Hybrid structures of polycationic aluminum phthalocyanines and quantum dots

Biochemistry. Biokhimii︠a︡
E G MaksimovV Z Paschenko

Abstract

Semiconductor nanocrystals (CdSe/ZnS quantum dots, QDs) were used as inorganic focusing antenna, allowing for the enhancement of fluorescence and photosensitizing activity of polycationic aluminum phthalocyanines (PCs). It was found that QDs form stable complexes with PCs in aqueous solutions due to electrostatic interactions. In such hybrid complexes, we observed highly efficient nonradiative energy transfer from QD to PC, leading to a sharp increase in the effective absorption cross section of PC in the absorption bands of the CdSe/ZnS quantum dots. When hybrid complexes are excited within these bands, the intensity of PC fluorescence and the rate of photosensitized singlet oxygen generation increases significantly (up to 500 and 350%, correspondingly) compared to free PC at the same concentration. The observed effect is of interest for modeling primary stages of photosynthesis and increasing photosensitizing activity of dyes used in photodynamic therapy.

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Citations

Sep 25, 2017·Photomedicine and Laser Surgery·Heidi AbrahamseAjay Mishra
Feb 11, 2016·The Biochemical Journal·Heidi Abrahamse, Michael R Hamblin
Feb 19, 2017·Photosynthesis Research·Marcus MoldenhauerThomas Friedrich
Nov 23, 2018·Biochimica Et Biophysica Acta. Bioenergetics·Konstantin E KlementievAndrew B Rubin

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