In this work, we present a steady-state spectroscopic study on the formation of a non-covalent complex between commercially available CdSe / ZnS quantum dots (QD) and different porphyrin-type anionic photosensitizers. The QD surface was coated with lipid-based molecules containing terminal carboxyl groups. Porphyrins with an amphiphilic structure, such as chlorin e_6, carboxyphenyl and sulphonatophenyl porphyrins with one polar group, were found to form a stable complex with QD with the ability of energy transfer from QD to bound porphyrin molecules. The efficiency of energy transfer from QD to amphiphilic porphyrins was 11–14%. Upon binding to QD, a slightly more efficient energy transfer and well expressed spectral changes were observed for carboxyl- (Ce6, TC1PP) than for sulphonate-porphyrins (TS1PP). In the presence of QD, no significant spectral changes and only a negligible energy transfer (1–2%) were obtained for porphyrins with four polar groups. Based on our findings, we suggest that the formation of a QD-porphyrin complex occurs due to the hydrophobic interaction between the non-polar moiety of amphiphilic porphyrins and the hydrophobic part of the lipid-based QD coating.

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