Abstract
Absorption and fluorescence data of 3,3'-diethyloxadicarbocyanine iodide (DODCI) bound with phospholipid liposomes with different polar head groups were analyzed. The lipid-bound dye was found to be a mixture of monomers and non-fluorescent H-aggregates (including dimers). Also, the amounts of each form were dependent on the lipid species and on the lipid/dye molar ratio. Highly efficient aggregation was observed in the presence of negatively charged liposomes composed of phosphatidylserine and phosphatidylinositol-4,5-diphosphate. The aggregation was followed by strong fluorescence quenching of the monomeric form present in the system, which was interpreted as a result of non-radiative excitation energy transfer from the dye monomers to the aggregates. Double exponential decay functions were found for the emission of the lipid-bound dye.
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