll a (Chl a) in pure non-polar solvents (e.g. dodecane) interacts via its polar groups and forms dimers¹⁾. These aggregates are considered model systems for the study of the primary processes in the photosystem II (P 680)¹⁾. Minute nucleophilic traces change the kinetic balance towards solvated monomers. The dimer absorption consists of two redshifted peaks, that of the (nucleophilic) acceptor molecule at 663 nm and that of the donor molecule at 678 nm. This indicates, that the π electron systems of the two molecules are not coupled.

© 1984 Optical Society of America